33. CERATICnXHTS. 177 



Cevalic'hthys prosthemius, Cope, Joiirn. Ac. Nut. Sc. PliUad. .\iii. 



p. ;u;5, pi. 11. tij;:. 4. 



D. 9. A. 8. L. lat. 60. L. transv. 11/12. 



The height of the body is about equal to the length of the head, 

 and two-iiiuths of the total (without caudal) ; the diameter of the 

 eye is cijual to the length of the snout, and nearly one-fourth of the 

 length of the head. Barbels small. The origin of the dorsal fin is 

 midway between the end of the snout and the root of the caudal, 

 and a little behind that of the ventrals. There are eight longi- 

 tudinal scries of scales between tlie lateral line and the root of tiie 

 ventral fin. An indistinct blackish band runs along the middle of 

 the side, terminating in a small black spot at tlie root of the caudal 

 fin. This band appears to be more or less entirely lost with age, but 

 is very distinct in young examples. Pharyngeal teeth 4 . 1 — 1 . 4. 



Lake Superior. 

 a. Half-grown. Lake Superior. Presented by Th. Moore, Esq. 



3. Ceratichthys dissimilis. 



Leticiscus dissimilis, Kirf/and, Bod. Journ. Nut. Hid. iii. p. ;^41, 



pi. 4. fig. -2. 

 Ceratichthys dissimilis, Cope, Proc. Ac. Nat. Sc. 18G4, p. 277 ; 



Juurn. Ac. Nat. Sc. Philad. xiii. p. 368, pi. 12. fig. 1. 



D. 10. A. 8. L. lat. 47. L. transv. 6^/7 i. 



Barbel minute. The eye occu])ies the middle of the length of the 

 head, and is not much shorter than the snout. The height of the 

 body is contained five times and one-half in the total length (with- 

 out caudal), the length of the head four times. The orig-in of the 

 dorsal fin is a little nearer to the end of the snout than to the root 

 of the caudal. There are three and a half longitudinal series of 

 scales between the lateral line and the root of the ventral fin. A 

 greyish-silvery band runs from the snout to the root of the caudal ; 

 a series of round darker spots along this band. 



Pennsylvania ; Mahoning liiver ; Lake Erie. 



a-b. Youghioghany River. Purchased of Mr. Sahan, 



4. Ceratichthys cmniugii. 



D. 10. A. 9. V. 7. L. lat. 45. L. transv. 6/6. 



Barbels minute. The eye is situated entirely in the anterior half 

 of the length of the head, and nearly as long as the snout, which is 

 obtuse, rounded, convex, the mouth being subinferior. The lengtii 

 of the head is contained four times and one-third in the total 

 (without caudal), the height of the body five times. Interorbital 

 sjjace convex, as wide as the orbit ; suborbital ring extremely 

 narrow. . The origin of the dorsal fin is a little behind that of the 

 ventrals, and somewhat nearer to the root of the caudal than to the 

 end of the snout. Pectoral not reaching the ventral. There are 

 four longitudinal series of scales between the lateral line and ven- 



voi,. vn. s 



