290 MOLLUSCOIDA. 



tentacles around the mouth. This order has been divided into five suborders, viz.: 

 Chilostomata, Cryptostomata, Trepostoinata, Cyclostomata, and Ctenostomata. The 

 families which we recognize are as follows : 



Family AcANTHO<;LADiDiE. — Acanthocladia, Diplopora, Glauconome, Ichthy- 



orachis, Ptilopora, Ramipora, Septopora, Synocladia. 

 Family Amplexoporid.*. — Amplexopora, Atactopora, Discotrypa, Leptotrypa, 



Petalotrypa. 

 Family Arthrostylid^c. — Arthroclema, Arthrostylus, Helopora, Nematopora, 



Nematoporella, Sceptropora. 

 Family Ascodictyonid.*. — Ascodictyou, Rhopalonaria. 

 Family Batost<>mi:i,i,ii>.e. — Anisotrypa, Batostoma (?), Batostomella, Leio- 



clema, Peronopora. 

 Family Botrylloporid,e. — Botryllopora. 

 Family BvrHOPORiDiE. — Bythopora. 

 Family Ckramoporida:. — Aspidopora, Ceramella, Ceramopora, Ceramoporella, 



Chiloporella, Crepipora, Eridopora, Glossotrypa, Idiotrypa, Lichenalia, 



Lichenotrypa, Odontotrypa, Petigopora, Phractopora, Pileotrypa, Sage- 



nella, Selenopora, Spatiopora. 

 Family Crihinkllid.e. — Crisinella. 



Family Enalloporid.e. — Diploclema, Kuallopora, Protocrisina. 

 Family Fenem i i.i.id.k. — Archimedes, Clathropora, Cosciuella, Coscinium, 



Coscinotrypa, Evactinopora, Fenestella, Fenestralia, Fenestrapora, Hclico- 



pora, Hemitrypa, Isotrypa, Loculipora, Lyropora, Phyllopora, Polypora, 



Ptilopora, Ptiloporella, Ptiloporina, Reptaria, Reteporiua, Semicosciniuin, 



Semiopora, Tectulipora, Unitrypa. 

 Family Fistuliporid.e. — Actinotrypa, Buscopora, Callopora, Calloporella, 



Callotrypa, Chilotrypa, Coelocaulis, Eridopora, Favicella, Fistulipora, 



Lichenotrypa, Pinacotrypa, Selenopora, Strotopora. 

 Famil y Heliotrypidje. — Heliotrypa. 

 Family Lahk< •hiid.e. — Labechia. 

 Family Palescharid.e. — Paleschara. 

 Family Phaceloporid.e. — Phacelopora. 

 Family Ptilodm tyomd.k. — Cosciuella, Cyclopora, Cycloporella, Escharopora, 



Graptodictya, Heterodictya, Phamopora, Proutella, Ptilodictya, Ptilotrypa, 



Streblotrypa, Worthenopora. 

 Family Rhabdomesontiile. — Acanthoclema, Anisotrypa, Bactropora, Ccelo- 



conus, Nemataxis, Rhombopora, Tropidoj)oni. 

 Family Rhinoporid.e. — Rhinopora. 

 Family Sphragioporid,e. — Sphragiopora. 

 Family Stictoporllve. — Acrogenia, Arthropora, Cystodictya, Dichotrypa, 



Dicranopora, Eurodictya, Euspilopora, Goniotrypa, Heliotrypa, Intra- 



pora, Pachydictya, Phractopora, Phyllodictya, Prismopora, Rhinidictya, 



Scalaripora, Stictopora, Stictoporella, Stictoporina, Stictotrypa, Sulcopora, 



Taeniodictya, Tseniopora, Thamnotrypa. 

 Family Subretiporidje. — Chainodictyon, Drymotrypa, Subretepora. 

 Family Thamniscid^e. — Criscinella, Diplopora, Thamniscus. 



