300 Memoir Sears Foundation for Marine Research 



sexes; anterior part of dorsals prickly; caudal membrane also with a few prickles. Matur- 

 ing males developing additional small thorns along marginal belts abreast of eyes; their 

 alar spines in 3—4 irregular rows. Lower surface smooth, except sometimes prickly along 

 margins of anterior part of tail. 



Snout in front of orbit about 1.3— 1.8 times as long as orbit, its length in front of 

 mouth about twice as great as distance between exposed nostrils. Orbit about 1.5 times 



Figure 68. Bremraja flutonia. A Ventral view of pelvics of female pictured in Fig. 67, about ly.. B Upper 

 teeth of same, about 17 X ■ C Lower side of anterior part of head of male pictured in Fig. 60, about IX- D Right- 

 hand nostril and nasal curtain of same, about 5X. £ Upper teeth of same, about 17 X. 



as long as distance between orbits and about 2.0 times as long as spiracle. Distance 

 between first gill openings 2.3—2.9 times as long as distance between exposed nostrils, 

 1.2 — 1.9 times between fifth gill openings; first gill openings i.i— 1.2 times as long as 

 fifth and about 25 "/o as long as breadth of mouth. Nasal curtain smooth or slightly ir- 

 regular; posterior (outer) margin of nostrils smooth. Mouth only slightly arched cen- 

 trally. 



Teeth Ij^; those of young and of adult females close-set in quincunx, with obscure 

 transverse cutting edge and faintly indicated cusp; those of mature males loosely spaced 

 in transverse series, with narrow conical cusps directed outward toward corners of mouth. 



First and second dorsals similar in size and shape, conflluent at base; caudal mem- 

 brane posterior to second dorsal only about half as long as base of second dorsal. Pelvics 

 deeply concave outwardly; anterior margin about as long as distance from its own origin 



