464 On the Sharks of the Family Scylioihiiiidse. 



Hah. 150 kilometres N.W. of the Hebrides, at a depth of 

 1100 to 1300 metres. 



3. Pristiurus eastmani. 



Pristiurus eastmani, .lord, k Snvd. Smithsori. Coll. xlv. 1903, p, 230, 

 pi. Ix. (1904). 



Hah. Japan. 



In the Britisli Museum one specimen, 300 mm. in total 

 length. 



Garman has recently proposed a new genus Parmaturus 

 (Bull. Mus. Comp. Zool. xlvi. 1906, p. 203) to include anew 

 species, Parmaturus piiosus, from deep water off Japan, 

 in addition to Pristiurus eastmani and Scyliorhinus xaniurus. 



I have examined a specimen of Pristiurus eastmani^ which 

 I regard as congeneric with P. melanostomus. On the other 

 hand, S. xaniurus^ as described, does not appear to differ 

 generically from Scyliorhinus. The systematic position of 

 Parmaturus jyilosics is therefore, at present, uncertain. 



3. PSEUDOTRIACIS. 



Pseudotriacis, Capello, Jorn. Sc. Math. Phys. Lisboa, iv. 18G7, p. 321. 



This genus is distinguished by the numerous small teeth 

 and by the long and low first dorsal fin in advance of the 

 pelvics. 



Two species. 



1. Pseudotriacis m'lcrodon. 



Pseudotriakis microdon, Capello, Jorn. Sci. Math. Lisboa, iv. 1867, 

 p. 321, pi. V. tig. 1 ; Bean, Proc. U.S. Aat. Mus. vi. 1883, p. 147; 

 Jord. & Everm. Bull. U.S. Nat. Mus. xlvii. 1896, p. 27, and 1900, 

 fig. 14. 



Pseudotriacis microdon, Giintb. Cat. Fish. viii. p. 395 (1870). 



Length of head (to last gill-opening) bl in the length of 

 the fish. 



Hah. North Atlantic. 



In the British Museum one example, 1050 mm. in total 

 length. 



This species attains a length of 3000 mm. The skeleton 

 has been well described by Jaquet (Bull. Mus. Monaco, 1905, 

 no. 36) and does not differ notably from that of Scyliorhinus. 

 The secondary calcification of the vertebrie is reduced to a 

 thin peripheral layer, as in Pristiurus (Regan, Proc. Zool. 

 Soc. 1906, p. 745). 



