CX1V 
D1V. 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. Subgenus. Example of Species. 
Physalia, Lam , 
Physsophora, Forsk. 
' Holothuria physalis, L. 
1. Physsophora, prop .. P. hydrostatica, Gm. 
2. Hippopus, Quoy 8f G. 
3. Cupulites. 
4. Racemides, Cuv. 
5. Rhyzophyza, Per.. P. filliformis, Forsk. 
6. Stephanomia S. amphitritis, Per. 
r 1. Diphyes, prop. ^ 
2. Calpe. 
Diphyes, Cuv . S 3. Abyle. /See An. de Sc. X. 
1 J 4. Cuboides. 
1 5. Navicula. J 
