Cope.] 466 [June 7, 
Scales 5-394, eye 4.25 to 4.5, less than length muzzle; bead wide, en- 
tering length 4.66 times; A. 8. H. NUCHALIS. 
II. Suborbital bones long, slender; speculum on postfrontal region 
little marked. 
Scales 6—38—4; head 4.75 times in length, wide; eye large 3 times 
in head, larger than length muzzle; A. 7. 
H. OSMERINUS.* 
Scales 5-6-———36-——3-4 ; head narrow 4.25 times in length ; eye large, 
diameter exceeding muzzle, 3.3 times in head; A. 8. 
: H. ARGYRITIS. 
58. HYBOGNATHUS ARGYRITIS, Girard. 
Proc. Acad. Nat. Sci., Phila., 1856, 182. U.S. Pac. R. R. Surv., vol. 
X. Tab. 
This species was described by Dr. Girard, from specimens obtained by 
the U. 8. Explorations for the Pacific Railroad route, from the Milk and 
Arkansas Rivers. It appears to be very abundant in the Catawba River, 
North Carolina. Specimens from it cannot be distinguished from those 
from the Arkansas in the Museum of the Smithsonian Institution. 
CAMPOSTOMA, Agass. 
59. CAMPOSTOMA ANOMALUM, Raf. 
Rutilus Raf., Campostoma, Agass. 
From the Cumberland, Clinch and French Broad Rivers, west of the 
Alleghenies and the Catawba River east of them. 
CATOSTOMID &. 
Prof. Gill proposed to distinguish this group from the Cyprinide as a 
family (in Proc. Acad. Nat. Sci., Phila., 1861, p. 8), basing the latter 
on the peculiar characters of the pharyngeal bones and teeth. This 
course has not been followed by subsequent writers, and the character 
assigned does not appear to me to warrant the proposed separation. I find, 
however, that while the premaxillary bone completes the superior arch of 
the mouth in the Crypinide, in the Catostomide, those bones form but a ~ 
slight portion of the same, the maxillary bones entering into it extensively 
on each side. This feature is evidently of importance sufficient to define 
the family, and I therefore adopt it as left by Prof. Gill. 
* HYBOGNATHUS OSMERINUS, Cope spec. nov. 
The characters of this species are expressed in the above table. Itisvery near the H.argyritis 
Gir. but has a materially shorter bead and smaller anal fin. The head is relatively wider. The 
preorbital bone is about as long as deep. The mandible very attenuate, and with a slight 
symphyseal tubercle. End of maxillary not beyond line of posterior nares. Orbit large. DI, 8, A. 
1.7. (H. regius has 1I-9 A., according to Girard.) Total length 31.2. lines ; of head 51.; to basis 
dorsal 12.51.; to basis caudal 12.71. Pectorals and ventrals very short; first articulated dorsal ray 
6 lines long. A broad silver lateral band ; bright olive above it, pale below it : no black spot on 
basis caudal. Speculum on postfrontal region small and little visible, 
This species is abundant in the Raritan River, New Jersey,in early spring ascending the river 
with the smelt (Osmerus). Discovered by my friend, Dr. Chas. C. Abbot, of Trenton, who is 
investigating the ichthyology of New Jersey. 
