Hydra_The Water Serpent

Hydra: Resting at 16.40 to 30.00 Cancer it's symbol is the serpent."Gives wisdom and riches,and resists poisons.
Hydra info taken from "The Fixed Stars and Constellations in Astrology by Vivian E.Robson,B.Sc.

"Hydra is the largest modern constellation, at 1303 square degrees. Despite its size, Hydra contains only one reasonably bright star, Alphard (α Hya, 30 Hya), which is of apparent magnitude 1.98. Alphard ("the solitary one") is actually a double star. The head of the snake corresponds to the Āshleshā nakshatra, the lunar zodiacal constellation in Indian astronomy."Taken from Wikipedia"