GYMNOTID.'E. 



129 



backwards. Colour yellowish-brown, with marbled markings ex- 

 tending over the entire back and sides. Fins yellowish-brown, 

 without markings. 



Seba's description and figure are good, and by them the species, 

 which has been overlooked by all other authors, may be readily 

 known. His specimen was 17 in. long. The Parisian one is not 

 quite 11 in. in length. It was procured by Leschenault in the 

 Mona, a river of French Guiana. P. 19 or 20 ; A. 220 or 223 rays. 



Total length 



Diameter of the eye ..... 



Distance between the tip of the snout and the eye 

 „ to the gill-opening .... 



From thence to the anus ..... 



,, to the beginning of the anal fin 



Height of the body ...... 



Transverse diameter of ditto .... 



Length of the pectoral fin ... . 



,, free part of tail .... 



6. Rhamphichthys Mulleri, fig. 4. 



Fig. 4. 



^*w^-tA-V 



B'uujn. The free part of the tail forms the third or fourth part of 

 the total length, and the transverse diameter of the body scarcely 

 exceeds one-third of its height. 



Descr. It is decidedly a more slender species than the preceding 

 one, has a somewhat shorter head, and more lateral eyes. The 

 muciferous pores of the head are less conspicuous, but the skin of 

 the top of the head and round the eyes is granular. Colour pale 

 yellowish-brown, with numerous spots on the sides of the head and 

 under the lateral line. Dorsal aspect of the head and the back of 

 an uniform black ; the fins also are black, with brown rays. P. 20 ; 

 A. 220 rays. 



I am acquainted with a larger and a smaller specimen, both from 

 Cayenne. The dimensions of the larger one are — 



Total length 20-57 in. 



Diameter of the eye 008 ,, 



s 



