| OCR Text |
Show 1886.] POSITION AND CLASSIFICATION OF SPONGES. 569 Kingdom ANIMALIA. I. Subkingdom PROTOZOA. Animals which are either unicellular, or, if multicellular, isocellular, without archenteron. II. Subkingdom METAZOA. Multicellular, heterocellular animals with archenteron. I. Grade COELENTERA. Metazoa with simple body-cavity. i. Phylum M E S O D E R M ALIA. Coelentera with branching canal-system, and organs developed from cells of the mesogloea or primary mesoderm. No movable appendages. 1. Class SPONGI.E. With the characters of the phylum. ii. Phylum E P I T H E L A R I A. Coelentera with csecal canal-system. The organs are developed from cells of the epithelia. With movable appendages. 1. Group POLYPOMEDUS^E. Polypoid Epithelaria with cnidoblasts. i. Series Aphacella. PolypomedusBe without entodermal phacellee. 2. Class HYDROMEDUS.E. Aphacellse of polypoid and medusoid character. Medusae cycloneur. ii. Series Ph ac ell o t a?. Polypomedusse with entodermal phacellae. 3. Class ACTINIARIA. Polypoid Phacellotse with funnel and septa. 4. Class SCYPHOMEDUSiE. Medusoid Phacellotse developed direct or from a Scyphostoma by strobilation. Toponeur. II. Group CTENOPHORA. Epithelaria with paddle-rows without cnidoblasts. Centroneur. 5. Class CTENOPHORA. With the characters of the group. II. Grade CCELOMATA. Metazoa with distinct gastral and ccelomic cavities. |
