lf)2 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY III. 



tical, 17-98 to 105-17: fius excessively developed, much 

 more elevated in the males than in the females, the free 

 border of the dorsal, in the males at least, deeply incised : in 

 the males, the height of each of the three vertical fins is 

 greater than the length of the head: dortal rays 13, its 

 beginning rather nearer snont than base of dorsal : caudulfin 

 especially strong, the rudimentary rays at its base unusually 

 developed : least depth of caudal peduncle less than one-third 

 length of head : coloration rather silvery, the males probably 



rosy and tuberculate in spring latipinnis, 36. 



$^Fontanellc almost obliterated, reduced to a narrow slit: each jaw with a well- 

 developed cartilaginous sheath (as in Paiitoslens). 

 j. Body subterete, compressed behind, the depth 5 in length: in- 

 terorbital space 2 in head : head quite short, broad and 

 rounded above, 4f in length : eye small, far back and high up, 

 6 in head: mouth very large, inferior, beneath the projecting 

 snout : upper li^) very full.penfrent, with about 5 rows of tu- 

 bercles upon it : lower lip very full, moderately incised, with 

 about 10 rows, a notch separating the upper lip from the 

 lower, each jaw with a slightly curved cartilaginous sheath on 

 its edge, the two parallel with each other and fitting closely 

 together: tins small: dorsal rays 11; caudal little forked: 

 scales 15-90-11, very much reduced forwards and subject to 

 many irregularities : colors dusky : size small . . discobolus, 36. 



24. CATOSTOMUS NIGRICANS Le Sueur. 



Ilofj Sucker. Hog MuJlet. Hog Molhj. CiriwI-a-hoftom. Stone I\oller. Si07w Toter, 

 Stone Lugger. Hammer-head. Mud Suclcer. 



a. Subspecies nigricans. 



1817 — Caiosiomns nigricans Le SuEun, Jouru. Ac. Nat. Sc. Phila. 102. 

 Caiostomus nigrans (sic) Kiutla'nd, Rept. Zool. Ohio, 168, 1838. 

 Catoslomus nigricans DeKav, New York Fauna, part iv. Fishes, 202, 1842. 

 Caiostomus nigricans Cuvier & VALE^'CIENNES, Hist. Nat. des Poiss. xvii, 453, 



1844. 

 Caiostomus nigricans Storer, Synopsis, 421, 1846. 



Hylomyzon nigricans Agassiz, Am. Journ. Sci. Arts, 2d series, xix, 205, 1855. 

 Hylomyzon nigricans Putnam, Bull. INIus. Comp. Zool. 10, I860. 

 Hylomyzon nigricans Cope, Proc. Ac. Nat. Sc. Phila. 285, 1864, 

 Catosiomus nigricans Cope, Journ. Ac. Nat. Sc. Phila. 236, 1868. 

 Caiostomus nigricans Gunthek, Cat. Fishes Brit. Mus. vii, 17, 1868. 

 Catosiomus nigricans Cope, Proc. Am. Philos. See. Phila. 4G8, 1870. 

 Hylomyzon nigricans Jordan, Fishes of Ind. 221, 1875. 

 Hypentelium nigricans Jordan, Bull. Buffalo Soc. Nat. Hist. 95, 1876. 

 Hypentelinm nigricans Jordan, Man. Yert. 294, 1876. 

 Catosiomus nigricans Uhler & Lugger, Fishes of Maryland, ]^S, ]'^7'3 

 Hypentelium nigricans Nelson, Bull. No. 1 , Ills. Mus. Nat. Hist. 48, I67i: 



