130 HISTORY OF BRITISH ZOOPHYTES. 



Hab. Entrance to Dublin Harbour, Ellis ; Belfast Lougli, 

 Templeton; Ballycastle, Dr. J. L. Drummond; Howth, 

 Mr. li. Ball ; Portmarnock, Mr. W. Thompson ; near Aber- 

 deen, Dr. Skene; Frith of Eorth, Dr. Coldstream; Scar- 

 borough very rare, Mr. Bean ; Bootle, Mr. Tudor ; Corn- 

 wall, Mr. Couch ; Devon and Xorfolk, very rare indeed, 

 Mr. C. W. Peach. 



" Its ramifications are irregular, but chiefly alternate ; its 

 texture is of a thin, transparent, horny nature ; the denticles 

 or cells are large, cylindrical, open and opposite, and each 

 pair seems fixed in the top of the next pair below it. The 

 vesicles appear to be shaped like a heart, with a short tube 

 at the top, not unlike the aorta, cut ott?' {Ellis.) It bears 

 some resemblance to S. rosacea, but it is of a much more 

 robust habit. I have not observed it on the Ayrshire coast, 

 but I have fine specimens of it from my liberal friend ^Ir. 

 Tudor, and also from D. L., junior, got in the Erith of 

 Forth. 



13. Sertularia abietina. Sea-fir CoralUne. (Plate V. 

 fig. 14.) 



Hab. On shells and stones in deep water, common. It 

 is not common, however, on the coast of Ayrshire. We 

 have occasionally picked up a specimen, having, however, a 



