BRITISH ZOOPHYTES. 77 



a single series. Gonozooids sessile,* or on branched 

 peduncles borne at the base of the lower tentacles, free 

 and medusiforra. — T. H. 



This genus is one of the three genera of Hydroida 

 which have solitary polypites, the other two being 

 Hydra and Myrioihela. 



1. C. NUTANS, 8ars. Plate IV. fig. 1. 



Hab. : Orkneys {Forbes and Goodsir), Shetland 

 {Fo7-hes),Yowej (C. W. P. and Aid.), Isle of Man (Aid.), 

 Seaham Harbour, Durham {Hodge), Firth of Forth 

 {AIL). Height 2 — 4^ in. Polypite large, light red. 

 Distal tentacles about 80, arranged in several rows. 

 Proximal tentacles about 30, white and long. Poly- 

 pary replaced by a delicate pellicle. Gonozooids 

 " naked, borne in clusters at the extremities of 

 branched stalks.'^ 



The marginal bulbs of the gonozooid are without 

 tentacles, except one which bears a single very long 

 tentacle, clustered with thread cells. 



" When placed in a vessel of sea-water it presented 

 the appearance of a beautiful flower. Its head grace- 

 fully nodded (whence the appropriate specific appella- 

 tion given to it by Sars), bending the upper part of its 

 stem. It waved its long tentacula to and fro at 

 pleasure, but seemed to have no power of contracting 

 them. It could not by any means be called an apa- 

 thetic animal, and its beauty excited the admiration of 

 all who saw it.'^ — Forbes and Goodsir. 



The stem, as in Tubidaria, contains a number of canals 

 for the distribution of the nutrient fluid. These canals 

 give a lined appearance to the stem of this species. 



* By stating this double mode of growth, the necessity of 

 making a new genus for C. nana is obviated. 



