REPORT ON THE DEEP-SEA KERATOSA. 91 



Phylum II. SpongI/E (Porifera). 



Classes: 1. Malthospongise ; 2. Silicispongise ; 3. Calcispongise [or perhaps better, 

 1. Protospongise (Tubulosse) ; 2. Metaspongise (Vesiculosse)]. 



Phylum III. C n i d a r i a (Acalephse). 



Ill a. Subphylum 1. Hydrozoa. 

 Classes : 1. Hydropolypi ; 2. Hydromedusse (Craspedotse) ; 3. Siphonophorse. 



IIIb. Subphylum 2. Scyphozoa. 

 Classes: 4. Scyphopolypi ; 5. Anthozoa (Corolla); 6. Scyphomedusse (Acraspedse). 



Phylum IV. Platoda (Plathelminthes). 

 Classes: 1. Turbellaria ; 2. Trematoda; 3. Cestoda ; 4. Ctenophora (?). 



B. Second main branch of the Metazoa. 



Ccelomaria (Coslomata vel Bilateria). 



Phylum V. Helminthes (Vermes). 



Va. Subphylum 1. Archelminthes. 

 Classes: 1. Trochozoa ; 2. Rotatoria. 



Vb. Subphylum 2. Strong ylari a. 

 Classes : 3. Nematoda ; 4. Acanthocephala ; 5. Chastognathi. 



Vc. Subphylum 3. Rhynchoccela. 

 Classes : 6. Nemertina ; 7. Enteropneusta. 



Vd. Subphylum 4. Prosopygia. 

 Classes: 8. Bryozoa ; 9. Phoronida ; 10. Brachiopoda. 



Phylum VI. Mollusca. 



VI a. Subphylum 1. Cochlides. 

 Classes: 1. Placophora ; 2. Gastropoda; 3. Scaphopoda ; 4. Pteropoda. 



