88 BIOLOGICAL SUKVEY OF 



Lambe has described from Vancouver Island a species, 

 H. disparalis, which has two sizes of spicules. In this species 

 the large oxea vary in length from .438 to 1.28 mm., whereas 

 the small ones average .091. The spicule length in these two 

 species overlap slightly, but the modal length is probably 

 different. As both H. disparalis and H. fibrosa rest upon a 

 single specimen each, further study may show that the limits 

 of variation will include both within the same species. This 

 seems probable, especially as Fristedt has recorded the occur- 

 rence in Behring Straits of Amorphina fibrosa, which Lund- 

 beck has shown belongs among the Halichondria. 



Geographical distribution. West Greenland (Lundbeck) ; 

 Mount Desert Region. 



EuMASTiA 0. Schmidt 

 EuMASTiA siTiENS 0. Schmidt 



Lambe (1896, p. 182, pi. 1, fig. 1); Lundbeck (1902, p. 31, 

 pi. 4, figs. 1-6 ; pi. 10, figs. 9-12). 



This species is very common throughout this region, being 

 as abundant as Halichondria panicea. It is one of the few 

 sponges which has a constant and characteristic form, and the 

 species has been described and illustrated in detail by Lund- 

 beck. 



Skeleton. The skeleton consists of loose indistinct fibers 

 as well as many scattered but closely packed spicules. 



Spicules. These are slender, slightly bent oxea which taper 

 gradually to a fine point and vary in length from .324 to .647 

 mm., with a mode of .486 mm. 



Geographical distribution. Davis Strait (Lundbeck) ; West 

 Greenland (Fristedt) ; Gulf of St. Lawrence and off southern 

 coast of Nova Scotia (Lambe) ; Mount Desert Region. 



Reniera Nardo 

 Reniera cinerea (Grant) 



Lundbeck (1902, p. 43, pi. 11, fig. 10). 



There is only one specimen of this species, taken at Station 

 40, on rock in 69 feet of water, which has been placed in this 

 species with some misgivings. 



