524 CRUSTACEA. 



Family Ceraurid^e. — Ceraurus, Sphserocoryphe, Sphserexochus. 



Family Conocoryphida. — Bailiella, Chariocephalus, Conocoryphe, Harttia, 



Menocephalus, Prototypus. 

 Family Cyphaspida. — Cyphaspis. 



Family Dicellocephalid^e. — Dicellocephalus, Pterocephalia, Ptychaspis. 

 Family Encrinurida. — Araphion, Encrinurus. 

 Family Ellipsoceph alida. — Ellipsocephalus. 

 Family HarpidjE. — Harpes. 

 FAMiLYilLL^ENiDiE. — Rlamurus,Illa2nus. 

 Family Lichidje. — Lichas, Terataspis. 

 Family Olenidjk. — Dolichometopus, Oryctocephalus, Telephus, Triarthrella, 



Triarthrus. 

 Family Paradoxidje. — Anopolenus, Atops, Bathynotus, Elliptocephala, 



Mesonacis, Olenoides, Paradoxides. 

 Family PHACopiDiE. — Dalmanites, Phacops. 

 Family Proetiile. — Harpides, Phsethonides, Phillipsia, Proetus. 

 Family Ptychoparid^e. — Agraulus, Crepicephalus, Liostracus, Longocephalus, 



Logauellus, Ptychoparia, Solenopleura. 

 Family Remopleurid;e. — Re mopleu rides. 



Family Trinuclkid^e. — Ampvx, Dionide, Endymionia, Trinucleus. 

 Family Affinity Uncertain. — Pemphigaspis. 

 Tracks supposed to be Crustacean. — Asaphoidichnus, Cliruachtichnites, 



Diplichnites, Protichnites, Rusichnites. 



SUBCLASS XIPHOSURA. 



Order Amphipeltida. 



Family Amphipelthle. — Amphipeltis. 



Order Eurypterida. 



Family Echinognathidje. — Echinognathus. 



Family Eurypterida. — Anthraconectes, Dolichopterus, Eurypterella, Euryp- 



terus, Pterygotus, Stylonurus. 

 Family Hemiaspid^e. — Bunodella. 



Order Xiphosura 



Famdly Belinurida. — Belinurus, Euproops, Protolimulus, 

 Family Cyclida. — Cyclus, Dipeltis. 



SUBCLASS EDRIOPTHALMATA. 



Order Amphipoda. 



Family Diplostylida. — Diplostylus. 



Order Anisopoda. 

 Family Acanthotelsonid.e. — Acanthotelson. 



