S/mrlcs of the Family Squalidse. 55 



Lamargus boreaKs, Miill. & Henle, Plagiost. p. 93 (1841) ; Dum^ril, 



Elasmobr. p. 455, pi. v. figs. 1 & 2 (18G5) ; Giinth. Cat. Fish. viii. 



p. 426 (187U). 

 Sormiiostis microcephaluti, Jord. & Everm. Bull. U.S. Nat. Mus. xlvii. 



1896, p. 57 ; Jord. & Fowler, Proc. U.S. Nat. Mus. xxvi. 1903, 



p. 638. 



First dorsal equidistant from the bases of the pectoral and 

 pelvic tins. 



IJab. Arctic seas, southward to Japan, Oregon, Cape Cod, 

 and France, 



In the British Museum three specimens, 1800 to 4500 mm. 

 in total leuo'th. 



2. Somniosus rostratus. 



Scymnus rostratus, Tlisso, Eur. Merid. iii. p. 138, fig. 7 (1826). 

 L(B7nargus rostratus, Oanestrini, ]Mem. Accad. Sc. Torin. xxi. 1865, 



p. 364, pi. ii. fig. ; Giinth. Cat. Fish. viii. p. 427 (1870); Helbing, 



Nov. Act. Acad. Germ. Ixxxii. 1904, p. 335. 



First dorsal nearer to the base of the pectoral than to that 

 of the pelvic fins ; body more elongate than in S. micro- 

 cephalus. 



IJab. Mediterranean. 



In the British Museum one specimen, 800 mm. in total 

 length.' 



11. ISISTIUS. 

 Isistius, Gill, Proc. Ac. Philad. 1864, p. 264. 



A single species. 



1. Isistius hrasiliensis. 



Sct/mnus hrasiliensis, Quoy & Gaim. Voy. 'Uranie,' Zool. p. 198 (1824) ; 



Miill. & Ilenle, Plagiost. p. 92 (1841); Dumeril, Elasmobr. p. 453 



(1865). 

 Isistius brasiliensis, Gill, Proc. Ac. Philad. 1864, p. 264 ; Giinth. Cat. 



Fish. viii. p. 429 (1870) ; Garm. Mem. Mus. Comp. Zool. xxiv. 1899, 



p. 34, pi. i. tig. 1. 

 Leiusferox, Kner, Denlischr. Ak. Wien, xxiv. 1865, p. 10, pi. iv. fig. 2. 



IJab. Tro[)ical and subtropical seas. 



In the British Museum four specimens, 150 to 230 mm. in 

 total length. 



12. EUPROTOMICRUS. 

 Buprotomicrtis, Gill, Proc. Ac. Philad. 1864, p. 264. 

 A single species. 



