CONTRIBUTIONS 



TO 



NORTH AMERICAN ICHTHYOLOGY. 



No. 2. 



A.-NOTES ON COTTIDi], ETHEOSTOMATID^E, PERCIDil, CEN- 

 TRARCHIDJ], APHODODERIDiE, UMBRIDil, ESOCIDiE, 

 DORYSOMATIDJl, CYPRINIDJ], CATOSTOMIDil, AND HY- 

 ODONTIDiE, WITH REVISIONS OF THE GENERA AND 

 DESCRIPTIONS OF NEW OR LITTLE KNOWN SPECIES. 



COTTID^. 



1. COTTOPSIS SPILOTUS, {Cojye) Jor. 



Uranidea sjnlota, Cope, Proc. Ac. Nat. Sci. Phila. 1865, 82. 



Cottopsis ricei, Nelson, Bull. Ills. Trans. Nat. Hist., 1876. — Jordan, Proc. Ac. Nat. Sci. 

 Pbila. 1877, 61. 



An examination of the types of U. sjpilota shows their probable iden- 

 tity with Mr. Nelson's species as above indicated. Prof. Cope's speci- 

 mens are in bad condition, and have lost the peculiar dermal spines. 

 Prof. Gill thinks that Cottopsis spilotus and Cottopsis semiscaher Cope 

 are Dot truly Cottopsis, the only species properly referable to that genus, 

 being G. asper Eich. (of which C. parvus Grd. is the young). At any 

 rate, G. spilotus and C. semiscaher form a well-marked group or section 

 intermediate between Cottopsis and Fotamocottus. 



ETHEOSTOMATID^. 



2. AMMOORYPTA BEANII, gen. et sp. nov. 



Generic characters. — Allied to Pleurolepis Agassiz. Body greatly 

 elongated, subcylindrical, and translucent. Head as iu Pleurolepis, but 



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