CHARACTERISTIC DEEP-SEA TYPES. — SPONGES. 173 
perforated, and the sculpture is arranged radially with some 
degree of regularity. 
The Euplectellide (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 Regadella phonia (Fig. 524), while the typical 
Euplectelle seem to have flourished best in ooze. vuplectella 
Jovis (Fig. 525) must have been at least 48 centimetres in length. 
Hyalonema Sieboldii (Fig. 526), a cosmopolitan species, was 
Fig. 526. — Hyalonema Sieboldii. $. 
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 Gorgonia-like Fig. 527. — Spicules of Japanese Hyalo- 
animal. (Fig. 527.) Leidy nema with encrusting polyps. $. 
