676 GEOLOGICAL SURVEY OF NEW JERSEY. 

 Family CYPRINIDiE. 



Carps and Minnovrs. 



Margin of upper jaw formed by premaxillaries only ; head naked ; 

 branchiostegals three; gills four, slits five, with a pseudobranch ; 

 ventral fins abdominal ; air-bladder large, often constricted into two 

 lobes. 



CHROSOMUS. Raf. 

 (Luxilus. Leuciscus.) 



C. erythrogaster, Raf., var. eos, Cope. Red-bellied Dace. 



Lateral line incomplete ; dorsal fin well back, short, without 

 spine ; sides of body with two black .stripes, faint in female ; 

 head pointed ; mouth terminal and oblique ; fins and scales 

 small ; color brownish olive, with dusky line on back ; silvery 

 on sides and belly, scarlet in males in spring, and fins yellow. 

 Length, 2| inches ; dorsal rays, 8 ; anal rays, 8 ; lateral lines, 

 77. Susquehanna basin ; possibly also Delaware basin. 



HYBOGNATHUS, Ag. 

 H. argyrites, Grd. [nuchalis, osmermus, Cope, regius.) Silvery Minnov/. 

 Lateral line complete ; mouth oblique ; dorsal over ventrals ; 

 scales large ; eye large ; olivaceous green above ; sides silvery ; 

 head large ; upper jaw heavy, lower thin ; fins unspotted. 

 Dorsal rays, 8 ; anal rays, 7 ; length, 5 inches or less. Var. 

 nuchalis, Ag., ranges west, is smaller and has mouth horizontal ; 

 var. regius, Grd., is larger and more southerly. 



HYBORHYNCHUS, Ag. 

 H. notatus, Raf. {Minnilus, 'Ra,L,perspi(yims, Grd.) Blunt-nosed Minnow. 

 First ray of dorsal short and spine-like ; head short ; mouth 

 small and inferior, upper jaw protractile ; alimentary canal long ; 

 fins short, a black spot on dorsal ; males with about fourteen 

 large tubercles on snout in spring ; lateral line complete ; body 

 elongate; brownish or bluish. Length, 3 to 4 inches. Var. 

 superciliosus, found associated with it, has a broader head and a 

 distinct barbel at each angle of mouth. New York to Ten- 

 nessee. 



