2 AET. 1. T. TJIMA : ITEXACTINELLIPA, III. 



tion into the system, viz., the Leucopsaeidœ and the Caulophacidse. 

 The former group is in part identical with that which I have 

 formerly regarded as a Eossellid subfamily under the name of 

 Leucopsacinee (Ijima '98, p. 41). The latter corresponds in a 

 large measure to F. E. Schulze's Asconematida^, which name 

 will have to be dropped out. Clrounds for the above rearrange- 

 ment will 1)6 enunciated in the propor ])laees. 



PLACOSOMA PARADICTYUM. N. c, n. sp. 



Pis. T. and II. 



This new genus and species are founded on a single specimen 

 obtained by Ki'Ma in Outside Okinose, Sagami Sea, from a depth 

 of between 274 and :M3 fathoms (501-572 m.). 



The sponge is excellently preserved in a dried state, except 

 for a rent across the body ; this, however, in no wise prevents 

 us from obtaining a correct conception of the shape. It has a 

 long stalk, which is attached to a brecciated tufaceous substratum 

 by a large, irregularly lobate, basal expansion. Total height of 

 the sponge, 210 mm. 



The sponge-body, though probably cup-like ^vhen young, can 

 scarcely be called so as it is, but may best be described as an 

 irregular, but transversely elongate and laterally compressed, cake- 

 like mass. It is of a light, soft and very delicate texture. A 

 light touch of the finger is liable to leave behind an impression 



