HALICHONDRIA. 107 



scribed and figured by Carter, is from a little north- 

 west of Shetland, in 345 fathoms, and thus in deeper 

 water though in the same region from which the type 

 specimens were sent to Dr. Bowerbank. 



24. HALICJHONDRIA CORRUGATA, Sow., 11, 242 ; in, PL 

 XLIII, figs. 16. 



1867 Biemma corrugata, Gray. Proc. Zool. Soc., p. 539. 



Habitat. Westport Bay, Mayo ( 



25. HALICHONDRIA FALCULA, Bow., in, 208, PI. LXXIY, 



figs. 13. 



1868 Halichondria falcula, Bowerbank. Last Report of 

 Dredging among the Shetland Isles; Norman on 

 Porifera, Brit. Assoc. Rep., p. 332. 



I have found a second and much finer specimen of 

 this species in my collection. It is from the same 

 locality as the type, which it closely resembles in 

 every particular, but is of larger size, measuring two 

 and a half inches long, one and three quarters wide, 

 and nearly an inch and a half thick. 



26. HALICHONDRIA FLABELLIFERA, Bow. } n. sp., iv, PI. VII, 



figs. 410. 



" Sponge massive, parasitical. Surface smooth, but 

 minutely hispid externally. Defensive spicula very 

 numerous, scarcely projecting through the dermis, 

 fusiformi-acuate, basally and occasionally apically 

 spinous ; spines few in number, acutely conical. 

 Dermal membrane pellucid, abundantly spiculous ; 



