O GTMNOTID^. 



Sternopygus microstomus, Eeinh. Vidensk. Meddel. naturh. Foren. 



Kjobmh. 1852 (1853) ; or Wiegm. Arch. 1854, p. 181. 

 virescens, Kaup, Apod. p. 137 ; Steindachner, I. c. p. 260. 



Orbit without free eyelid. Eye of moderate size, about one-half 

 of the length of the snout. Mouth very narrow, the length of the 

 maxillary being about equal to the diameter of the orbit. Upper 

 jaw overlapping the lower. Anal fin commencing below the pec- 

 toral, sometimes below its middle, sometimes nearer to its root. 

 Brown. 



Brazil and Guyanas. 



a. Adult (14 inches). Surinam. Collected by Hr. Kappler. 



6-0. Half-grown. Lagoa Santa. Presented by Prof. Reinhardt. 



— Typical of St. microstomus. 

 d-e. Half-grown. Xeberos. Collected by Mr. Edw. Bartlett. 

 f-g. Adult. River Parana. Prom the Haslar Collection. 

 h. Adult. From the Haslar Collection. 

 i, k. Half-grown. From the Collection of Dr. van Lidth de Jeude. 



3. Sternopygus axillaris. 



Orbit without free eyelid ; its diameter is one-half of the length 

 of the snout and two-thirds of the width of the interorbital space. 

 Mouth of moderate width, obliquely directed upwards, with the jaws 

 even in front when the mouth is closed ; maxillary twice as long as 

 orbit. Upper profile of the nape and head nearly straight and hori- 

 zontal. Vent opposite the posterior rim of the orbit. Pectoral fin 

 at least as long as the postorbital portion of the head. Anal fin 

 commencing below the hinder third of the pectoral. The length 

 of the head is nearly equal to the height of the body, and contained 

 seven times and a half in the length to the end of the anal. Scales 

 very small, A large blackish blotch on the commencement of the 

 lateral Hne. A. 212. 



Para. 



a. Fifteen inches long. (Named Carapus macrourus, Cuv., by Dr. 

 Kaup.) 



4. Sternopygus troschelii. 



Sternopygus virescens, Milll. ^ Trosch. I. c. p. 14 (not Valmc). 

 troschelii. Kaup, Apod. p. 139 ; Steindachner, I. c. p. 260. 



Orbit without free eyelid. Eye of moderate size, about two-fifths 

 of the length of the snout. Mouth of moderate width, the length of 

 the maxillary being equal to twice the width of the orbit. Lower 

 jaw longer than the upper. Anal fin commencing below the root of 

 the pectorals. Coloration uniform. A. 230. 



British Guyana. 



4. CARAPUS. 



Carapus, sp. Cuv. Rbgne Anim. 



Carapus, Mull, fy Trosch. Hor. Ichthyol. iii. p. 13. 



Caudal fin none ; no trace ot a dorsal fin. A series of conical 



