Fig. 11. 



I. ZOOPHYTA HYDROIDA. 



FAMILY I. HYDRAIDiE. 



1. Hydra,* Linnaeus. 



Character. — Polypes locomotive, single, naked, gelatinous, 

 sub-cylindrical, hut 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 



narroived downwards ; tentacula 6 — 10, shorter than the body. 



Woodcut, No. 4, page 37. 



Polyi)es verds, Trembley, Mem. 22, pi. 1, fig. 1 ; pi. 3, fig. 1 — 10 



Fresh-water Polypus, Trembley, in Phil. Trans. Abridg. viii. 623. Folhes, 



in ibid. 676. pi. 17, and pi. 18, fig. 1 — 3 Hydra viridis. Lin. 



Faun. Suee. 367, No. 1283. Lin. Syst. 1320. Mull. Verm. I. ii. 13. 

 Zool. Dan. prod. 230, No. 2783. Berk. Syn. i. 221. Ure's Rutberg. 232. 

 Turt. Gmel. iv. 691. Turt. Br. Faun. 218. Lam. Anim. s. Vert. ii. 60. 

 Steio. Elem. ii. 452. pi. 12, fig. 4, 5. Blumenhach's Man. 275. pi. 1 . 

 fig. 10. Base, 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. 



* "TtTga — 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. 



