of British Hydroid Zoophytes, 859 



1 propose calling C. Johnstoni), but on account of its usually 

 inhabiting deeper water, it is not so generally met with. They 

 may, however, be occasionally found mixed together on the same 

 zoophyte, particularly on the stem of Plumularia falcata ; but 

 when their peculiar characters are known, they can readily be 

 distinguished from each other. C. volubilis, as here distin- 

 guished, is scarcely more than half the size of C. Johnstoni, and 

 has the cells usually narrower and more cylindrical, with the 

 crenations of the margins blunter and shallower. But the best 

 distinguishing character is in the pedicle, which in this species 

 is always spirally twisted throughout, though becoming less 

 marked towards the top, where a single spherule supports the 

 cup. The creeping stem is generally, but not always, twisted 

 when attached ; but when, as is often the case, it becomes free, 

 its spirally twisted character is beautifully displayed, and it has 

 the appearance of a minute transparent cord, with a club-shaped 

 termination. The pedicles and cells arising from the free part 

 of the stem are always shorter than where it is attached, and 

 more nearly resemble Ellis's figure. The ovicapsules are oblong 

 flask-shaped, smooth, compressed laterally and produced into a 

 very long and narrow neck ; they arise from the creeping stem 

 by a short pedicle of two whorls. 



Campanularia Johnstoni, PI. XIII. fig. 8. 



Camp, volubilis, Johnst. Brit. Zooph. 107, woodcut 18; Couch, Cornish 

 Fauna, 40. t. 2. f. 1 ; Gosse, Ramb. Dev. Coast, 296. t. 18. 



Stem creeping, plain; pedicles long, with numerous close-set 

 rings at the base, and more or less ringed at the top; the 

 middle part usually plain; cells deep and rather large, with 

 ten or twelve strong denticles round the rim : ovicapsules 

 nearly sessile on the creeping stem, ovate oblong, strongly 

 plicated transversely and truncated at top. 



Height li- tenth. 



On sea-weeds, zoophytes, and shells, from between tide-marks 

 to deep water : common. 



This species is of more robust growth than the last, with the 

 cells larger and more strongly denticulated ; they are also wider, 

 but this character is rather variable in both species. The pedicles 

 are longer and stouter, and have always numerous close- set rings 

 at the base, and also several rings at the top : the middle part is 

 variable, sometimes partially or even wholly ringed, but more 

 frequently plain*. The creeping fibre is always plain, and 



* It is important in this genus to distinguish between rings and spiral 

 ridges. 



