190 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 99 



The following counts were made on the above-listed specimens: 

 Dorsal rays, four counts for 78, one for 79, two for 80, one of 83; 

 anal rays, one count each for 56, 58, 59, two counts each for 60 and 

 61, one for 62. 



Genus ETROPUS Jordan and Gilbert 



Etropus Jordan and Gilbert, Proc. U. S. Nat. Mus., vol. 4, p. 364, 1882. (Geno- 

 type, Etropus crossutus Jordan and Gilbert.) 



ETROPUS LONGIMANUS Norman 



Etropus longimanus Norman, Ann. Mag. Nat. Hist., ser. 10, vol. 12, p. 202, 

 1933 (C. Frio, Brazil). 



The following small specimen is identified as this species with un- 

 certainty: 



U.S.N. M. No. 123142, 1 specimen, 36 mm., south coast of Gulf of Venezuela, 

 U. S. S. Niagara, November 15, 1924. 



ETROPUS DELSMANI Chabanand 



Etropus delsmani Chabanaud, Bull. Mus. Nat. Hist. Nat., ser. 2, vol. 12, p. 149, 

 1940 (Isla de Santa Margarita). 



Suborder Soleiformes 

 Family ACHIRIDAE: Tonguefishes; Soles; Lenguados 



KEY TO THE GENERA AND SPECIES REPORTED FROM VENEZUELA 



la. Interbranchial septum between the right and left gill chambers perforated 

 by a roundish opening (fenestra) posteriodorsally. 

 2a. Gill membranes fused with the hyoid, internally and above the pelvic arch, 

 anteroventrally to the fenestra; nasal spine not projecting through the 

 skin in front of tubular nostril; posterior dorsal side of gill opening on 

 blind side with a double membranous flap of skin fringed with cirri along 

 both edges; pectoral fin of one to four short rays; a deep pit on blind side 

 above upper jaw a short distance in front of tubular nostril. 



Hypoclinemus mentalis (Giinther) 

 26. Gill membranes not fused to the hyoid-pelvic region, entirely free ventrally; 

 nasal spine projecting through the skin, in front of tubular nostril; 

 posterior dorsal edge of gill opening on blind side with a single fringed 

 membranous flap of skin; pectoral fin well developed, of about 5 rays; 

 no deep pit on blind side above maxillaries and a short distance in front 



of tubular nostril Achirus achirus maculipinnis (Agassiz) 



16. Interbrancliial septum not perforated; gill membranes free from h3'oid region; 

 nasal spine not projecting through the skin in front of tubular nostril; 

 posterior dorsal side of gill opening on blind side with a single free fringed 

 dermal membrane; pectoral fin absent or with one short ray; practically no 

 depression or pit above maxillary and in front of tubular nostril on blind 

 side Trinectes raaculatus brownii (Giinther) 



Genus HYPOCLINEMUS Chabanaud 



Hypoclinemus Chabanaud, Bull. Inst. Oceanogr., No. 523, p. 32, 1928. (Geno- 

 type, Solea mentalis Giinther, fixed by Myers, Copeia, No. 171, p. 37, 1929.) 



