NATURAL SCIENCES OP PHILADELPHIA. 281 



Radii D. I. T. A. I. 6; Y. 6; P. I. 9, the spine acute, serrate on inner 

 side, reaching half-way along ventral. Anal spine short, weaker 

 than adipose dorsal spine. Latter with adipose appendage. 



Straw color, with numerous indefinite brown spots on the sides. 

 Dorsal fiu with a large black spot covering anterior half, which 

 also expands on the dorsal region round the base of the fin. Four 

 vertical brown bands on caudal fin ; anal spotted. Cheeks with 

 bhie reflections. Length .058 m.; depth at D. I. .018 m. 



CORYDORAS TRILINEATUS, Cope, sp. nov. 



This species is easily distinguished from the other species here 

 noticed, by the shoi't, abruptly decurved muzzle, and three longi- 

 tudinal lateral lines. 



The head is much deeper than long, and enters the length with- 

 out caudal fin 3.5 times, and the greatest depth 1.5 times. Orbit 

 2.75 in head, 1.5 in convex interorbital space. Lateral shields 21- 

 20 ; two highly keeled azygus. Radii D. I. 7 ; A. I. 6 ; Y. 6 ; P. I. 6, 

 the spine acute, without serrations; the dorsal spine serrate 

 throughout behind, not extending to the base of the adipose 

 spine. Latter much larger than anal spine, attached to an adipose 

 portion. 



Light straw-colored, brownish above, a yellowish lateral band 

 with rather faint brown margin above and below, and blackish 

 median line. A very black spot on the ends of the soft dorsal 

 rays ; tail deeply forked, with five vertical bands ; anal spotted. 

 Some longitudinal lines on the side of the face. Length .049 ra., 

 depth .015 m. 



The mouth in this species is quite inferior. The peculiar struc- 

 ture of the lower lip, which is a festoon supported by a thin mem- 

 brane, I have verified on two individuals. The thick margin on 

 each side bears a very short barbel. 



CORYDORAS ACUTUS, Cope, sp. nov. 



A stout species, differing from the others, especially in the at- 

 tenuation of the muzzle, which viewed from above is narrow, and 

 contracted abruptly from the general outline. Mouth inferior, 

 lower lip wanting or not reverted. Head 3.1 times in length 

 without caudal, 1.33 times in depth. Orbit three times in head, 

 1.33 times in the nearly flat interorbital space. Lateral scuta 22- 

 21 ; no azygus plates. Radii D. I. 7 ; A. I. 6 ; Y. 6 ; P. I. 5, the 

 1872.] 



