284 PROCEEDINGS OP THE ACADEMY OP 



its anterior ray to the base of the caudal fin. Its anterior rays are three 

 times the length of the posterior, and equal to half the length from their base 

 to the base of the caudal. Muzzle obtuse; vertex plane; dorsal outline 

 arched from nape to fin. Caudal peduncle slender. Head entering length to 

 base of caudal 3| times, the greatest depth 4 times ; diameter of orbit in 

 length of head 3J times. Operculum as broad as long. Scales | 34. Radial 

 formula D. 18 ; C. 19, not deeply forked; anal elongate, with short base, 

 1 7. Ventrals reaching anus, 8. Pectorals just reaching ventrals, falcate. 

 Length 2-5 inches. 



Above reddish-straw color, without band ; sides and below silvery ; a dark 

 shade on the lateral line, most distinct on caudal peduncle. 



Grosse Isle, Detroit River. 



Hybognathus nucha lis, Agassiz. 

 Numerous specimens from Grosse Isle. 



Campostoma callipteryx, sp. nov. 



Lips well developed, free round the arched margins of both jaws. Muzzle 

 elongate, steeply descending from front ; outline to half way to dorsal strongly 

 but less steeply ascending. Eye superior, small, entering five times into 

 length, and nearly four times into breadth of head ; latter four and a half 

 times into length to emargination of caudal, a trifle less than greatest depth. 

 Ventrals under anterior margin of dorsal, not reaching to vent ; anal rounded 

 anteriorly. Scales with many weak radii, f 54, a much narrower area ex- 

 posed anteriorly than posteriorly. Caudal acute above, rounded below. 

 Radii, D. 1. 8. C. 19. A. 1. 8. V. 8 one side, 10 the other. P. 16. Pharyn- 

 geal teeth uniserial, 4 4. From end of muzzle to anterior base of dorsal in 

 a straight line, equal from base of caudal to middle of base of dorsal. Head 

 above with spinous tubercles. 



General color pale, dorsal regions and edge of operculum darker. Median 

 part of all the fins black, terminal membrane opalescent. Total length 5^ 

 inches. 



From Flint on the Flint River, which empties into Saginaw Bay. 



For distinguishing this genus from Chondrostoma I have relied on the less 

 number of teeth in the principal, usually the only, row. The development 

 of the lips diminishes in allied species, so that Girard's Hybognathus pla- 

 c i t u s cannot well be excluded from this genus. 



Campostoma mormyrus, sp. nov. 



Muzzle more elongate and much more depressed than in the next species. 

 Head four and one-half times in total length to caudal emargination ; eye five 

 times into length of head. Dorsal outline arched. Greatest depth four and 

 one-third times in length, greater than in gobionium. Scales about 

 equal, ? 49. Fins, D. 1. 8. C. 19. A. 1. 7. V. 8. P. 15, with the last 

 longer than in gobionium. Length about two and a half inches. 



Head and body above reddish ; sides and below silvery. Fins unspotted. 

 In these species the outline of the broad mandibular sheath is a flattened 

 arch. 



From Bruce, Macomb Co. 



Campostoma gobioninnm. 



This and the C. mo rmy rus and hippops* belong to the type of n asu- 



* Campostoma hippops, sp. nov. 



Muzzle very long and decuived, with the front convex transversely. Eyes high, small, enter 

 six times into length of head. Back or >ad, arched in frontof dorsal, not so steep as front. From 

 base of caudal to front base of dorsal a little less than from latter to end of muzzle. Head 4% 



times in length. Scales f 57. Fins small ; D. 1. 8. C. 19. A. 1.7. V. 1. 8, two-thirds distance to 

 o 



[Dec. 



