42 MEMOIRS OF THE CARNEGIE MUSEUM. 



the dorsal some distance forward, but the scales irregular anteriorly; occipital 

 process short, only one-eighth of the distance from its base to the dorsal, bordered 

 by three scales; frontal fontanel reaching at least to above the anterior margin of 

 the pupil, entirely separating the frontals in the smaller specimen; snout pointed; 

 the mouth large; maxillary slender, extending beyond the suture between the 

 second and third suborbitals; premaxiUary with seven teeth; maxillary with about 

 twenty teeth along its entire edge, tricuspid in the largest specimen, in the smaller 

 the upper ones similar to those of the premaxiUary, the lower ones conical; dentary 

 with seven to nine tricuspid teeth and about fourteen minute ones on the sides, 

 conical in the smallest specimen, mainly tricuspid in the largest. Gill-rakers 7 + 11. 



Origin of dorsal equidistant from tip of snout and a point beyond the tip of 

 the middle caudal rays; height of dorsal about four times in the length; adipose 

 fin small; caudal forked, the lobes 3.5-4 in the length; origin of anal equidistant 

 from the base of the last ray and some portion of the eye; anal without indication 

 of a lobe, its margin slightly convex or straight; ventrals reaching beyond origin 

 of anal; pectorals beyond base of ventrals. 



Lateral line developed on thirteen to seventeen scales; scales with one to four 



radial striae; scales of the sides continued downward to form an anal sheath of 



from one to three series of scales free from the fin; scales on the end of the caudal 



peduncle irregularly arranged; caudal naked; a round or oval spot on the end of 



the caudal peduncle, not continued on the sides or on the fin. No other definite 



markings. 



Genus VII. Leptagoniates^^ Boulenger. 



Leptagoniates Boulenger, Proc. Zool. Soc, 1887, p. 281. 



Type : Leptagoniates steindachneri Boulenger. 



PremaxiUary, maxillary, and mandible with a single series of tricuspid teeth; 

 origin of anal far in advance of origin of dorsal, equidistant from tip of snout and 

 base of last dorsal ray; lateral line complete; adipose fin small. 



I am in doubt whether in the final analysis this genus will remain associated 

 with the Cheirodontinse. 



18. Leptagoniates steindachneri Boulenger. (Plate IV, fig. 3.) 

 Leptagoniates steindachneri Boulenger, I. c, p. 281, pi. XXIII, fig. 3 (Sarayacu, 



Peru); Eigenmann, Reports Princeton Univ. Exped. Patagonia, Vol. Ill, 



1910, p. 441. 



This species is known only from the type, 95 mm. long, in the British Museum. 

 I append the description given by Boulenger, I. c. : 



18 XexTos = thin; Agoniates, a genus of fishes. 



