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, niiddle 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. 



Total length 



Tip of snout to posterior base of pectoral 



Width of disc 



Distance from tip of snout to front of eye 



Distance between eyes 



Longitudinal diameter of eyes 



Length of spiracle 



Height of first dorsal 



Base of dorsal 



Height of second dorsal 



Base of second dorsal 



Distance between first and second dorsal 



Posterior end of second dorsal to tip of caudal 



Distance between posterior bases of pectoral 



Spines along median dorsal line of tail 



Spines between first and second dorsal 



Measurements of the ventral surface. 



No. 65641 U. S. N. M. No. 1364 M. C. Z. 



Distance from tip of snout to vent 



Distance from posterior part of vent to tip of caudal 



Length of anterior lobe on anterior margin of ventral 



Distance between anterior base of lobes of ventral 



Distance from tip of snout to central margin of upper jaw 



Width of mouth 



Rows of teeth in upper jaw 



Rows of teeth in lower jaw 



