3 I 8 Memoir Sears Foundation for Marine Research 



between first gill openings 2.1—2.3 times as long as distance between exposed nostrils, 

 I.I — 1.3 times between fifth gill openings; first gill openings i.i— 1.3 times as long as 

 fifth and about Vs as long as breadth of mouth. Nasal curtain with narrow, irregular 

 fringe, posterior (outer) margin of nostril smooth. Mouth nearly straight in females, 

 considerably more arched centrally in adult males. 



Figure 74. Cruriraja atlantis. A Ventral view of pelvics of male pictured in Fig. 73. B Lower side of anterior 

 part of head of same. C Margin of right-hand nasal curtain of same, about 4 X . i) Left-hand nostril of same, 

 about 6.5 X. E Side view of posterior part of tail of same, about 1.3 X. F Upper teeth of same, about 20 X. 

 G Upper teeth of female pictured in Fig. 73, about 20 X. 



Teeth in ^^ series ; those of young and of females to maturity with low blunt 

 cusp, close-set in quincunx, mostly with oval base; those of adult males with long sharp 

 cusp at and near center of mouth, near its corners cusps triangular and bases more oval. 



First and second dorsals similar in shape and about equal in size. Interspace 

 between first and second dorsals about 2.5 times as long as base of first dorsal. Distance 

 from rear end of base of second dorsal to origin of caudal membrane about half as long 

 as base of second dorsal. Caudal membrane about half as long as base of second dorsal. 

 Anterior division of pelvic about equal in length to posterior division; outer margin 

 of posterior division moderately convex, more so in females than in males, and slightly 

 wavy; rear tip angular, reaching back about 1/4 the distance from axils of pectorals 



