180 



Annals of the Carnegie Museum. 



Mead 4, depth about 2.3; D. 11 ; A. 23-26; scales 7-35-5; eye 2.5; 

 interorbital about equal to the eye. Deep, compressed; innominate 

 bones very strong, diverging forward, the ends protruding as spines 

 (as in Astyanax mucronatus), the space between them concave; no 

 regular median series of scales in front of the ventrals; predorsal line 

 with about ten scales; occipital process about 5 in the distance from its 

 base to the dorsal; interorbital convex, the frontal fontanel 1.5 in the 

 parietal; snout short, blunt; second suborbital leaving but a narrow 

 naked margin; maxillary shorter than the snout. Premaxillary with 

 five broad, nine- (or more) pointed incisors in the second row; two 



Fig. 



mann. 



2. Ventral fins and protruding spines of Deulerodon acanthogaster Eigen- 



much smaller, five-pointed teeth in the front row; maxillary with two 

 teeth similar to those of the second series; dentary with eight gradu- 

 ated teeth. Gill-rakers 6 + 9. Scales regularly imbricate except over 

 the origin of the anal, where there is sometimes an interpolated scale. 

 Caudal naked, anal sheath very imperfect, consisting of a few scales at 

 the base of the anterior rays. Origin of the dorsal nearer to the snout 

 than to the caudal, its highest ray 3 in the length; anal long, 

 emarginate; ventrals reaching anus or anal; pectoral reaching ven- 

 trals. A faint humeral bar, a silvery lateral band, a well defined oval 

 caudal spot continued on the base of the middle caudal rays. 

 Allied to pinnatus Eigenmann. 



Explanation of Plates. 



Plate IV. 



Fig. 1. Probolodits heterostomus Eigenmann. (Type.) 63 mm. Cam. Mus. 

 No. 2973. 



Fig. 2. Psalidodon gymnodonlus Eigenmann. (Type.) 189 mm. Cam. Mus. 

 No. 3204. 



Fig. 3. Psalidodon gymnodonlus Eigenmann. (Type.) 189 mm. Cam. Mus. 



No. 3204. (Head magnified.) 



Plate V. 



Fig. 1. Spintherobolus papilliferus Eigenmann. (Type.) 41 mm. Cam. 

 Mus. No. 3582. 



Fig. 2. Spintherobohis papilliferus Eigenmann. (Cotype.) Side of head, show- 

 ing tactile papilla 3 . Cam. Mus. No. 3883a. 



