472 Messrs. S. 0. Ridley and A. Dandy on 



milliin. ; (4) biharaates, usually much contort, size "063 by 

 •0045 millira. 



Locality. Station 320, oflf the Rio de la Plata, 600 fath. 



Myxilla hastata^ n. sj?. 



Lamellar, about ^ inch thick. Soft and spongy. Skeleton 

 confused. Spicules: — (1) stout, gradually sharp-pointed, 

 smooth acuates, size "77 by "04 millim. ; (2) smooth hastately- 

 pointed cylindricals, size "35 by '01 millim. ; (3) tridentate 

 equianchorate, with stout and strongly curved shaft, length 

 up to '04 millim. (more commonly '025) ; (4) bihamates, 

 often much contort, size '07 by "004 millim. 



Locality. Station 320, off the Rio de la Plata, 600 fath. 



Myxilla crihrigera^ n. sp. 



Digitate. Dark yellowish grey. Soft and spongy. Mi- 

 nutely hispid. Oscula small, scattered. Pores in definite 

 rounded areas, diameter of areas I'O millim., of pores '1 

 millim. Skeleton confused. Spicules: — (1) stout, smooth 

 acuates, size '65 by "025 millim. ; (2) bicapitate cylindricals, 

 with oval heads, sometimes minutely spined at the end, size 

 •3 by '008 millim. ; (3) large tridentate equianchorates, with 

 slightly curved shaft, laterally expanded towards each end, 

 length "08 millim. 



Locality. Station 306 A, off south-west coast of Patagonia, 

 345 fath. 



Myxilla fusca^ n. sp. 



Massive, amorphous. Rather dark brown. Texture fairly 

 firm and elastic. Sometimes minutely hispid. Spicules : — 

 (1) entirely spined acuates, sharp-pointed, size '52 by '034 

 millim.* -, (2) bicapitate cylindricals, head faintly developed, 

 smooth, size '42 by '01 millim. ; (3) tridentate equianchorates, 

 with strongly curved shaft, teeth rather widely divergent, 

 length '047 millira. ; (4) very slender bihamates, usually 

 much contort, length '05 millim. 



Locality. Station 150, Southern Ocean, 150 fath. 



Myxilla mariana, n. sp. 



Massive. Pale yellowish grey. Fairly compact, but soft. 

 Main skeleton an ill-defined reticulation of spined acuates, 



* No distinctly echinating spicules seen, but sometimes entirely spined 

 acuates, much smaller than those described, occur. 



