346 CHAEACINID^. 



A. Mandibulary teeth in a single series. 



1. Jaws without external tooth-like processes. 



a. Intermaxillary teeth in two almost confluent series : Anacyrtus. 



1. Anacyrtus gibbosus. 



Charax, sp., Grmiov. Mus. Ichth, i. p. 19. no. 53. tab. 1. fig. 4 ; Zoo- 



phyl. p. 124. no. 380. 

 Salmo gibbosus, L. Syst. Nat. i. p. 513 ; Bl. Schn. p. 419. 

 Epicyi-tus gibbosus, Miill. <§• Trosch. lior. Ichth. i. p. 17. taf. 2. fig. 1 



(dentition). 

 Cynopotamus gibbosus, Cuv. Sc Val. xxii. p. 321. pi. 645. 

 Epicvrtus maerolepis, Kner, Denkschr. Acad. Wiss. Wien, 1860, xviii. 



p. *47. taf. 6. fig. 14 *. 



D. 11. A. 53-57. V. 8. L. lat. 57-58. 



Teeth in the intermaxillary in a double series, the two series being 

 so close together as to be almost confluent into one ; no external 

 divergent teeth ; mandibvdaiy teeth in a single series. Back elevated, 

 the tipper profile of the head and nape forming an S-shaped curve. 

 The height of the body is contained twice and two-thirds in the total 

 length (without caudal), the length of the head four times and one- 

 fourth ; the origin of the dorsal fi.n is above the fourth anal ray, the 

 root of the ventral before the middle of the pectoral. 



Guianas. 

 a. Adult : skin. Type of the species. From Gronow's Collection, 

 h. Adult. Surinam. Purchased of Mr. Frank. 

 c-e. Adult and half-grown. British Guiana. Presented by SLc R. 

 Schomburgk. 



2. Anacyrtus pauciradiatus. 

 Similar to A. gibbosus, but with fewer anal rays. 

 D. 11. A. 45-49. V. 8. L. lat. 56. 



No external divergent teeth ; teeth in the intermaxillary in a 

 double series, the outer series, however, containing only a few teeth, 

 which are almost confluent with the inner series ; mandibulary teeth 

 in a single series ; canine teeth well developed. Back elevated, the 

 upper profile of the head and nape forming an S-shaped curve. The 

 height of the body is contained twice and two-thirds in the total 

 length (without caudal), the length of the head thrice and four-fifths. 

 Maxillary straight ; the width of the interorbital space equals the 

 diameter of the eye, which is two-sevenths of the length of the head. 

 The origin of the dorsal fin is midway between the extremity of the 

 snout and the root of the caudal fin, above the second anal ray ; the 

 root of the ventral corresponds to the middle of the pectoral fin. 

 Silvery, with a humeral and caudal spot. 



Para, 

 a-b. From 4 to 5 inches long. River Capin. Purchased of Mr. Stevens. 



* Although Kner liimself identifies his specimens with the species described 

 by Gronow, they may possibly belong to A. pauciradiatus, as Kner Las omitted 

 to state the number of anal rays. 



