eigenmann: the FRESHWATER FISHES OF BRITISH GUIANA 269 



Table or Scales in the Lateral Line of C. ciliatus. 



I have examined the type of A. ciliatus in Berlin and that of C. essequibensis in 

 London, and: 



Three specimens. 161-170 mm. Rupununi. (C. M. Cat. No. 2079a-6; I. U. 

 Cat. No. 12265.) 



Fifteen specimens, 50-72 mm. Rockstone. (C. M. Cat. No. 2080a-e; I. U. 

 Cat, No. 12266.) 



Five specimens, 68-83 mm. Crab Falls. (C. M. Cat. No. 2081a-c; I. U. 

 Cat, No. 12267.) 



Two specimens, 80-83 mm. Warraputa. (C. M. Cat. No. 2082; I. U. Cat. 

 No. 12268.) 



Sixteen specimens, 68-160 mm. Konawaruk. (C. M. Cat. No. 2083a-e; I. U. 

 Cat, No. 12272.) 



Head 3 (in the young)-3.4; depth 2.1-2.8 (in the young); D. 11 or 12; A. 

 10-12; scales 14 or 15-50 to 61-8 or 9; eyes a little longer than the snout, 3.3 in the 

 head, 1.75 in the bony interorbital, (1.25 in the young). 



Elliptical, the ventral profile regularly arched, the dorsal profile but little 

 depressed over the head; preventral area obscurely angulated on the sides, post- 

 ventral area trenchant, but with a median series of non-spinous scales; predorsal 

 line scaled, but without a median series of scales; a well-developed adipose lid; 

 mouth terminal, the premaxillary not visible from below; no gill-rakers; palate 

 with a feeble dermal ridge on each side; tongue adnate. 



Dorsal small, truncate, the anterior rays scarcely prolonged, but reaching 

 beyond the tip of the last, its origin nearly in the middle of the length; caudal 

 forked, the lobes a little more than one-fourth of the length; anal emarginate, its 

 base oblique; ventrals not reaching anus, pectorals not to ventrals. 



Scales increasing in size from the dorsal to in front of the ventrals, all of them 

 strongly serrate; fins naked; axillary scale small. Lateral line straight. 



Air-bladder filiform, reaching to the middle of the anal. 



In the description everything but the formulas is derived from the larger 

 specimens. The young fish is much slenderer; the fins are longer, the scales are 

 ciliated on the breast, and the dorsal rarely reaches to the adipose. 



