32 BEITISH SPONGIAD^. 



Dr. Bowerbank gave h.is reasons for not recognising 

 tliat genus. Let otters decide the matter. This is 

 not the occasion to defend my own views, but I may 

 be allowed to observe that my description was not 

 based on a single specimen, as my old friend seems to 

 imply. I certainly have seen a far larger number of 

 specimens, and those, too, fresh from the sea, than 

 ever passed in a dried condition through his hands. 



5. Polymastia spinula. Bow., ii, 66; iii, 27; PL XI, 



figs. 10—13. 



Habitat.— Dredged in Birterbuy Bay, Connemara, 



1874 (N.). 



6. Polymastia eadiosa, Bow., ii, 68; in, 28; PI. XI, 



figs. 14—18. 



7. Polymastia mammillaeis (Muller). 



1861 JEvfpleetella ma/mmila/ris, Bow, Liat Brit. Marine Invert. 



(Brit. Assoc), p. 71. 

 1867 Penoilla/rid mam/millaris, Gray. Proc. Zool. Soc, p. 627. 



Habitat. — 'Polperro, Cornwall ; three miles off Dun- 

 stanborough, Northumberland ; the Minch ; Birterbuy 

 Bay, Connemara (N.). 



Among the specimens from the last-named locality 

 is one of an oval form, and a little more than an 

 inch in length, embedded in a mass of Baphyrus 

 Oriffithsice, which completely covers, inside and out, 

 the gibbous valve of a Pecten maximus. Another fine 

 large example from the same dredgings is about three 



