32 BRITISH SPONGIAD.E. 



Dr. Bowerbank gave his reasons for not recognising 

 that genus. Let others 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, Boiv., ii, 66; in, 27; PI. XI, 



figs. 1013. 



Habitat. Dredged, in Birterbuy Bay, Connemara, 



1874 (N.). 



6. POLYMASTIA RADIOSA, Sow., n, 68; in, 28; PI. XI, 



figs. 1418. 



7. POLYMASTIA MAMMILLAEIS (Midler). 



1861 Euplectella mammilaris, Bow. List Brit. Marine Invert. 



(Brit. Assoc.), p. 71. 

 1867 Pencillaria matmnittaris, Gray. Proc. Zool. Soc., p. 527. 



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 Rapliyrus 

 Griffith sice, which completely covers, inside and out, 

 the gibbous valve of a Pecten maximus. Another fine 

 large example from the same dredgings is about three 



