358 ^Ir. J. Alder on some netv genera and species 



ing in segmeuts as in Canipanularia si/rinya, but here the seg- 

 ments are fewer, corresponding: with the angles of the mouth. 

 <S. rugosa has a similar opercuhun. The ovica])sulcs, for a know- 

 led;;c of which 1 am iiulel)ted to the Hev. T. Ilincks, scarcely 

 differ from those of S. puhjzunias and S'. riic/osa, but are perhaps 

 a little more j)roduccd at the top. The polypes appear to be 

 yellow or orange-coloured. Specimens of S. tenella occur in 

 which the creeping tibre throws up only single cells on short 

 foot-stalks throughout its course. In this form it might be 

 taken for a Campanidaria. 



Family Campanulariadae. 



Campanularia volubilis. PI. XIII. fig. 7. 



Sertularia roliibilis, Linn. Svst. Xat. 12th ed. 1311 ; Ellis, Brit. Corall. 24. 

 t. 14.f. aA. 



Stem creeping, sometimes giving off shoots in a free state, gene- 

 rally spirally twisted ; pedicles rather longish, spirally twisted, 

 and not ringed at the base ; a single sj)lierical ring below 

 each cell ; cells generally rather narrow and deep, with about 

 ten shallow blunt denticles round the margin : ovica])sules 

 rising on short pedicles from the creeping stem, oblong flask- 

 shaped, smooth, with a long narrow neck. 



Height about y'^jth inch. 



On Plumidariafalcata, Sertularia fallax, and other zoophytes : 

 frequent. 



Three or four species have hitherto been confounded under 

 the name of Camp, volubilis. It therefore becomes necessary to 

 redescribe and discriminate them, and to ascertain, if possible, 

 to which the Linnwan appellation properly belongs. Unfortu- 

 nately the description of that author is very imperfect, but as he 

 quotes the e.xcellcnt figures of Ellis, with which his description, 

 as far as it goes, corresponds, these may be fairly taken as 

 representing the true C. volubilis. The distinguishing character 

 of the species there represented is the sj)irally twisted stem ; and 

 Ellis remarks in his description, that " at the bottom of each 

 [cup] , where they join the stalk, the microscope discovers to us a 

 very minute spherule or little ball, as in some drinking glasses.^' 

 With these characters the species here described perfectly agrees. 

 I have for some time been satisfied that this was distinct from 

 the C. volubilis of Johnston and other modern British authors, 

 but it was not until lately that I was so fortunate as to meet 

 with its ovicapsules, the j)eculiar form of which will, I think, 

 remove all doubt on the subject. This species is almost equally 

 common on our coast with that described bv Dr. Johnston (which 



