EIGENMANN: the PYGIDIID^, a family of south AMERICAN CATFISHES. 373 



me by Dr. Fuhrmann, whose generosity, since he himself proposes to pubhsh an 

 account of the anatomy of the species, I greatly appreciate. 

 7603, C. M., 40.5 mm. Marajo. From Dr. O. Fuhrmann. 



Head about 7; depth about 12; D. 7 (showing in photograph); A. about 25 

 (showing in photograph). 



Heaviest at back part of head, tapering regularly to the base of the caudal, the 

 depth of which is about one-third that of the head ; mental barbels in pairs, not reach- 

 ing pectoral, maxillary barbels sometimes to middle of pectoral; pectoral short and 

 narrow, but little more than half as long as the head ; distance from snout to origin of 

 ventrals about one and a half in the distance between caudal and origin of ventrals ; 

 caudal small, rounded, one and one-half in the length of the head; origin of dorsal 

 in advance of that of the ventrals, its last ray about over origin of anal; upper acces- 

 sory caudal rays beginning about over the origin of the second third of the anal, the 

 highest one but little lower than the dorsal rays; anal continuous with the lower 

 accessory caudal rays; ventrals a little shorter than the pectorals. Color uniform. 



