4 GYJINOTIDiE. 



/3. Rhamphosternarchus. ISnotd proiluccd iiito a hng hibe. 

 6. Sternarchus oxyrhynchus. 



Midi. 8f Trosch. Hor. IchtJnjol. iii. p. IG, taf. 2. figs. 1, 2 ; Kmip, Apod. 

 p. 127. 



Snout produced into a long tube, slightly arched downwards, 

 nearly twice as long as the postorbital part of the head. Mouth 

 very small, its length being only twice the diameter of the eye. 

 Vent below the eyes. Anal fin commencing in advance of the gill- 

 opening. The depth of the body is half the length of the head. 

 Uniform brown. A. 205-215. 



Essequibo. 



a. Sixteen inches long. British Guyana. Presented by Sir R. Schom- 

 burgk. 



7. Sternarchus macrostoma. 



Snout produced into a long, nearly straight tube, the small eye 

 being midway between the root of the pectoral and the extremity 

 of the snout. Cleft of the mouth wide, more than half the length 

 of the snout. Mandible jvith a series of fine teeth on each side. 

 Vent somewhat behind the vertical from the eye. Anal fin com- 

 mencing in front of the gill-opening. The greatest depth of the 

 body is two-thirds of the length of the head. Scales on the back 

 and ventral parts very small, those in the middlfi of the side of 

 moderate size. Uniform blacldsh bi'own, posterior part of the anal 

 and caudal black with whitish margins. A. 202, 



Upper Amazons. 



a. Fourteen inches long. Xeberos. From Mr. Bartlett's Collection. 



8. Sternarchus mormyrus. 



Steindachncr, Sitzysber. Ak. Wiss. Wien, 1868, Iviii. p. 253, taf. 1. 

 fig. 3. 



Snout produced into a long tube, which is bent downwards ; the 

 very small eye midway between the extremity of the snout and the 

 root of the pectoral. Mouth very narrow, its cleft scarcely twice as 

 long as the diameter of the eye. Vent in advance of the eye. A. 

 210-230. The greatest depth of the body is contained once and 

 three-fifths in the length of the head. 



Upper Amazons. 

 a. Adult (tail IcJt, body 2| inches deep). Peruvian Amazons. 

 From Mr. Bartlett's Collection. 



2. EHAMPHICHTHYS. 

 Rhamphichthys, Midi. ^ Trosch. Hor. Ichthyol. iii. p. 15. 

 Caudal fin none. Teeth none. No trace of a dorsal fin. No free 

 orbital margin. 



Braail and Guyanas. 



The species may be divided into two subgenera : — 



