358 Mr. J. Alder on some new genera and species 



ing in segments as in Campanularia syringa, but here the seg- 

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

 S. rugosa has a similar operculum. The ovicapsules, for a know- 

 ledge of which I am indebted to the Rev. T. Hincks, scarcely 

 differ from those of S. polyzonias and /S. rugosa, but are perhaps 

 a little more produced at the top. The polypes appear to be 

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

 which the creeping fibre throws up only single cells on short 

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

 taken for a Campa7iularia. 



Family Campanulariadse. 



Campanularia volubilis. PI. XIII. fig. 7. 



Sertularia volubilis, Linn. Syst. Nat. 12th ed. 1311 ; EUis, Brit. Corall. 24. 

 t. 14. f. a A. 



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

 rally spirally twisted ; pedicles rather longish, spirally twisted, 

 and not ringed at the base; a single spherical ring below 

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

 ten shallow blunt denticles round the margin : ovicapsules 

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

 shaped, smooth, with a long narrow neck. 



Height about y^Qth inch. 



On Plumularia falcata, 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 Linnsean appellation properly belongs. Unfortu- 

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

 quotes the excellent 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 spirally 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 peculiar form of which will, I think, 

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

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



