CHAKACTERISTIC DEEP-SEA TYPES. SPONGES. 



173 



perforated, and the sculpture is arranged radially with some 

 degree of regularity. 



The EuplecteUidse (known principally as Venus's Basket, from 

 the Philippine Islands) are represented in the West Indian region 

 by huge species, and by peculiar types adapted to a rocky bot- 

 tom, such as ReyadeUa phoenix (Fig. 524), while the typical 

 EuplectellaB seem to have flourished best in ooze. Euplectella 

 Jovis (Fig. 525) must have been at least 48 centimetres in length. 



Hyalonema 8'iebold'd (Fig. 526), a cosmopolitan species, was 



..,, 

 ill 



ii* t V*. 



j- ii -, r.>5- 



Fig. 526. Hyalonema Sieboklii. |. 



also found near Grenada in 

 416 fathoms. The Japanese 

 long deceived naturalists re- 

 garding a species of Hyalo- 

 nema representing the bun- 

 dle of siliceous spicules as 

 the axis of a Gorgfonia-like 



O 



animal. (Fig. 527.) Leidy 



Fig. 527. Spicules of Japanese Hyalo- 

 nema with encrusting polyps. J. 



