CLASS CKUSTACEA. 



FAMILY ACIDASPID^E.— Acidaspis, Terataspis. 



FAMILY AGLASPIDiE— Aglaspis. 



FAMILY AGNOSTID^E.— Agnostus, Shumardia. 



FAMILY ASAPHID^E. — Asaphus, Bathyurellus, Bathyurus, Dolichometopus, Ilkenus, 



Illsenurus, Isotelus, Megalaspis, Nileus, Ogygia. 

 FAMILY BRONTEIDyE.-Bronteus. 



FAMILY CALYMENID.E.— Arges, Calymene, Homalonotus. 

 FAMILY CERAURIDiE. — Amphion, Ceraurus, Encrinurus, Sphserexochus. 

 FAMILY CONOCEPHALIDJE.— Conocephalites, Conocoryphe, Crepicephalus, Dicello- 



cephalus, Ptychaspis, Solenopleura. 

 FAMILY CYPHxYSPID^.— Cyphas. 



FAMILY CYTHERID/E.— Cythere, Cytherina, Cytheropsis. 



FAMILY ETJRYPTERIDiE.— -Anthraconectes, Dolichopteris, Eurypterus, Pterygotus. 

 FAMILY HARPEDID.E.— Harpes, Harpides. 



FAMILY LEPERDITIID^E.— Beyrichia, Isochilinia, Leperditia, Primitia. 

 FAMILY LICHASID.E.— Lichas. 

 FAMILY PARADOXIDiE— Agraulos, Anapolenus, Arionellus, Bathynotus, Chario- 



cephalus, Loganellus, Menocephalus, Olenellus, Olenus, Paradoxides, Remopleu- 



rides, Telephus, Triarthrella, Triarthrus. 

 FAMILY PHACOPID^E.— Dalmanites, Phacops, Thaleops. 



FAMILY PROETID^E.— Phillipsia, Prcetus. [cleus. 



FAMILY TRINUCLEIDvE. — Ampyx, Endymionia, Holometopus, Microdiscus, Trinu- 

 ORDER AMPHIPODA.— Diplostylus. 

 ORDER CIRRHOPODA.— Plumulites. 

 ORDER ISOPODA— Acanthotelson. 



ORDER MACRURA. — Anthraeopalsemon, Archseocaris, Palseocaris. 

 ORDER PHYLLOPODA. — Ceratiocaris, Dithyrocaris, Leaia, Solenocaris. 

 ORDER STOMAPODA.— Amphipeltis. 

 ORDER XYPHOSURA.— Euproops. 

 INCERTyE SEDIS. — Climachtichnites, Diplichnites, Helminthoidichnites, Protichnites, 



Rusichnites. 



Acantfwloma, syn. for Acidaspis. 



gpinosa, syn. for Acidaspis tuberculata. 

 Acanthotelson, Meek & Worthen, 1860, 



Proc. Acad. Nat. Sci. [Ety. akantha, 



a spine; telson, the end.] 

 eveni. Meek & Worthen, 1868, Am. Jour. 



Sci., vol. 46, Coal Meas. [Ety. proper 



name.] 

 iruequalis, syn. for Palseocaris typus. 

 stimpsoni, Meek & Worthen, 1865, Proc. 



Acad. Nat. Sci., Coal Meas. [Ety. 



proper name.] 



Acidaspis, Murchison, 1839, Sil. Syst. [Ety. 



akis, a spear-point; aspis, a shield.] 

 anchoralis, S. A. Miller, 1875, Cin. Quar. 



Jour. Sci., Cin. Gr. [Sig. anchor-like.] 

 ceralepta, Anthony, 1838, (Ceratocephala 



ceralepta) Am. Jour. Sci., Cin'ti Gr. 



Not clearly denned, 

 cincinnatiensis, Meek, 1873, Ohio Pal., 



vol. 1, Cin'ti Gr. [Ety. proper name.] 

 crosotus, Locke, 1843, Am. Jour. Sci., vol. 



44, Cin'ti Gr. [Ety. crossotos, fringed.] 



The word is misspelled— it should be 



crossota. 



