

CLASSIFICATIONS OF ZOOPHYTES. 455 



6 I. Cells in pairs, attached by the back, the orifices with 

 opposite aspects. 



Notamia. 

 a a. Cells single. 

 Eucratia. 

 Anguinaria. 



A A. Sheath membranaceous, cells enlarged externally and lateral. 

 SERTULARIAD.E. 



I. Base of the cells broad, coalescing with the stem. 



. Cells on opposite sides of the stem. 

 Sertularia. 

 Dynamena. 

 Thuiaria. 

 a a. Cells unilateral. 



Antennularia. 



Plumularia. 



Serialaria. 



II. Base of the cells narrow, or pedunculated. 



Campanularia. 

 Valkeria. 

 Cjmodocia. 



A A A. Sheath membranaceous ; the cells are the simple extremities of 

 the branches. TUBULAEIAD^!. 

 Tubularia. 

 Plumatella. 



IV. NUDA. 



POLYPI NAKED, THE MOUTH WITH MARGINAL TENTACULA. 



Coryna. 

 Hydra. 



Latreille''s method may next be noticed. He, following La- 

 marck, divides the animal kingdom into three primary sections, 

 the last of which is denominated ACEPHALA, which, with various 

 other classes, includes all the Zoophyta. The Actinia and Lu- 

 cernaria constitute a distinct class Helianthoida which is 

 placed between the sea-stars (Echinodermata), and sea-jellies, 

 (Acalepha), being superior to the latter and to zoophytes by 

 their organization, in which Spix had detected a nervous system. 

 The Polypes follow the sea-jellies, and are subdivided thus : 



