Hydra. Z. IIYDHOIDA. 97 



Syn. i, •2-21. Turt. Gmel. iv. 991. Blumcnb. Man. 275. Turt. Brit. 

 Faun. 218. Stew. Elem. ii. 452. Lam. Anim. s. Vert. ii. 60. Bosc, 



Vers, ii. 275. L'H. brune, Blainv. Actinol. 495. 



Hab. Still waters in England, rare. In a pond at Hackney, Mr 

 John Ellicot.* 



" The tails of these are long-, slender, and transparent, and when 

 placed before the microscope, a long- straight gut may plainly be dis- 

 tinguished passing from the body-part or stomach to an opening at 

 the end thereof. These are rather lighter coloured than the former, 

 (H. vulgaris,) and have seldom more than six or eight arms, but 

 those capable of great extension." — Baker. 



Baker reckoned that his English exemplars were of a soi*t diffe- 

 rent from those he had received from M. Trembley, but the only ap- 

 parent difference lies in the greater shortness of the tentacula of the 

 former, and this is a character liable to considerable variation, and in- 

 sufficient of itself for specific distinction. The species has been 

 beautifully illustrated in Trembley's " Memoires," by the pencil and 

 graver of the celebrated Lyonet, for it is an interesting fact that all 

 the figures, and most of the plates, which adorn the admirable book 

 just mentioned, were drawn and etched by the author of the " Traite 

 anatomique de la chenille du saule,"f and are indeed among the very 

 earliest specimens of his extraordinary attainments in these arts. 



It may be worth while to call attention to the remarkable resem- 

 blance of the Hydra fusca to the Cucullanus cirratus of MuUer, 

 Zool. Dan. tab. 38, fig. 1-7, which is an intestinal worm ! 



4. H. VERRUCOSA, pale cinereous ; body pedunculate, cam- 

 paniform ; tentacula longer than the hody. 



Hydra verrucosa, Templeton, in Mag. Nat. Hist. ix. 418, fig. 57. 



Hab. Still waters, " In the pond at Cranmore (near Belfast,) 

 Sept. 1812," J. Templeton, Esq. 



" Of a pale cinereous hue, with six verrucated tentacula, of mode- 

 rate length, and nearly equal thickness." " This species, when at 



rest, assumes more of a campanulate form than any other species of 

 the genus, except lutea and the following. The warts are not uni- 

 formly diffused, as in pallens ; nor do the tentacula diminish much in 

 size towards the tips." — Templeton. 



* Elected F. R. S. Oct. 26, 1738; and the author of several papers on sub- 

 jects in Natural Philosophy, published in the Phil. Trans, between the years 

 1745 and 1750. He was a watchmaker, and died in 1772. 



t " Ouvrage qui est a la fois le chef-d'oeuvre de 1 'anatomic et celui de la gra- 

 vure." — Cuvier. 



G 



