of the Island of Trinidad, W. I. 429 



Anal long, and high, increasing posteriorly. 

 Caudal very deeply forked, and with the lower lobe much 

 longer than the upper. 



Ventrals small, pointed behind. 

 Pectorals moderate, pointed, with the external rays longest. 



This is readily distinguishable from all the allied genera of 

 the sub-family by the slender filament of the operculum, the 

 unequally lobed caudal, the excessively high dorsal, and the 

 anal, which regularly increases in height from the anterior to 

 the posterior end, a character which is hardly possessed by 

 any other fish. 



Nematopoma Searlesii, Gill. 



The body is slender, sub fusiform, with the abdominal outline 

 to the end of the anal much more arched than the dorsal ; the 

 head, from the snout to the occipital crest, forms one fourth 

 of the length exclusive of the caudal, one fifth of the length to 

 the end of the upper lobe of that fin, and one sixth of the 

 length to the end of the filamentary termination of the lower 

 lobe. The eyes are large, their diameters exceeding a third of 

 the head's length as previously measured ; they are separated 

 by more than a diameter from each other, and less than a 

 diameter intervenes between them and the snout. The dorsal 

 commences above the fifth or sixth ray of the anal, and when 

 bent back extends beyond the peduncle of the tail ; its longest 

 rays are five times the length of the base of the fin ; the length 

 of the base of the anal is nearly three and a half times greater 

 than that of the dorsal, but its height is not much greater than 

 half of that fin. The opercular filament is expanded at the ex- 

 tremity, and reaches to a point behind the dorsal. The pecto- 

 rals, extending as far back as the ventrals do, pass beyond the 

 anterior margin of the anal. 



D. 10. A. 26. C. 2. I. 8. 9 I. 4. P. 10. Y. 6. 



The color is the same as in Stevardia albipinnis. 



