17. PSEUDOXRIACIS. 'i^Jo 



Monstrosities : — 



Squalus rashleigh.amis, Couch, Trans. Linn. Soc. xiv. p. 01. 

 Polyprosopus (!) raslilcif^lianus, Couch, Hist. Ihit. Fish. i. p. (>7, pi. 15. 

 macer, Couch, ibid. 



The gill-openings extend from the back nearly to the median line 

 of the throat. 



Attains to a length of more than 30 feet. Arctic seas ; occa- 

 sionally as far south as the coasts of Portugal and New Jersey. 



I insert here, for the present, a genus the natural affinities of 

 which appear to be with the Mustelina ; but as it is said to lack a 

 nictitating membrane, I am compelled to remove it from that group. 



17 PSEUDOTRIACIS. 



Pseudotriakis, Capello, Jorn. Sc. Math. Phys. e nat. Lisboa, iv. 1867. 



Two dorsal fins, without spines, the first very low and long, op- 

 posite to the space between the pectorals and ventrals. No pit at the 

 root of the caudal fin (?), which is without lower lobe. An anal fin. 

 No membrana nictitans. Spiracles bcliind the eye. Mouth crescent- 

 shaped, with a very short groove at the angle of the mouth. Teeth 

 very small, pointed, with small lateral cusps. Gill-openings rather 

 narrow. 



Coasts of Portugal. 



1. Pseudotriacis microdon. 



Capello, I. c. pi. 5. tig. 1. 



The first dorsal fin terminates in front of the ventrals, the second 

 opposite to and as large as the anal. Length of the moutli rather 

 more than that of the snout. Nostrils nearly on the same level with 

 the front margin of the mouth. {Cajjdlo.) 



Portu{>:al. 



