HYDROID FAUNA OF THE BERMUDAS. 247 



tions at the ends of the pedicel, the tubular hydrotheca, and the con- 

 siderable variation in the height of the pedicel, together seem sufficient 

 to place the Bermuda specimen in this species. 



Genus Clytia. 



Clytia bicophora Agassiz. 



Agassiz, L., 1862, p. 304, pi. 29, figs. 6-9. 

 Nutting, 1901, p. 343, fig. 21. 

 Nutting, 1915, p. 56, pi. 12, figs. 1-3. 



Fraser and many other writers consider Clytia hicophora identical 

 witli C. johnsioni (Alder). Nutting, with some hesitation, regards it as 

 a separate species, on the basis of the following points: 1) the tenuity 

 of the hydro thecal wall; 2) the smaller size of the hydrotheca; 3) the 

 presence of a simple instead of a complex diaphragm. IMy specimens 

 of C. hicophora, found growing on Pcimaria from Cow-Ground Flat, 

 have hydrothecae which are distinctly smaller than those of C. john- 

 sioni, and show many cases of the collapsed hydrothecal wall. They 

 also have only 12 marginal teeth, and there are annulations in the middle 

 of the pedicels, which are sometimes annulated throughout. None of 

 my specimens of C. johnstoni show these features, and I have found no 

 stages intermediate between the two; this seems sufficient to establish 

 C. bicophora as a separate species. 



Clytia cylindrica Agassiz. 



Agassiz, L., 1862, p. 306, pi. 27, figs. 8, 9. 

 Nutting, 1901, p. 342. 

 Fraser, 1912, p. 358, fig. 16. 

 Nutting, 1915, p. 58, pi. 12, figs. 6, 7. 



A few colonies were found on Sargassum at Agar's Island, and on 

 floating Sargassum oft' the north shore. 



Clytia fragilis C'ongdon. 



Congdon, 1907, p. 471, fig. 13. 

 Nutting, 1915, p. 62, pi. 15, fig. 1. 



A number of colonies, 10-12 mm. high, were found on Sargassum 

 at Somerset Bridge. The gonosome was absent, but the trophosome is 

 quite characteristic in this species. 



k 



