RAJIDAE. 79 
prickles or spines on ventral portion of tail; posteriorly a broad patch of prickles 
along middle of pectoral. 
Color in alcohol: — dorsal surface purplish brown; a large gray spot at 
posterior base of pectoral; smaller and fainter spots scattered over dorsal 
surface, also a row around margin of pectoral; ventral surface slaty; mouth, 
nasal flaps, and gill-flaps pale. 
In the cotype the anterior border of the disc is nearly straight, in other 
respects agreeing with the larger specimen. The dorsal surface is covered with 
prickles, these are thickest on tail, middle line of back, between the eyes, in 
front of the eyes, and on the anterior margin of pectoral; fewer in the places 
where there were more in the larger specimen; no prickles on ventral surface of 
body or tail; a slight fold along ventral margins of tail. 
Color in alcohol; dorsal surface purplish brown, scarcely any pale spots 
showing; ventral surface slaty gray; margin of mouth, nasal flaps, gill-flaps, 
tips of ventrals, and claspers pale. 
Measurements of the dorsal surface. 
No. 65641 U. S. N. M. No. 1364 M. C. Z. 
Total length 480 mm. 286 mm. 
Tip of snout to posterior base of pectoral 230 137 
Width of dise 340 185 
Distance from tip of snout to front of eye 67 41 
Distance between eyes 20 15 
Longitudinal diameter of eyes 16 13 
Length of spiracle 15 8 
Height of first dorsal 19 10 
Base of dorsal 16 i 
Height of second dorsal 15 10 
Base of second dorsal 15 8 
Distance between first and second dorsal 9 5 
Posterior end of second dorsal to tip of caudal 16 15 
Distance between posterior bases of pectoral 46 24 
Spines along median dorsal line of tail 33 24 
Spines between first and second dorsal 1 i 
Measurements of the ventral surface. 
No. 65641 U. S. N. M. No. 1364 M. C. Z. 
Distance from tip of snout to vent 240 mm. 136 mm. 
Distance from posterior part of vent to tip of caudal 232 144 
Length of anterior lobe on anterior margin of ventral 52 34 
Distance between anterior base of lobes of ventral 47 31 
Distance from tip of snout to central margin of upper jaw 70 45 
Width of mouth 41 23 
Rows of teeth in upper jaw 30 30 
Rows of teeth in lower jaw 28 28 
