92 PROCEEDINGS OF THE ACADEMY OF [1897. 



than snout. Length of snout equal to, or a little less than, half 

 greatest width of disk, equal to distance between outer points of an- 

 terior gill-openings ; interorbital width 4 to 4f- in snout, a little less 

 than length of e) T es and spiracle, but about equal to length of nos- 

 tril ; internasal width equal to orbit; spiracle one-third length of 

 eye, a prominent curved papilla and a slight ridge in its posterior 

 side. Anterior nasal valve with a long slender flap extending 

 across the nostril ; three broad flaps on posterior side. Rostral 

 ridges separate for their entire length, width between them at base 

 equal to width of spiracle. Mouth nearly straight, its width 2| in 

 its distance from snout and equal to distance between inner folds on 

 posterior side of spiracle. Eye 4£ to 51 in snout. Width of body 

 at axil of pectorals 1 1 in snout. Dorsal fins about equal in size and 

 shape, the distance between them 2* times base of first, the distance 

 between the origins of the two fins equal to snout and about equal to 

 distance from axil of pectoral to origin of first dorsal. Sides of tail 

 with a conspicuous fold. Skin above with a fine uniform shagreen, 

 nearly smooth below except near margins of the disk. A series of 

 very small spines above eye and spiracle, one or two minute spines 

 on shoulder girdle ; the largest spines of body situated along median 

 line of back, extending beyond first dorsal; no spine on snout, but 

 in two of the three specimens there is a pair of minute spineless 

 plates near its tip. Color : dusky brown above, about seven faint 

 dusky bars on the side of the tail behind first dorsal, uniform pale 

 below ; large translucent areas on each side of the snout. Back 

 with numerous small light spots, much smaller than pupil, arranged 

 symmetrically but not in the same pattern on the three type speci- 

 mens ; two or three pairs between eyes, a few pairs behind eyes near 

 median line, some below eye, where they approach nearest the mar- 

 gin of disk, usually one or two on median line, sometimes two are 

 confluent, about 40 or 45 pairs in all. Axil of pectoral in one 

 specimen with a dusky blotch on upper side. 



This species is most nearly related to Rhinobatus glaucostigma of 

 the Pacific coast, differing in having a narrow interorbital, narrower 

 body behind disk, and in the very different color. 



The description is based on three specimens, each about 20 inches 



long. 



NARCOBATIDJE. 



5. Narcine brasiliensis (Olfers). Trembler. 



Torpedo brasilicnsis Olfers, Torpedo, 19, 1831 (Brazil). 



Narcine brasiliensis, Jordan & Evermann, Fishes of North America, 77. 



