CLASSIFICATION. 75 



distinguished by a very remarkable dissimilarity of organi- 

 zation. These classes have been named ANTHOZOA and 

 POLYZOA, and may shortly characterized thus : 

 Class I. ANTHOZOA. Body tending to globular, contractile 

 in every part, symmetrical : mouth and vent one : gem- 

 miparous, and oviparous. 



Class II. POLYZOA. Body elongate, syphonal, non-contrac- 

 tile, and unsymmetrical : mouth and anus separate : 

 oviparous. 



Class ANTHOZOA, Ehrenberg. 

 The Anthozoa are divisible into the following orders : 



I. HYDEOIDA. Polypes compound, rarely single and naked ; 



the mouth encircled with roughish filiform tentacula ; 

 stomach without proper parietes ; intestine ; anus ; 

 reproductive gemmules pullulating from the body and 

 naked, or contained in external vesicles. Polypidoms 

 horny, fistular, more or less phytoidal, external. 



II. ASTEROIDA. Polypes compound, the mouth encircled 



with eight fringed tentacula; stomach membranous, 

 with dependent intestinal appendages; intestine 0; 

 anus ; ovules produced interiorly. Polype-mass vari- 

 able in form, free or permanently attached, carnose, 



