178 CTPRINIDiE. 



tral fin. A greyish-silvery band runs from the gill-opening to the 

 root of the caudal, where it terminates in a black spot. 



California. 

 a-b. Three inches long. Purchased of the late Mr. H. Cuming. 



5. Ceratichthys biguttatus. 



Semotilus biguttatus, Kirthmd, Host. Journ. Nat. Hist. iii. 1840, 



p. 344, pi. 5. fig. 1 (bad). 

 Leuciscus biguttatus, Dekay, Neiv York Fauna, Fish. p. 214 ; Storer, 



Si/nopsis, p. 161. 

 Ceratichtliys biguttatus, Baird ^ Girard, Proc. Ac. Nat. Sc. Philad. 

 1856, p. 213; Cope, Journ. Acad. Nat. Sc. Philad. xiii. p. 366, 

 pi. 11. fig. 5. 



D. 9. A. 8. L. lat. 40. L. transv. 6^/7|. 

 Mouth subinferior. Barbel very small, h;df as long as the eye. 

 The eye occupies the middle of the length of the head, and is about 

 one-half of the extent of the snout. The height of the body is con- 

 tained four times and one-fourth or four times and one-third in the 

 total length (without caudal), the length of the head thrice and 

 three-fourths or thrice and four-fifths. The origin of the dorsal fin 

 is a little nearer to the root of the caudal than to the end of the 

 snout. There are four and a half longitudinal series of scales be- 

 tween the lateral line and the root of the ventral fin. A very in- 

 distinct dark band along the middle of the side of the tail. 



United States. 

 a-c. Adult. Susquehanna River. Purchased of Mr. Salvin. 

 (/. Adult (head with tubercles). Ohio. Presented by Th. Moore, Esq. 

 e-f. Adult, skins. Ohio. Purchased of Mr. Parnell. 

 g.' Adult (head with tubercles). Purchased of Mr. Cope as Photo- 

 genis sccthriceps. 



6. Ceratichthys cyclotis. 

 Cope, Proc. Acad. Nat. Sc. Philad. 1864, p. 277. 



D. 10. A. 9. L. lat. 41. L. transv. 7/?, 



" Body much compressed, dorsally flat ; the height four times and 

 two-fifths in total length. Muzzle obtuse, rounded ; bead entering 

 four times and one-third in length (to emargination of caudal ) ; 

 anterior base of dorsal measures one-half the distance from end of 

 muzzle to base of tail ; lateral line nearly straight ; operculum 

 rounded posteriorly, scarcely concave above. Eye contained five 

 times and one-half in length of head. Dermal head tubercles longest 

 on vertex, smallest on muzzle, in four alternating rows, one on each 

 side becoming superciliary. The dorsal and anal are much prolonged 

 posteriorly, the greatest horizontal length of the former nearly equal- 

 ling the length of the upper surface of the head. Colour of upper 

 surfaces olive -brown ; below, from above lateral line, jicllowish ; 

 prffiopercular region rosy ; pectorals slightly dusky, otherwise no fin- 

 markings." 



Michigan and Kansas. 



