226 ON THE DISTRIBUTION OF FRESHWATER FISHES 



merldionalls, though his figure represents it. It is leather-colored in life, with three 

 broad cross-bars under second dorsal and just behind it. All the fin rays barred with 

 dusky. There is no red about this species in life. Largest specimen six inches long. 

 It abounds in cold springs, such as often issue in great volume from subterranean 

 channels in the limestones of the central and southern Allegheny regions. 



A similar habit characterizes the U. viscosa in Pennsjdvania. This is the species 

 called by Abbot* G. copei. 



CYPRINIDJS. 

 CERATICHTHYS Baird. 



Of this genus three species were obtained : G. hlguttatus Kirtland, and the two 



below described for the first time. The first mentioned is abundant in all the water 



basins examined; the larger specimens occur in the river channels almost entirely. 



The new species should be associated with G. dissimilis Kirt. and G. cataractce Cuv. 



Val. in my Section II of the genus, but its characters must be altered to include 



them, as follows: 



Sect. II. Mouth more or less inferior, small; teeth 4 — 4: or 

 1"4 — 4-1 ; size small. 



Scales large, 5 — 39 — 3; eye oval, three times in head; latter one- 

 fourth length ; depth 4-75 in do. ; silver, a leaden band on side ; fins 

 unspotted, C. htalinus. 



Scales small, 8 — 56 — 4 ; eye round, 4-2 times in head ; latter i total 

 length, flat above, with long muzzle ; depth 5-2 — 5 in length ; uni- 

 form silver below, dorsal fin black behind, . . . . . (J). MONACiius. 



Ceratichthys hyalinus Cope, sp. nov. 



This is the smallest species of the genus, and approaches nearest the G. dissimilis. 

 It is shorter than the latter, has a larger eye and larger scales. 



Muzzle elongate, profile obtuse, projecting beyond lips. Eye large, equal muzzle, 

 two-fiftlis longer than interorbital width. Extremity of maxillary opposite its 

 anterior nine barbels well developed. Operculum considerably deeper than long. 

 Inferior fins short, not reaching each other. Radii, D. i. 8. C. +18+. A, i, 8. V. 8. 

 P. 15. Total length 3 in. 4'5 lines; end muzzle to origin dorsal 16'5 lines; from 

 latter to basi.s caudal 17"25 lin, Depth at orbit 3"75 lin. ; do. at last anal ray 3'76 1. 

 Pharyngeal teeth 1'4 — 4-1. 



In life translucent above; sides and below silvery, a plumbeous lateral band more 

 distinct posteriorly, where it sometimes ends in a spot. Top of head and streak 

 through eye blackish ; no vertebral band. Fins immaculate. 



* Proc. Acad. 1860, 320. 



