190 ROYAL SOCIETY OF CANADA 



H"-. Oa). (2) A^eiy numerous, small, slender, bluntly pointed, spined 

 tjdostjii, i>;enerally slightly bent near the base, Avith small but well 

 marked heads (Plate I., tig-. 96) ; from 0-203 to 065 mm. in length 

 îAid 0-003 to 004 mm. in thickness (Fristedt, 0-12 mm. long). These 

 sjjioules occur in great abundance in the cortex. (6) Microsclera. — (1) 

 Anisochelff>, feAv in number (Plate I., tigs. 9r, OtZ) ; average length 

 0052 mm. (Fristedt, 006 mm. long). (2) Slender sigmata, simple and 

 contort (Plate T., tigs. 9t', 9/) ; average length 0-019 mm. (Fristedt, 

 0'02 mm. long). 



Until more specimens of this sponge shall have been obtained which 

 show the entii'e shape, it is thought advisable to refer the specimen 

 collected by Mr. Whiteaves provisionally to Fristedt's species. 



Locality. — Between Anticosti and the Gaspé peninsula, in 200 fathoms, 

 one specimen, dry, J. F. Whiteaves, 1873. Fristedt's Greenland specimen 

 was dredged in 130 fathoms. 



Desmacikon (Homœodictva) palmata, Johnston. 

 (Plate II., %s. 1, Irt— /.) 



Halichondria palmata, Johnston. 1842. Britisli Sponges, p. 92, pi. ii., figs. 1, 2, 3, 



4, 5. 

 Isodictya jjalmala, Bowerbank. 1866. Mon. Brit. Siiong., vol. ii., p. oil and vol. iii., 



p. 133, pi. Hi., figs. 1-7. 

 Chaiina ])almata. Carter. 1882. Ann. and Mjig. Nat. Hist., series 5, vol. x., p. 109. 

 Desmacidon (Homœodicftja / palmata, 1887. Ridley and Dendy. Rep.'Monaxonida, 



Zool. Chall. Exp., vol. xx.. p. 108. 



This seems to be a common sponge on the Atlantic coast and is 

 represented in the collection by a number of specimens, none of which 

 have attained a greater height than l\h inches. They resemble in gen- 

 eral appearance the specimen figured by Johnston more than they do 

 the (jne represented by Bowerbank. In a number of cases they are 

 attached to valves of Jlodiola modiolus, L., and one or two specimens 

 have grown on small )iebl)U's. 



Spicules. — ('<) Mctjasclcra ; oxea, varying in length from 0-124 ta 

 0-222 mm. and in thickness, from 0-003 to 0013 mm. (Plate II., fig. la). 

 (6) Microscler<( ; palmate isochela', with an average length of 0-029 mm. 

 (Plate II., ligs. le, Id, \e, If). In nearly all the specimens examined a 

 few styli are present, but they occur only in very small numbers (Plate 

 lI.,fig.l/>). 



Localities. — Xova Scotia, one specimen, and Sable Island, one speci- 

 men, flabellate in form, dry, Sir "William Dawson ; Five Islands, Minas 

 Basin, Bay of p\indy, twent}^ specimens and a number of fragments, 

 dry, C. w!! Willimott, 1892. 



Distribution. — Nova Scotia ; noi-fheast coast of United Slates 

 (Verrill). 



