Fig. 11. 
I. ZOOPHYTA HYDROIDA. 
FAMILY I. HYDRAIDiE. 
1. Hydra, # Linnaeus. 
Character. — Polypes locomotive , single , nakedly gelatinous , 
sub-cylindrical , but very contractile and mutable inform , the mouth 
encircled with a single series of granulous filiform tentacula . 
1. H. viridis, grass-green ; body cylindrical or insensibly 
narrowed downwards ; tentacula 6 — 10 , shorter than the body . 
Woodcut, No. 4, page 37. 
Polypes verds, Trembley, Mem. 22, pi. 1, fig. 1 ; pi. 3, fig. 1—10 
Fresh-water Polypus, Trembley, in Phil. Trans. Abridg. viii. 623. Folkes , 
in ibid. 676. pi. 17, and pi. 18, fig. 1 — 3 Hydra viridis. Lin. 
Faun. Suec. 367, No. 1283. Lin. Syst. 1320. Mull. Verm. I. ii. 13. 
Zool. Dan. prod. 230, No. 2783. Berk. Syn. i. 221. Tire's Rutherg. 232. 
Turt. Gmel. iv. 691. Turt. Br. Faun. 218. Lam. Anim. s. Vert. ii. 60. 
Stew. Elem. ii. 452. pi. 12, fig. 4, 5. Blumenbach's Man. 275. pi. 1. 
fig. 10. Bose , Vers ii. 274. Stark , Elem. ii. 443. Woodward in Mag. 
Nat. Hist. iii. 349, fig. 89. Roget, Bridgew. Treat, i. 162, fig. 59, and 
176 — 8, fig. 73 — 76. Adams on the Microscope, 399, pi. 21, fig. 5. 
* C, T Jga — properly “ a water serpent,” but the name has been appropriated to 
the monster of Lake Lerna, fabled to have 50 or 100 heads, of which no sooner 
was one of them cut off, than two sprouted out in its place. From this property 
Linnaeus was obviously led to apply the name to the animalcules in question. 
