MARINE] SPONGES OP BRITISH COLUMBIA, ETC. 7S 



of 0163 mm., has eight rays ; (c) small, rough discohexacts (Plate VI, fig. 31), with an 

 average diameter of 0052 mm., whose principal rays sometimes bear long, straight ter- 

 minals ; (d) slender, rough discohexasters (Plate VI, figs. 8m, 3n), varying in diameter 

 from 0052 to 0045 mm. with tw^o or three slightly bent terminals. Simple, rather bluntly 

 pointed diacts occur. These are rough, becoming almost spinose at each end and bear 

 four central tubercles or inflations (Plate VI, fig, 3p). 



I have named this interesting species after Mr. J. F. Whiteaves, at whose suggestion 

 the critical examination of these sponges was undertaken. 



Locality. — Strait of Greorgia near Comox, Vancouver Island, ten miles south-east of 

 Hornby Island, in forty fathoms, one specimen (figured) and a few fragments. 



B.— Species collected in 1891 in Behring Sea. ' 



MONAXONIDA. 



Halichondria panicea, Johnston. 



(Plate IV, figs. 3, 4, 5 and Plate V, figs. 9, 9a, 10, 10a, 11, 11a). 



1. — A large, massive, rugose form (Plate IV, fig. 3) with a rather cavernous structure ; 

 size of spicules (Plate V, figs. 9, 9a) varying from 0-65*7 by 02 mm. to 0-209 by 0-013 

 mm. Length of the only specimen collected 102 mm., breadth 92 mm., height 80 mm. 



Locality.— kika. Island, Aleutian Islands, lat. 52° 20' N., long. 1*74', 30' "W. 



2. — A compact form with an even surface and rather dense skeletal structure (Plate 

 IV, fig. 4); spicules ranging in size from 0-412 by 0013 mm. to 0176 by 0009 mm. 

 (Plate V, figs. 10, 10a.) The sponge has a length of 65 mm., a breadth of 55 mm., and a 

 height of 40 mm. One specimen. 



Locality.- kiksi Island, Aleutian Islands, lat. 52° 20' N., long. 174' 30' W. 



3. — A variety represented by a large specimen (Plate IV, fig. 5), very dense in 

 structure with spiciiles A'arying in size from 0-726 by 002 mm. to 0117 by 0-004 mm. 

 (Plate V, figs. 11, 11a). One specimen, very much worn ; length 125 mm., breadth 70 

 mm., thickness 35 mm. 



Locality.— ^t. Matthew Island, Behring Sea, lat. 60" 30' N., long. 172° 80' "W. 



Reniera rufescens. (Sp. nov.) 



(Plate IV, fig. 6 and Plate V, figs. 12, 12a.) 



Sponge (Plate IV, fig. 6) very irregular in form, consisting of variously lobate or 

 short, stout, subramose expansions which frequently coalesce, in some specimens so much 

 so as to become almost massive. Represented in the collection by five specimens and a 

 number of fragments. One of the specimens is encrusting a valve of Tapes staminea, 

 Conrad, and two others have grown round fragments of Corallitia officinalis, L. The sub- 



' All the specimens referred to under this heading were collected on the beach. 



