Demeter (Ch 14)

Etymology and Epithets:
     (g.) Demeter, De "wheat" + meter "mother" = Goddess of the Grain
     (l.) Ceres
Domain: Dry earth, fertility goddess.
Genealogy: Cronus + Rhea, Sister of Zeus, Mother of Persephone (a.k.a. Proserpina)
Claim to Fame: Indicter of Elusian Mystery Cult, original scorned mother.
Iconography: sheaves of wheat, pillbox hat, snakes or snakelike things.
Literature: Homeric Hymn to Demeter

Myths

I. Rape of Persephone: Hades abducts Persephone from Demeter (witnessed only by Hecate, but in accordance with Zeus) and drags her down to the underworld. In response, Demeter undergoes 9 days of fasting and non-bathing while she looks high and low for her daughter.
She arrives at Eleusis, disguised as an old woman, seeking refuge at Celeus and Metaneira's palace (Rulers of Eleusis). To deal with her grievances, she offers to nurse the royal couples son, Demophoon, while an attendant Iambe cheers her up. She breaks her fast only with a draught of water, barley meal, and mint.
In attempt to immortalize Demophoon, she burns away his mortal parts in a holy fire at night, then feeds him on nectar and ambrosia during the day. She is caught by Metaneira, however, who thinks she is abusing the child, until Demeter casts off her mortal guise and appears to the family in full glory.
She demands a temple be built in her honor, with an altar, cult-following, and specific rites. Demophoon remains mortal, but is revered for his divine childhood.
Demeter moves on and withdraws from the gods and mankind. The ensuing famine plagues the land, starving mankind and diminishing worshippers, so Zeus sends all deities to win her over. Inconsolable, Demeter demands Persephone's return. Hades obliges at first, but offers his wife pomegranate seeds before her departure (bloody fruit, seeds = symbol of sexual consummation, loss of virtue), thus she is not returned in the same state that she was taken in. As a result, Persephone can only spend 2/3 of the year with her mother and the Olympians, and must remain 1/3 of the year with her husband Hades.
Demeter restores fertility to the land, and promotes her mystery cult.

Interpretation

Allegorical: Hades (earth) + Persephone (seed) = sowing of seeds, seemingly dead things, to bring life when it revisits the surface.
Structural: Cycle of reincarnation present in mother/daughter relationship. Earth mother and dying loved one is revisited each cycle.
Ritualist: Rite of passage for young girl to be married by father (Zeus) to a man often twice her age. Prearranged marriage of Parthenos ("virgin"), deflowered by her berothed. Eating pomegranate symbolizes first menses, the ability to bear children.

II. Eleusian Mystery Cult: To maintain fertility of the earth, Demeter invokes a number of rites of worship to appease her. With the promise of a secret initiation, happy afterlife, and several annual processions, she installs Triptolemus, the Elusian prince,  as her sanctioned messenger to pass on her knowledge of agriculture.
     - Myo "to squint", mystai "squinters"/"initiates"
     - Hierophant, "revealer of sacred things", initiates newcomers at the Telesterion ("hall of initiation")
     - 9 days of fasting, drinking only Kykeon ("barley meal, mint, and water"), torch procession, jest
     - 3 Stages of initiation:
           1. Lesser Mysteries: springtime procession
           2. Greater Mysteries: fall procession
           3. Epopteia ("beholding"): acknowledgement of the Hierophant, obscure unknown ritual.

Poseidon (Ch 7)

Etymology and Epithets:
     (g.) Poseidon, Posis "husband" + don... da "of Da" (ie. Consort of Earth mother), or Posis "to drink"
     (l.) Neptune
     "Earth Shaker", "Earth Holder"
     Potamos ("river"), associated with the I.E. God of Freshwater, who attains domain over salt water
     as they migrated to the coast.
     Hippios, "horsey" another I.E. association with riding-cultures. Horses drowned in his honor.
Domain: The sea. Tectonic plates.
Genealogy: Cronus + Rhea. Brother of Zeus.
Claim to Fame: God of the sea, horse riding, earthquakes, irregular temperaments.
Iconography: trident, waves, fish, horses, ships
Literature: Ovid's Metamorphosis

Myth

I. Poseidon Erechtheum ("original soil"): Despite losing the contest for patronage for Athens (See Athena), Poseidon is appeased by the citizens (in fear or appreciation, we'll never know) and a temple is built in his honor on the grounds of the Parthanon. The Erechtheum is characterized by its Carytid statues, beautiful women holding various items of symbolic significance, which serve the same function as columns.

II. Hippios and Demeter: In Arcadia it was rumored that Poseidon pursued his own sister, Demeter, who sought to escape him by disguising herself as a mare. Poseidon transformed into a stallion, and the magical steed Arion is born.
Similar origins for the mythological creature Pegasus as well, as Poseidon entered another tryst with Medusa to the same outcome.

III. Amphitrite: Poseidon took Amphitrite as his wife and had a son Triton. While daddy acts up to bring storms to sink ships, Triton blows his conch shell to calm the seas.
Amphitrite herself works hard to keep her marriage monogamous, and Poseidon is kept on a short leash.
Scylla (daughter of Phorcys), an object of Poseidon's desire is transformed into a monster whose lower half is ringed by dogs. She flees to the straits of Messina, where her and Charybdis (daughter of Poseidon and Gaia), a vicious whirlpool that spews three times a day, work to make sailors lives miserable.

IV. Odysseus: See Odysseus for details on Poseidon's pursuit of this wily hero.