290 MOLLUSCOIDA. 



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

 Chilostomata, Cryptostoraata, Trepostomata, Cyclostomata, and Ctenostomata. The 

 families which we recognize are as follows : 



FAMILY ACANTHOCLADID.*:. Acanthocladia, Diplopora, Glauconome, Ichthy- 



orachis, Ptilopora, Ramipora, Septopora, Synocladia. 

 FAMILY AMPLEXOPORIDJE. Amplexopora, Atactopora, Discotrypa, Leptotrypa, 



Petalotrypa. 

 FAMILY ARTHROSTYLIDJK. Arthroclema, Arthrostylus, Helopora, Nematopora, 



Nematoporella, Sceptropora. 



FAMILY ASCODICTYONID^E. Ascodictyou, Rhopalonaria. 

 FAMILY BATOSTOMELLIDA Anisotrypa, Batostoma (?), Batostomella, Leio- 



clema, Peronopora. 



FAMILY BOTRYLLOPORID^E. Bo try llopora. 

 FAMILY BYTHOPORID^. Bythopora. 

 FAMILY CERAMOPORID^E. Aspidopora, Ceramella, Ceramopora, Ceramoporella, 



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



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



nella, Selenopora, Spatiopora. 

 FAMILY CRISINELLID^E. Crisinella. 



FAMILY ENALLOPORID^E. Diploclema, Enallopora, Protocrisina. 

 FAMILY FENESTELLID^E. Archimedes, Clathropora, Coscinella, Coscinium, 



Coscinotrypa, Evactinopora, Fenestella, Fenestralia, Fenestrapora, Helico- 



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



Ptilopora, Ptiloporella, Ptiloporina, Reptaria, Reteporina, Semicoscinium, 



Semiopora, Tectulipora, Uuitrypa. 

 FAMILY FISTULIPORID^. Actinotrypa, Buscopora, Callopora, Calloporella, 



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



Lichenotrypa, Pinacotrypa, Selenopora, Strotopora. 

 FAMILY HEIJOTRYPIDJE. Heliotrypa. 

 FAMILY LABECHIID^E. Labech ia. 

 FAMILY PALESCHARID^E. Paleschara. 

 FAMILY PHACELOPORIDJE. Phacelopora. 

 FAMILY PTILODICTYONIDJE. Coscinella, Cyclopora, Cycloporella, Escharopora, 



Graptodictya, Heterodictya, Phaenopora, Proutella, Ptilodictya, Ptilotrypa, 



Streblotrypa, Worthenopora. 

 FAMILY RHABDOMESONTIDA:. Acanthoclema, Anisotrypa, Bactropora, Coelo- 



conus, Nemataxis, Rhombopora, Tropidoj>ora. 

 FAMILY RHIN OPORTO.*;. Rhinopora. 

 FAMILY SPHRAGIOPORID^;. Sphragiopora. 

 FAMILY STICTOPORID^E. Acrogenia, Arthropora, Cystodictya, Dichotrypa, 



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



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



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



Tseniodictya, Tseniopora, Tharanotrypa. 



FAMILY SUBRETIPORID^C. Chainodictyon, Drymotrypa, Subretepora. 

 FAMILY THAMNISCID*:. Criscinella, Diplopora, Thamniscus. 



