CXIV 



DIV. IV\ — RADIATA. 



ORDER II. — Hydrostatica. 



This order is distinguished by air vesicles or bladders, by which 

 the animals are usually suspended in the water. 



Genus. 

 Physalia, Lam. 



Physsophora, Forsk. 



Diphyes, Ciii\ 



Subgenus. Example of Species. 

 Holothuiia pliysalis, L. 



1. Physsophora, prop. .P. hydrostatica, Gm. 



2. Hippopus, Quoy Sf G. 



3. Cupulites. 



4. Raceniides, Cut'. 



5. Rhyzophyza, Per.. P. fillifoni)is, Forsk. 

 Stephanomia S. aniphltritis, Per. 



Diphyes, prop. 



Calpe. 



Abyle. 



Cuboides. 



Navicula, 



See An. de Sc. X, 



