426 MEMOIRS OF THE CARNEGIE MUSEUM 



Thirty-two specimens, 80-340 mm. Nickaparu Creek. (C. M. Cat. No. 

 1777a-e; I. U. Cat. No. 12623.) 



Eighteen specimens, 65-310 mm. Creek below Tukeit. (C. M. Cat. No. 

 1778a-e; I. U. Cat. No. 12624.) 



Fifteen specimens, 80-380 mm. Aruataima. (C. M. Cat. No. 1779a-e; I. U. 

 Cat. No. 12625.) 



Twelve specimens, 51-90 mm. Tukeit. (C. M. Cat. No. 1780a-c; I. U. 

 Cat. No. 12626.) 



Six specimens, 59-105 mm. Below Packeoo Falls. (C. M. Cat. No. 1781a-&; 

 I. U. Cat. No. 12627.) 



Four specimens, 125-198 mm. Gluck Island. (C. M. Cat. No. 1782a; I. U. 

 Cat. No. 12628.) 



Ten specimens, 50-176 mm. Kumaka. (C. M. Cat. No. 1782a-d; I. U. Cat. 

 No. 12629.) 



Five specimens, 132-205 mm. Mud-flats, Aruka River. (C. M. Cat. No. 

 1784a; I. U. Cat. No. 12630.) 



Five specimens, 80-115 mm. Creek flowing into the Barima River. (C. M. 

 Cat. No. 1785; I. U. Cat. No. 12631.) 



Seven specimens, 125-162 mm. Above Kumaka. (C. M. Cat. No. 1786a-6; 

 I. U. Cat. No. 12632.) 



One specimen, 190 mm. Packeoo Falls. (C. M. Cat. No. 1787a.) 



One specimen, 320 mm. Georgetown trenches. (C. M. Cat. No. 1788a.) 



One specimen, 230 mm. Botanic Garden. (C. M. Cat. No. 1789a.) 



One specimen, 240 mm. Chipoo Creek. (C. M. Cat. No. 1790a.) 



One specimen, 260 mm. Maripicru Creek. (C. M. Cat. No. 1791a.) 



Head 7.25 (old individuals) -9 (young specimens); depth 8.5-13 in the 

 length to the end of the anal; A. 200-260. 67 



Snout 2.5-2.75; interorbital 2.25-2.5 in the head; eye 4 (young)-5.5 in the 

 snout, 4.25-5 in the interorbital, 10-12 in the head. 



Body cylindrical; head depressed; width of the head 1.25-1.6, depth of the 



head at base of occipital process 1.5-1.8 in the greatest depth; anus on the vertical 



from a point the length of the snout behind the eye; dorsal profile almost straight; 



ventral profile slightly convex. 



217, 218, 224, 256. 



224, 228, 240, 254. 



215, 216, 230, 260. 



217, 225, 240, 260. 



220, 225, 235, 245. 



