428 MEMOIRS OF THE CARNEGIE MUSEUM 



Eighteen specimens, 200-400 mm. Georgetown trenches. (C. M. Cat. No. 

 1765a-e; I. U. Cat. No. 12592.) 



Ten specimens, 150-450 mm. Creek below Potaro Landing. (C. M. Cat. 

 No. 1766a-d; I. U. Cat. No. 12593.) 



Nine specimens, 65-390 mm. Amatuk. (C. M. Cat. No. 1767a-d; I. U. 

 Cat. No. 12594.) 



Ten specimens, 118-212 mm. Wismar. (C. M. Cat. No. 1768a-d; I. U. Cat. 

 No. 12595.) 



Eight specimens, 111-212 mm. Crab FaUs. (C. M. Cat. No. 1769a; I. U. 

 Cat. No. 12596.) 



Six specimens, 90-100 mm. Erukin. (C. M. Cat. No. 1770«-6; I. U. Cat. 

 No. 12597.) 



Three specimens, 115-378 mm. Warraputa. (C. M. Cat. No. 1771a; I. U. 

 Cat. No. 12598.) 



Six specimens, 128-350 mm. Mud Creek, Aruka River. (C. M. Cat. No. 

 1772a-6; I. U. Cat. No. 12599.) 



Two specimens, 180-195 mm. Konawaruk. (C. M. Cat. No. 1773a; I. U. 

 Cat. No. 12600.) 



One specimen, 430 mm. Issorora Rubber Station trenches. (C. M. Cat. 

 No. 1774a.) 



One specimen, 215 mm. Waratuk. (C. M. Cat. No. 1775fl.) 



Head 6.8-7.25, depth 7-7.3 in the length to the end of anal; anal rays 245-296.«« 



Snout 2.75-3, interorbital about 3 in the head; eye 3.75-4 in the snout, about 

 4 in the interorbital, and 10-13 in the head. 



Compressed; width of the head 2-2.25, depth of the head in the occipital 

 region about 1.5 in the greatest depth; anus about twice the eye behind the vertical 

 from the eye; dorsal profile weakly convex; ventral slightly more convex than 

 dorsal. 



Snout heavy, rather pointed, but truncate at the tip; mouth moderate, gape 

 medium, reaching about half-way to the eyes; jaws equal, lower included on the 

 sides. 



Caudal peduncle 4.5-5 in the total length; pectorals about 2.4 in the head; 

 origin of the anal in front of the pectorals, about twice the snout behind the eye. 



