Fishes of the Western North Atlantic 215 



functional; tail sector of trunk considerably longer than body sector; caudal axis raised 

 but slightly, if at all; anal much longer than 2nd dorsal, separated from caudal by a 

 considerable interspace. 



Remarks. Sharply diagnostic of this genus as contrasted with all other scyliorhinids 

 are the presence of the caudal crest and the wide separation of the nostrils from the mouth 

 and from each other in combination with the presence of a labial fold on each jaw, the 

 absence of a barbel and the absence or rudimentary state of the posterior nasal flap. 



Range. Mediterranean; eastern North Atlantic northward to Norway; Iceland; 

 Madeira; Cuba and southern Florida in the western Atlantic; Japan; Formosa; Australia. 



Key to Species 



I a. Ventral margin of caudal peduncle, as well as anterior part of dorsal margin of caudal 

 fin, with a conspicuous crest of modified denticles. hoardmam Whitley, 1928. 



Australia. 



lb. Denticles along ventral margin of caudal peduncle not modified to form a crest. 



2a. Tip of anal falls short of a vertical line at rear end of base of 2nd dorsal by a 

 distance about equal to that from eye to spiracle. 

 3a. Base of 2nd dorsal nearly twice as long as that of ist dorsal. 



murinus Collett, 1905. 



Iceland. 



3b. Base of ist dorsal only about as long as that of 2nd dorsal. 



eastmani Jordan and Snyder, 1904. 



Japan. 



2b. Tip of anal extends rearward nearly or quite as far as rear tip of 2nd dorsal. 

 4a. Trunk plain-colored. 



5a. Interspace between anal and caudal about as long as snout in front of 

 mouth. jfl«/m* Jordan and Richardson, 1909. 



Formosa. 



5b. Interspace between anal and caudal less than V2 as long as snout in front 

 • of mouth. /<?»j^«iSaemundsson, 1922. 



Iceland. 

 4b. Trunk marked with conspicuous dark stripes, spots or blotches. 



6a. Interspace between anal and caudal at least ^/'o as long as base of anal; 

 base of anal only about twice as long as that of 2nd dorsal. 



<zr«^ Nichols, 1927, p. 216. 

 6b. Interspace between anal and caudal only about Vi as long as base of anal; 

 base of anal about 3 times as long as that of 2nd dorsal. 



W(9/tf.f/ow«J Rafinesque, 18 10. 



Eastern North Atlantic, Mediterra- 



4. Perhaps including hertijAgi Englehard, 191 2, Japan, the description of which is not sufficiently detailed for us to 

 locate it more precisely in this key. 



