212 



Memoir Sears Foundation for Marine Research 



Distance from snout to: ist dorsal 50.5, 49.45 2nd dorsal 68.4, 68.3 ; upper caudal 



80.0, 79.O; pectoral 18.8, 18.5; pelvics 41.2, 39.3; anal 60.2, 60.0. 



Interspace between: ist and 2nd dorsal 1 1.6, 12.3; 2nd dorsal and caudal 7.4, 7.7; 



anal and caudal 9.6, 10.8. 



Distance from origin to origin of: pectoral and pelvics 23.6, 2 1 .7 ; pelvics and anal 



19.2, 20.9. 



S. torrei resembles 5. boa very closely in body form, shape of snout, nostrils and nasal 

 flaps, shape, size and relative position of fins, and in the teeth and dermal denticles. The 

 significant points of difference are as follows: in torrei the mouth is slightly the lower- 

 arched, its height being only about 40 per cent of its breadth as against 50 per cent in boa; 

 in torrei the length of the snout in front of the mouth is slightly less, it being only a little 

 more than half as great as the breadth of the mouth as against about four-fifths in boa; the 

 pectorals of torrei are only a little larger in area than the first dorsal, whereas in boa they 

 are twice as large as the latter j and while the denticles rise steeply from the skin in newly 

 hatched specimens of both torrei and boa, in larger specimens of the former they lie nearly 

 flat and the surface texture of the skin is smoother compared with the pronounced rough- 

 ness of boa. Also, in the male torrei the inner edges of the pelvics are connected to one 

 another and to the ventral surface of the trunk more nearly to their tips than in either boa 

 or in retifer. However, the most striking difference between the species is in the color 



Figure 34. Scyliorhinus torrei, female, 276 mm. long, from Havana, Cuba (Harv. Mus. Comp. 7,oo\., 

 No. 34776). A Dermal denticles, about 30 x. B Apical view of dermal denticle, about 45 x. C Upper and 

 lower teeth from near center of mouth (Nos. 1—4). D Twelfth and thirteenth upper teeth. E Upper nine- 

 teenth tooth. F Lower tenth and eleventh teeth. G Lower eighteenth tooth. C-G, about 9 x. 



