EEOM THE EIO JTJEUA. 427 



CLUPE1D.E. 



41. Cetexgraulis juruensis, sp. n. (Plate XLT. fig. 3.) 



Depth of body 5 times in total length, length of head 3^ times. Snout very strongly 

 projecting, a little shorter than diameter of eye, which is 5 J times in length of head 

 and If in interorbital width ; jaws toothless ; maxillary extending to articulation 

 of mandible ; cleft of mouth nearly | length of head. Gill-rakers long, finely denti- 

 culate, about 40 on lower part of anterior arch. Dorsal 13, originating at equal 

 distance from end of the snout and base of caudal. Pectoral a little more than \ 

 length of head, extending a little beyond base of ventral. Anal 23, originating below 

 posterior rays of dorsal. Caudal peduncle twice as long as deep. Caudal deeply 

 forked. Scales 38 in a longitudinal series, 10 in a transverse series. Olive above, 

 silvery on the sides and below ; snout blackish above ; fins pale orange, caudal rays 

 blackish at the end. 



Total length 140 millim. 



A single specimen. 



This fish, the first freshwater representative of the genus Cetengraulis, is nearest 

 to C. edentalus Cuv., which differs in the deeper body. 



42. Pristigaster catanus Cuv. 



OSTEOGLOSSIDrE. 



43. Arapaima gigas Cuv. 



Dr. Bach has shown me the photograph of a large specimen taken by him. 



GYMNOTIDJ3. 



44. Sternarchus nattereri Stdr. 



45. Sternarchus macrolepis Stdr. 



46. Sternarchus oxyrhynchus M. & T. 



47. Sternarchus tamandua, sp. n. (Plate XL1I.) 



Snout produced into a long, nearly straight tube, the length of which equals 4 times 

 its least depth ; mouth very small, with several rows of minute teeth ; eye extremely 

 minute, a little nearer the opercular cleft than the end of the snout. Depth of body 

 half length of head. A very strongly developed adipose fin runs along the whole 

 length of the body, from which it is easily detached. Pectoral f length of head. 

 Vent under the chin. Anal 220, originating a little in advance of gill-opening, longest 

 rays rather more than A depth of body. Scales very small, larger on the upper half of the 

 body than on the lower ; lat. 1. 85. The tail, in the unique specimen, has been injured 

 during life, and bears a short, regenerated caudal fin. Uniform yellowish white. 



Total length 400 millim. 



