368 MEMOIRS OF THE CARNEGIE MUSEUM. 



The first specimen of this genus was received and described several years ago. 

 Both the specimen and description were forgotten, the latter never published. The 

 two specimens 13950 T. U. M. were received much later and independently 

 described. 



2. Branchioica bertonii Eigcnmann. (Plate XLIII, figs. 3-5.) 

 Branchioica bertoni Etgenmann, Proc. Am. Philos. Soc, LVI, Jan., 1918, p. 703. 

 13950, I. U. M., type, 24 mm., paratype about the same length over all, much 



curved. Taken from a large Characin, Piaractus brachypomus (Cuvier). 



Asuncion, Paraguay. Collected by A. de W. Bertoni. 

 7545, C. M., paratype, 24 mm. Puerto Bertoni, Alto Parana, from the branchia of 



Piaractus brachypomus (Cuvier). Bertoni. 



Fig. 38. Branchioica bertonii Eigenmann. a, mandible; b, left maxillary with its five teeth; c, 

 portion of another ma.xillary, showing the proximal teeth only. 



Head about 5.5; depth 5.5; D. 10; A. 7; P. 6; eyes superior, nearly the entire 

 e3^e in the anterior half of the head, 3.5 in the head, about equal to the length of the 

 snout, considerably larger than the interorbital ; maxillary barbel extending to very 

 near the interopercular spines, the lower barbel very minute; caudal peduncle 

 slender, abdomen well rounded; premaxillary with two irregular series of slender, 

 pointed teeth, those of the posterior series much the larger, about five in number, 

 subequal, both series graduated from the larger ones nearer the center outward; 

 laterad of the median series (on the premaxillary?) are four or five similar but smaller 

 teeth, graduated from the larger proximal one; the rami of the lower jaw widely 

 separated from each other, each with about five, recurved, pointed teeth in two 

 series on its end, in apposition to the lateral series of the upper jaw; gill-opening 

 minute, circular, gill-membranes perfectly confluent with the isthmus; opercle 

 with a bunch of about twelve, subequal, upward directed spines; interopercle with 

 about eleven curved, downward directed spines, arranged in two series; distance 

 from origin of ventrals to caudal 1 .6 in its distance from the snout, origin of anal 

 behind the origin of the dorsal; distance between anal and caudal about 5 in the 

 length; pectoral falcate, the outer ray not prolonged as a filament, about as long 

 as the head; origin of dorsal between that of the ventrals and anal, twice as far 



