ANIMALIA RADIATA. 145 



ORDER II. HYDROSTATICA. 



One or more bladders filled with air, and destined to sup- 

 port the animal in the midst of the fluid ; very numerous ap- 

 pendages, some of which act as suckers, others as tentacula; 

 no apparent mouth. 



POLYPI. 



Body cylindrical or conical, often without other viscera 

 than its cavity; often, likewise, with a visible stomach, to 

 which intestines adhere, or rather vessels excavated in the 

 substance of the body ; a single orifice surrounded by tenta- 

 cula, and making these animals resemble the Octopus ; pro- 

 duction of new individuals by buds and by eggs. Two re- 

 markable orders. 



ORDER I. CARNOSI. 



Body fleshy, contractile and without any solid matter ex- 

 ternal or internal; inferior extremity in form of a disk, serving 

 to keep them stationary, sometimes aiding them to creep, and 

 even susceptible of being detached, so as to permit them to 

 swim ; mouth surrounded by tentacula, resembling, in their 

 expansion, the petals of a flower. Such are the Actiniae or 

 Sea Anemonies. 



