4. GALKOCERDO. 377 



tircly behind, the anal. Caudal fin long, nearly one-third of the 

 total length. 

 Indian Ocean. 



a-b. Young, 1 4 inches long. Seychelles. From Prof. E. P.Wright's 

 Collection. 



Very closely allied to Carcharias glaucus. 



4. GALEOCERDO. 



Galeocerdo, Miiller 8f Hade, p. 59. 



The first dorsal fin opposite to the space between the pectorals and 

 ventrals, without spine. Caudal fin with a double notch. A pit on 

 the tail, above and below, at the commencement of the caudal fin. 

 Membrana nictitans present ; pupil of the eye rounded. Small 

 spiracles. Mouth crescent-shaped. Teeth subequal in both jaws, 

 oblique, serrated on both margins, with a deep notch on the outer 

 margin. 



Arctic, temperate, and tropical seas. 



1. Galeocerdo arcticus. 



Squalus arcticus, Faher, Fisch. Isl. p. 17; Nilss, Skand. Faun. Fisk. 



p. 717; Kroyp.r, Damn. Fisk. p. 933. 

 Galeocerdo arcticus, Midi. i§- Heme, p. 60, pi. 24 ; Dum6rU, Elasmobr. 



p. 394. 

 Boreogaleus arcticus, Gill, Ann. Lye. Nat. Hist. New York, vii. p. 411. 

 Teeth : H^rissnnt, Ac. Sc. 1749, p. 158, pi. 9 ; Lacep. i. pi. 8. fig. 4 ; 



Blake, Dent. Form, et Struct, tab. 6. fig. 5; Ay ass. Poiss.'Foss. 



tab. E. figs. 5 & 6 (Galeus cepedianus) ; Owen, Odontogr. tab. 28. 



fig. 9 (Galeus). 



The length of the caudal fin is one-fourth of the total, and equal 

 to the distance between the two dorsal fins. The length of the 

 prseoral part of the snout is much less than the distance between 

 the inner angles of the nostrils. A labial fold along a part of the 

 upper jaw. Second dorsal fin scarcely in advance of the anal. 

 Coloration uniform. 



Arctic seas. 



a. Stuff'od, 10| feet long. From the Haslar Collection. 

 h-d. Jaws of very large examples. 



2. Galeocerdo rayneri. 



Galeocerdo tigrinus, Gray, Chondropt. p. 64. 



rayneri, Mac Donald c^- Barron, Pivc. Zool. Soc. 18G8, p. 368, 



pi. 32' (not good). 



The length of the caudal fin is a little more than one-fourth of 

 the total, and not quite ccjual to the distance between the two 

 dorsal fins. The length of the praeoiJil part of the snout is much 

 less than the distance between the inner anfflefs of the nostrils. A 



