208 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY III. 



Carpioaes vit ulus Agassiz, Am. Journ. Sc. Arts, 1855, p. 356. "From 

 the Wubash River, Indiana. This seems to be a smaller species than 

 the preceding ones. The form of the body resembles that of C. Taurus, 

 but the eyes are smaller ; the opercle is more broadly rounded behind ; 

 the subopercle has its posterior and free border regularly arched above 

 and below, and not emarginate as in C. Taurus. The direction of the 

 numerous water-tubes on the head and cheeks also differ. The upper 

 and lower border of the scales are nearly straight. The dorsal does not 

 extend quite so far forward. I am indebted to Col. Richard Owen of 

 New Harmony for this species." 



Ichthyobus cyanellus Nelson, Bull. Ills. Mus. Nat. Hist, i, 1877, p. 49. 

 u Blue Buffalo. A number of specimens of this species are in the state 

 collection, from the Illinois river, and in Prof. Jordan's collection, from 

 the Mississippi at St. Louis. The following is the description, taken 

 from several specimens, measuring from 8 to 9J inches in length : 



" Head about 3J in length. Depth 2J to 5-6. Eye 4J to 5 J in head. 

 Dorsal I, 30. Anal I, 8. Yentruls 10. Lat. 1. 38. Longitudinal rows 

 7-5 to 7-6. Body compressed, high. Anteriorly broad, compressed 

 behind. Longest ray reaching 18th ray. Pectorals shorter than veu- 

 trals, both shorter than head. Anal scarcely reaching caudal ; head 

 very short, high and thick ; its thickness J length, depth 11 in length. 

 Mouth quite small, oblique, and overlapped by a slightly projecting 

 snout. Mandible short, 4 in head. Opercle becoming wrinkled with 

 age. Head small, short and thick ; muzzle obtuse, conic, not twice the 

 length of eye. Anterior ray of dorsal, in type from Illinois river, 

 slightly nearer snout than base of caudal. In specimens from St, 

 Louis the dorsal is about equidistant. Color above, light steel blue in 

 adults, becoming lighter below. Young lighter with distinct stripes 

 along the rows of scales. Although the species is described from spe- 

 cimens but nine inches long, when full grown it undoubtedly reaches 

 similar dimensions to its congeners." 



Bubalichthys altm Nelson, MS3.; Proc. Acad. Nat. Sc. Phila. 1877, 

 74. u This specimen is very deep and much compressed. The back is 

 much arched and the profile descends steeply in front to end of snout, 

 not forming an angle with it as in many species of Ichthyobus. 



u Depth of body, 2J in length ; head, 4 in length; greatest thickness 

 of body, If in length of head; depth of head, 1 in its length; width, 

 1 in length. Eye, 5 in head, 2J in interorbital space, which is but 

 little rounded. 



