OYMNOTID.^. 139 



From the ]X)iiit of the mandible to the anus . . 0-83 in. 



Height of the boily • . 087 „ 



Thickuess of ditto 0-24 „ 



Lake Aimicu, in British Guiana. A specimen was presented to 

 the Berlin Museum by Sir llobert Schomburgk. The origin of the 

 specimen in the Paris Museum is not noted. 



17. Sj'eknopygus TRosciiEi.r. 



Steruopygus virescens, Midi. lO TroscJi. I. c. 14. 



Diai/ii. This is the longest and most slender species, with the 

 largest mouth, and a mandible exceeding the upper jaw in length. 



Descr. Tlie length of the snout measured from the pupil of the 

 eye equals the height of the expanded mouth. Anus somewhat pos- 

 terior to the gill-opening. Tail running out in a hair-like point to 

 thrice the length of the body, and the head, measured to the nape, 

 is equal to one- nineteenth of the total length. 



British Guiana. A specimen exists in the Berlin Museum, ob- 

 tained from Sir Robert Schomburgk. The origin of the Parisian 

 example is not noted, but it came, probably, from the same quaiter. 



Genus 4. CABAPUS, Miill. ctTrosck. 



Carapus partim, Cuvier. 



Dicujn, Flatly compressed laterall3^ A row of j)ointed teeth ou 

 the snout. Body scaly. 



Vescr. Front nostril situated in a notch near the corner of the 

 mouth in a short tube ; hinder orifice appearing distinctly before 

 the eye. Eyes showing beneath the skin. Branchiostegals five, 

 flat and broad. Anal fin reaching nearly to the end of the tail. 

 Scales along the back and on the lateral line equally large. Under 

 lip longer than the upper one. 



18. Carapus fasciatus. 



Carapus fasciatus, Miill. d Trosch. p. 13. 

 Gymnotus fasciatus. Pall. Sjiicel. Zool. vii. p. 37. 

 Gymuotus brachyurus, BL 157, I. 

 Gymnotus carapo, Bl. <& Schn. 5Jil. 

 Carapus brachyurus et fasciatus, Cuv. Re(j. An. ii. 357. 

 Carapus inaequilabiatus, Valenc. T)'Oihi(jn. Vo>j. pi. 14 ; Seha, iii. 

 t. 3;>, No. 1. 



Diagn. Having about twenty-one oblique blackish cross bars. 



Descr. A more abbreviated roundish species than the following 

 one. The cross bars near the back are narrower, and often break 

 up into round spots, or split into forks above the anal (in. The 



