76 NATURAL HISTORY OF 



" A very elegant little hydroid, resembling T. hellis 

 in its mode of growth, but distiuguished by the 

 absence of distinct annulation, and by the smaller size 

 of the polypites/^ — Allman. 



A very beautiful plate, illustrative of T. hellis, T. 

 atteniiata, and T. humilis, is given in Prof. Allman's 

 " Gymnoblastic Hydroids/^ Plate XXII. 



Genus II. Ecto pleura, Agassiz. {€kt6<;, outside, 

 7r\€vp6<;, a rib.) 



Stems fistular, simple, or branched, rooted by a 

 filiform stolon, all enclosed in a polypary. Polypitea 

 flask-shaped, with tentacles as in last genus. Gono- 

 phores originating free medusae. — T. H. 



1. E. Dumortierii, Van Beneden. 



Tubularia Dumortierii (F. B., G. J., D. L., P. H. G.). 



Hab. : Point of Ayr, Isle of Man (T. K). Height 

 about ^ in. 



The only specimen found in Britain is that found by 

 the Rev. Mr.Hincks as above. The species was described 

 by Van Beneden {'' Mem. sur les Tubul.," 50) from 

 specimens obtained at Ostend, parasitic on Flustra, &c. 



Prof. Allman refers this species and genus to a family 

 Eyhdocoridce , as stated above in the remarks upon the 

 family characters of Tubidariidce. 



Genus III. Corymorpha, Sars. (Kopvvr], a club, 

 /j,op(f)7]^ form. 



Folyjnte solitary, borne on a simple stem, which 

 terminates in a conical base, and is invested by a 

 delicate membranous sheath. Distal tentacles in 

 several verticils close tog'ether. Proximal tentacles in 



