122 ANTHOZOA HYDROIDA. 



colour to some particular food, such as weeds, &c. and tliat they 

 would lose it upon being kept to worms ; but I find myself mis- 

 taken, for they retain their greenness after some months as well as 

 ever, and are now grown of a moderate size, extending sometimes 

 three quarters of an inch ; their arms are also lengthened very 

 miich to what they were, and are of a lighter green than the body, 

 their number eight, nine, or ten. The tail is very little slenderer 

 than the body, but more spread at the end than the tails of other 

 kinds." Baker. 



Pallas says that the offspring are produced from every part of the 

 body ; while Blainville thinks he has remarked that they shoot always 

 from the same place, "au point de jonction de la partie creuse et de 

 celle qui ne Test pas." Blainville is candid enough, however, to in- 

 form us that Professor Van der Hoven had made some observations 

 adverse to his opinion ;* and our own are certainly in accordance 

 with those of Pallas and of the Professor of Leyden. 



Trembley is careful to tell us that he discovered this species in 

 June, 1740 ; nor can we smile at the particularity of the record when 

 we remember that the discovery is the foundation of his immortal 

 fame.t It was first observed in England in the spring of 1743 by 

 a Mr. Du Cane of Essex. It appears to be a hardy animal. I have 

 kept it for more than twelve months in a small vial of water un- 

 changed during the whole of that time, and it remained lively, and 

 bred freely ; feeding on the minute Entomostraca confined with it, 

 and which, propagating much more abundantly, furnished a good 

 supply of what was evidently a favourite food. 



2. H. VULGARIS, oranc/e-hrotvn or yellowish ; hody cylindri- 

 cal ; tentacula 7-12, as long or longer than the hody. 



Plate XXIX. Fig. 2. 



Polypes de la eeconde espece, Tremb. Mem. pi. 1, fig. 2, 5 ; pi. 2, fig. 2 ; pi. 6, fig. 2 

 and 8 ; pi. 8, fig. 1-7 ; pi. 10, fig. 1-7 ; pi. 11, 12, 13. figs. omn. partly copied in 

 Adams Micros. 399, pi. 21, fig. 6. Rosel Hist, der Insect, iii. Polyp, tab. 78 to 

 83. (In these plates the species is represented in many states, simple and proli- 

 ferous, and also in the act of seizing the little worms on which it preys.) Ehrc?ih. 

 Corall. des roth. Meer. 68. — Hydra vulgaris, Pall. Elench. 30. Ellis in Phil. 



* Bulletin des Sc. Nat. xvi. 337. 



t " Trembley (Abraliam), de Geneve, ne en 1710, mort en 1784 ; immortcl^&v le 

 decoiiverte de la reproduction du polype." Cuvier, Reg. Anim. iii. 422. — Blumen- 

 bach also informs us that his observations on this polype first led him to his ingenious 

 investigations on tlie Nisiat formativiis. 



