478 Messrs. S. 0. Eidley and A. Dendy on 



Hymeniacidon ? siihacerata, n. sp. 



Massive, consisting of irregularly anastomosing trabeculae. 

 Pale yellow, with a waxy translucent look. Rather brittle. 

 Surface uneven, subglabrous. Main skeleton an irregular re- 

 ticulation ; at the surface a thin sheet of spicules, also densely 

 and irregularly reticulate, supporting numerous small outwardly- 

 projecting spicules. Spicules : — (1) smooth fusiform acuates, 

 somewhat curved, apex finely and gradually sharp-pointed, base 

 tapering, but evenly rounded off, size 1*2 by '031 millim. ; (2) 

 straight, gradually sharp-pointed, smooth acuates or subspinu- 

 lates, size '2 by '0063 millim., base not constricted. 



Locality. Station 208, Philippine Islands, 18 fath. 



Genus Phakellia (Bowerbank). 



Typically flabellate or cup-shaped. Skeleton somewhat 

 reticulate. Spicules acuate and often acerate. 



Pliahellia jlabellataj n. sp. 



Erect, stipitate, a short stem surmounted by a broad flat- 

 tened lamella, §■ inch thick. Greyish yellow, soft. One sur- 

 face ribbed and furrowed, without oscula, the other compara- 

 tively smooth, bearing numerous stellate groups of minute 

 oscula. Skeleton of stout ascending ribs, between which a 

 rather irregular reticulation of spicules, with meshes of smaller 

 spicules at the surface. Spicules : — (1) smooth, slightly 

 curved, gradually sharp-pointed acuates, size '5 by '03 

 millim. ; (2) smooth, straight acuates or subspiuulates, rather 

 abruptly sharp-pointed, size "22 by '0063 millim. 



Locality. Port Jackson, 30-35 fath. 



Phahellia papyracea, n. sp. 



Very thin, lamelliform (? cup-shaped), minutely punctate on 

 both surfaces ; thickness yV i'^ch. Yellow or brown ; fragile. 

 Very minutely hispid. Skeleton reticulate, rather rugose. 

 Spicules : — (1) smooth, sharp-pointed acuates, size "7 by '02 

 millim. ; (2) smooth, sharp-pointed acuates or subspiuulates, 

 size variable (e. g. '35 by '0063 millim.). 



Localities. Station 145 A and Station 148, Southern Ocean, 

 310 and 210 fath. 



Genus CiOCALYPTA (Bowerbank). 

 Skeleton of very definite columns of spiculo-fibre radia- 



