524 CRUSTACEA. 



FAMILY CERAURID^E. Ceraurus, Sphserocoryphe, Sphserexochus. 



FAMILY CONOCOKYPHID^E. Bailiella, Chariocephalus, Conocoryphe, Harttia, 



Menocephalus, Prototypus. 

 FAMILY CYPHASPID^E. Cyphaspis. 



FAMILY DICELLOCEPHALID^E. Dicellocephalus, Pterocephalia, Ptychaspis. 

 FAMILY ENCRINURID^E. Amphion, Eucrinurus. 

 FAMILY ELLIPSOCEPH ALID.E. Ellipsocephalus. 

 FAMILY HARPID^E. Harpes. 

 FAMILY; ILL JENIDJE. Illsenurus,Illsenus. 

 FAMILY LICHID^E. Lichas, Terataspis. 

 FAMILY OLENID^E. Dolichometopus, Oryctocephalus, Telephus, Triarthrella, 



Triarthrus. 

 FAMILY PARADOXID^E. Anopolenus, Atops, Bathynotus, Elliptocephala, 



Mesonacis, Olenoides, Paradoxides. 

 FAMILY PHACOPID^E. Dalmanites, Phacops. 

 FAMILY PROETID^E. Harpides,.Phsethonides, Phillipsia, Proetus. 

 FAMILY PTYCHOPARIDJE. Agraulus, Crepicephalus, Liostracus, Longocephalus, 



Loganellus, Ptychoparia, Solenopleura. 

 FAMILY REMOPLEURID^E. Remopleurides. 



FAMILY TRINUCLEID^E. Ampyx, Dionide, Eudymiouia, Trinucleus. 

 FAMILY AFFINITY UNCERTAIN. Pemphigaspis. 

 TRACKS SUPPOSED TO BE CRUSTACEAN. Asaphoidichnus, Cliruachtichnites, 



Diplichnites, Protichnites, Rusichnites. 



SUBCLASS XIPHOSURA. 



ORDER AMPHIPELTIDA. 

 FAMILY AMPHIPELTID.E. Amphipeltis. 



ORDER EURYPTERIDA. 



FAMILY ECHINOGNATHID^:. Echinognathus. 



FAMILY EURYPTERIDA. Anthraconectes, Dolichopterus, Eurypterella, Euryp- 



terus, Pterygotus, StyJonurus. 

 FAMILY HEMIASPID^:. Bunodella. 



ORDER XIPHOSURA 



FAMILY BELINURID^E. Belinurus, Euproops, Protoliinulus 

 FAMILY CYCLID^E. Cyclus, Dipeltis. 



SUBCLASS EDRIOPTHALMATA. 



ORDER AMPHIPODA. 

 FAMILY DIPLOSTYLID^:. Diplostylus. 



ORDER ANISOPODA. 

 FAMILY ACANTHOTELSONID^E. Acanthotelson. 



