42 P rocecdings of the Royal Society of Victoria. 



Microsckrcs, (a) robust tridentate isochela^, with strongly- 

 curved shaft and short blunt teeth. These spicules vary up to 

 about 0'04 mm. in length. What I take to be young forms are 

 extremely abundant. The smallest ai^e very slender and the 

 developing teeth gives them a peculiar appeai-ance ; (^) rather 

 slender, simple and contort sigraata ; measuring when fully 

 grown about 0"033 nnn. from bend to bend. Both forms of 

 microscleres are very abundant. 



This specices appears to be nearly related to P. ciTspiiosa, but is 

 distinguished by the thin habit, the more robust chelae and the 

 presence of abundant sigmata. 

 R.N. 1047 (x B). 



Phinwlialichondria gravida., n. sp. 



Massi\e, compact, solid. Intensely and coarsely sandy. Sand 

 arranged in stout vertical columns endinfj in slight conuli on 

 the curface. Surface subglabrous between the sandy points. 

 Vents rather large, scattered, wnth wide, vertical oscular tubes. 

 Texture hard, friable. Colour in spirit sandy brown, with grey 

 flesh. 



Skeleton, composed chiefly of sand, with numerous spined styli 

 echinating the sand grains, and other spicules scattered between. 

 At the surface the oxea form radiating tufts. 



Megascleres, (a) straight, smooth, slender oxea, rather abruptly 

 pointed ; about 044 by 0-0027 mm. ; (/') short, slender, straight, 

 finely pointed and entirely spined styli ; about 0'06 by 0*004 mm. 



Microscleres, (a) tridentate isocheUe, up to about 0"023 mm. 

 long, Ijut commonly much smaller ; (/') rather slender, simple and 

 contort sigmata, about 0'03 mm. from bend io bend. 



P.N. 71G (.s. 8); 881 (s. 9). 



Plumohalicliondria iucrustans. Carter, sp. 



EcJiinonema incrustaus, Cai-ter, A.M.N.H., November, 1885, 

 p. 353. 



Plumohalicliondria viaiivuillata, Carter, A.M.X.H., November, 

 1885, p. 355. 



Phniwhalichondria inannnillata, Ridley and Dendy, Challenger 

 Monaxonida, p. l.")G, pi. xxx., Hgs. 4, 4(7 ; pi. .\lvii., figs. 4, 4^. 



