222 Memoir Sears Foundation for Marine Research 



Afristurus frojundorum (Goode and Bean), 1 895 

 Figure 38 



Study Material. Type specimen, mature male, 510 mm. long, taken off Delaware 

 Bay in 816 fathoms (U.S. Nat. Mus., No. 35646) j newly hatched male, 145.5 mm.., from 

 a nearby locality (U.S. Nat. Mus., No. 83894). 



Distinctive Characters. The adult profundorum is separated from riveri by its con- 

 siderably smaller second dorsal relative to the first dorsal, shorter snout relative to length 

 of head, smaller eye, much shorter gill openings, relatively broader mouth and much 

 shorter caudal 5 from atlanticus by its relatively smaller eye, shorter caudal, and by the fact 

 that the tips of the pelvics are closer to the tip of the caudal than to the tip of the snout. 

 But it may be difficult to distinguish newly hatched specimens of the three species from 

 one another. 



Figure 38. Afristurus frofumlorum, female, 510 mm. long, from off Delaware Bay (U. S. Nat. Mus., 

 No. 35646, type). A Head of same from below. B Dermal denticles of same, about 12 x. C Newly hatched 

 male, 146 mm. long, from off Delaware Bay (U. S. Nat. Mus., No. 83894). D Head and pectorals of same 

 from below, about 1. 1 m. E Gill openings of same, about 4 x. 



Description. Proportional dimensions in per cent of total length. Male, 510 mm., 

 from Lat. 39° N., Long. 72° W. (U.S. Nat. Mus., type. No. 35646). 

 Trunk at origin of pectoral: breadth i i.O; height 9.2. 

 Snout length in front of: mouth 8.9. 

 Eye: horizontal diameter 2.7. 

 Mouth: breadth 8.45 height 2.9. 

 Nostrils: distance between inner ends 4. i . 

 Labial furrow lengths: upper 2.95 lower 3.5. 

 Gill opening lengths: ist 1.85 5th 1.3. 



