68 ON FISHES PROM RIO JANEIRO. [May 12, 



in the jaws being large and pointed, and the palatines having a 

 single series of strong teeth. The scales are small, regularly 

 arranged, deciduous; all the species have a strong opercular 

 spine, and in none is a spine on the snout developed. 



Genypterus brasiliensis, sp. n. (Plate YIII, fig. 2.) 



Depth of body about 7 times in total length, length of head 

 about 4^ times. Snout a little longer than eye, the diameter of 

 which is 5-6 times in the length of head, interorbital width 

 about 7 times. Lower jaw shorter than upper; maxillary ex- 

 tending beyond posterior margin of eye, the width of its distal 

 extremity equal to diameter of eye. Scales on upper surface of 

 head extending as far as posterior margin of eye ; cheeks and 

 opercles scaly ; interorbital space, snout, and jaws naked; 15-18 

 rows of scales between anterior dorsal i-ays and lateral line. 

 About 8 gill-rakers on lower part of anterior arch, the upper 

 of moderate length, graduating to rudiments below. Dorsal 

 beginning above posterior third of pectoral when laid back ; 

 pectoral 3 times in length of head, posterior ray of ventral twice. 

 Greyish above, silvery below. 



Description based on five examples from Rio Janeiro, the largest 

 440 mm. in total length. 



Apparently no species of this genus has hitherto been described 

 from the Atlantic coast of America. In all other species the 

 dorsal commences above the middle of the pectoral when laid 

 back. 



PLEURONECTIDiE . 



SoLEA FONSECENCis GUnther. 



The occuiTence of this species at Rio Janeiro is interesting, as 

 it has been previously recorded only from the Pacific coast of 

 Mexico and Central America. I have carefully compared the 

 single example in Dr. Goeldi's collection with others from the Gulf 

 of Fonseca and the Rio Presidio, and am unable to detect the 

 least difierence between them. 



LOPHIID^. 

 LOPHIUS PISCATORIUS Limi. 



A small specimen from Rio Janeiro is exactly similar to others 

 of this species from both sides of the North Atlantic. 



EXPLANATION OF THE PLATES. 

 -. Plate VII. 



Mylacrodon goeldi (Xf), p. 63. 



Plate V in. 

 Fig. 1. Peristedion altipinnis (Xj), p. 65. 

 2. Gen^jitertis hrasiliensis (Xi), p. 68. 



