SYNOPTICAL CLASSIFICATION of the CHEILOSTOMATA. 



Class POLYZOA. 



Order II. GYMNOL^MATA. 



Sub-Order I. CHEILOSTOMATA. 



§ I. ARTICULATA. Polyzoarium divided into distinct internodes by flexible joints. 

 §§ I. Unicellclakes. Internodes formed of a single cell. 



Fam. 1. CATENICELLIB/E, Busk, Brit. M. Cat., part i, p. .3. 



* Cell at each division of the branches geminate. 



1. Catenicella. 



** Cell at each division single. 



2. Alysidium. 



3. Chlidonia. 



*** Cells bi-trilocular, 



4. Calpidium. 



**** Cells forming the stem and primary branches slender and tubular, without a mouth. 



5. EUCRATEA. 



§§ 2. MuLTiCELLTJLARES. Intemodes multicellular. 



A. Cells disposed in the same plane. 



Fam. 2. CELLULARIID^. 

 [a) Inarmata. Neither avicularia nor vibracula. 



6. Cellularia. 



(6) ArmatcB. With avicularia or vibracula, or with both, 

 a. With avicularia and vibracula. 



7. SCRUPOCELLARIA. 



(i. With avicularia only. 



8. Menipea. 



9. Emma. 



