130 HISTORY OF BRITISH ZOOPHYTES. 
Hab. Entrance to Dublin Harbour, Ellis; Belfast Lough, 
Templeton; Ballycastle, Dr. J. L. Drummond; Howth, 
Mr. R. Ball; Portmarnock, Mr. W. Thompson ; near Aber- 
deen, Dr. Skene; Frith of Forth, Dr. Coldstream; Scar- 
borough very rare, Mr. Bean; Bootle, Mr. Tudor ; Corn- 
wall, Mr. Couch; Devon and Norfolk, very rare indeed, 
Mr. C. W. Peach. 
“ Tts ramifications are irregular, but chiefly alternate; its 
texture is of a thin, transparent, horny nature ; the denticles 
or cells are large, cylimdrical, open and opposite, and each 
pair seems fixed in the top of the next pair below it. The 
vesicles appear to be shaped lke a heart, with a short tube 
at the top, not unlike the aorta, cut off.” (H/iis.) It bears 
some resemblance to 8. 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 Mr. 
Tudor, and also.from D. L., junior, got in the Frith of 
Forth. 
13. SERTULARIA ABIETINA, Sea-fir Coralline. (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 
