54 Mr. C. T. Regan on the 



12. Centrophorus tessellatus. 

 JJab. Japan. 



Centrophorus tessellatus, Garm. Bull. Mus. Comp. Zool. xlvi. 1900, 

 p. 205. 



13. Centrophorus moluccensis. 



Cetitrophorus moluccensis, Bleek. Act. Soc. Sc. Indo-Neerl. viii., Am- 

 boyna, p. 3 ; Giinth. Cat. Fish. viii. p. 421 (1870). 



JJab. Amboyna. 



In the British Museum one specimen, 210 mm. in total 

 length, type of the species. 



9. SCYMNORHINUS. 



Scymnorhinus, Bonap. Cat. Pesc. Europ. p. 16 (183G). 

 Dalatias * , Gray, Chondropt. p. 75 (185l). 



This genus differs from Scymnodon in the absence of fin- 

 spines and in having the lower teeth finely serrated. 

 A single species. 



Scymnorhinus lichia. 



Squalus licha, Bonnaterre, Encycl. Ichth. p. 12 (1788). 



Scymnus lichia, Cuv. Regne Anim. ed. 1, p. 130 (1817) ; Mull. & Heule, 



Plagiost. p. 92 (1841) ; Dumenl, Elasmobr. p. 452 (1865); Giinth. 



Cat. Fish. viii. p. 425 (1870). 

 Dalatias lichia, Grav, Choudropt. p. 75 (1851) ; Jord. & Fowler, Froc. 



U.S. Nat. Mus. xxvi. 1903, p. 637. 



JJab. Mediterranean and neighbouring parts of the At- 

 lantic; Japan. 



In the British Museum nine specimens, 520 to 1280 mm. 

 in total length, including one from Japan. 



10. SOMNIOSUS. 



Somniosus, Le Sueur, Journ. Ac. Philad. 1818, p. 222. 

 Lcemargus, Mull. & Heule, Plagiost. p. 93 (1838). 



Two species. 



1. Somniosus microcephalia. 



Squalus microcephalics, Schneid. Bloch's Syst. Ichth. p. 135 (1801). 

 Squalus horealis, Scoresby, Arct. Beg. i. p. 538, pi. xv. figs. 3 & 4 (1820). 



* Dalatias sparophagus, described and figured by Rafinesque, was 



ftrobably either Scymnorhinus lichia or So?nniosus rostratus. Dalatias, 

 ike Etmopterus, may be regarded as a nomen nudum. 



