JAN., 1918. FISHES FROM THE Arm RIVER HUBBS. n 



Depth of body, 3.1 (3.0 to 3.35)* in length of base of caudal; length 

 of caudal peduncle, from anal base to end of last vertebra, 1.4 (1.3 to 

 1.5) times its depth. Extreme length of head 3.3 (3.2 to 3.3); snout, 

 3.2 (3.1 to 3-35) 1 ; eye, 5.3 (4.4 to 5.7); bony interorbital width, 3.35 

 (3.5 to 3.7); upper jaw extending to between verticals from posterior 

 nostril and eye, its length 3.4 (3.25 to 3.5) in head; lips well developed, 

 the lower continuous across the chin, where it is produced slightly 

 backward as a rounded lobe as long as the pupil. Anterior barbel 

 usually shorter the eye (0.9 eye in type), at most barely as long as the 

 eye; posterior barbel 5/6 as long as the eye in the type (shorter in some 

 paratypes, at most l /6 longer than the eye). 



Scales sculptured with fine cross-set longitudinal striae; scale-rows 

 in type: 26 on the left side, 24 on the right side, along the lateral line 

 (including 2 on the base of the caudal rays) ; 4^2 below, and 4^ above, 

 lateral line; 2 between lateral line and the pelvic fin; 12 around caudal 

 peduncle. 



Table showing variation in number of scales along lateral line: 



The distance from the origin of the falcate dorsal to the occiput is 

 equal to the distance from the end of the dorsal base to the upper free 

 base of the caudal, or one orbital length beyond. Dorsal rays, 3 simple 

 plus 9 (20 specimens), or 8 (2), branched rays; the third simple ray is 

 articulate along its front edge and on its soft tip, but greatly strength- 

 ened posteriorly by the deposition of bone, in which the articulations 

 are mostly obsolescent; this third ray is grooved behind to receive the 

 first branched ray when the fin is depressed; its posterior edges are 

 smooth and even; the length of the bony portion of the ray is contained 

 1.6 (1.3 to 1.6) times in the head, reaching its proportionate maximum 

 in specimens about 80 mm. long, in which the ray is contained from 

 1.2 to 1.4 times in the head. Anal rays, 3 simple and 5 divided; the 

 longest, when depressed, reaching the base of the lowermost caudal 

 rays. The pectoral reaches to, slightly beyond, or not quite to, the 

 vertical from the insertion of the pelvic fin; its length is contained 1.3 

 (1.3 to 1.4) times in the head ("pectoral as long or slightly shorter 

 than the head" in B. krapfi, "not reaching ventral"). The base of the 

 pelvic fin lies below the origin of the dorsal. 



1 Measurements given of the ten paratypes, smaller in smaller specimens. 



