94 1',1,'ITISH TUNICATA. 



pectinated or not, though the transverse ribs are con- 

 spicuous enough. The tentacular filaments of the 

 branchial tube are nearly equal in size, rather short, 

 and are widely separated from each other ; only twelve 

 were counted; but the specimen was probably im- 

 perfect in this respect. 



The ovary is placed in the intestinal loop, and 

 appears at the left side as a lobulated structure ; a 

 few lobules are also seen at the right side. The male 

 cfeca are probably quite minute, they are not observed 

 at the surface, apparently being buried amidst the 

 cellular matter, a thin coating of which is spread over 

 the alimentary canal. 



Var. carnosa var. nov. (PI. V, figs. 7-11.) 



A rosy flesh coloured variety of this species occurred, 

 which may perhaps be specifically distinct ; but if so 

 colour alone will have to characterise it ; for we cannot 

 find any other feature of importance to distinguish it. 

 The tentacular filaments, however, are more numerous, 

 there being in the flesh-coloured variety about forty ; 

 while we have seen that the dark specimen examined 

 has only twelve ; but it is quite possible that, in this 

 instance, some of them may have been removed, or that 

 the specimen itself in respect to the tentacular filaments 

 is abnormal. 



IRELAND. Birterbuy Bay, Connemara (Brai 



8. Ascidia plana Hancock. 



(PL VI; PI. XVII, fig. 6; PL XIX, fig. 5; PL XX, 

 fig. 6 ; and fig. 10 in text.) 



[A*ci<U j ilana HANCOCK in Ann. Nat. Hist. (4) VI (1870), 

 p. 355.] 



Both/ ovate, pellucid, yellowish horn-coloured, smooth, 

 except at the orifices, which are tuberculated ; attached 

 by the lower half. Apertures not much produced ; the 

 branchial subterminal, the anal about half-way down. 

 Test firm, rather thick, cartilaginous, smooth, hyaline, 



