Ko. 1694. TWO NEW ELECTRIC RAYS— BEAN AND WEED. Q'JQ 



Color of dorsal surface, light fawn-color, with a few scattered white 

 sjwts about 1-2 mm. in diameter. The color becomes lighter toward 

 the edges of the body and fades graduall}' into the dirtj' white of the 

 belly. 



Ti/pe.— Cat Xo. G291C., U.S.N.M. 



3Iarcida, loose, soft, lacking substance, 



BENTHOBATIS CERVINA Bean and Weed, new species. 



Disk considerably narrower than long, its width 2.5 cm. (one- 

 sixth) less than the distance from tip of snout to end of pectoral 

 fins; this is somewhat wider than is represented in the figure of B. 

 moreshyi; length of disk slightly less than half of total length; ej'es 

 situated about 0.7 cm. in advance of the spiracles and much less re- 

 duced than in B. moreshyi and B. mavcida; they may be slightly 

 functional as the orbit seems to be somewhat developed ; the external 

 opening is about 1 mm. in length. Teeth rhombic, arranged in quin- 

 cunx, occupving nearly the whole width of the jaw and each tooth 

 has the surface flat or concave with a sharp point projecting back- 

 ward. 



Ventral fins about as represented in B. moreshyi; second dorsal 

 much larger than the first and the caudal well developed evenlj" 

 above and below with posterior margin rounded. In B. moreshyi 

 the first dorsal is represented as being much larger than the second. 



Nasal valves confluent, forming a quadrangular curtain; an electric 

 battery on each side between head and pectoral fins. 



Total length - [^f'^ 



1(13 li 



Mcasiircinciits. ^"'■ 



33.0 

 1(13 lu.) 



Total length without caudal 27. 5 



Length to end of ventral fins 20.0 



Length to end of pectoral fins 15. .5 



Length to origin of first dorsal IS. 8 



Length to origin of second dorsal 21.7 



T-ength to spiracles 6.0 



I-ength to nostrils 4.5 



Length to first gill slit 7. S 



Length to last gill slit 10.3 



Length to mouth 5.8 



Length to vent 16.3 



Vent to end of caudal 16. 7 



Width across pectorals 13.0 



Width across ventrals 9.8 



Width between spiracles -2.6 



Width between nostrils 2.5 



Width of mouth 1.5 



Width between first gill slits , 4.5 



Width between last gill slits 3.5 



Length of gill slits about 0.6 



Length of first dorsal base 1.6 



