3GG CARCHABIIDJE. 



Snout produced, the distance between its extremity and the mouth 

 being more than the width of the latter. Nostrils midway between 

 the mouth and the extremity of the snout. Teeth ^^ distinctly 

 serrated ; the upper oblique, with a notch at the base of the outer 

 margin ; the lower narrow, nearly erect. Gill-openings somewhat 

 wider than the orbit. Pectorals short, scarcely extending to the end 

 of the dorsal ; the length of their loiuer margin is ttvo-Jtfths of that of 

 the upper. Origin of the first dorsal at a very short distance from 

 the base of the pectorals, its end much more distant from the ven- 

 tral. The second dorsal veri/ small and short, its base being much 

 shorter than that of the anal ; it is opposite to the hind part of the 

 anal. Coloration uniform. 



Tropical parts of the Atlantic. 



a-b. Fourteen inches long. Guyana. Presented by Sir R. Schom- 

 burgk. 



17. Carcharias obscurus. 



Squalus obsciurus, Lesueur, Journ. Ac. Nat. Sc. Philad. 1818, i. p. 223, 



pi. 9. 

 Carcharias (Prionodon) obscurus, Miill. 9f Henle, p. 46 ; Dekay, Nexv 



York Faun. Fish. p. 350, pi. 61. fig. 201 (cop. Lesueur) ; Dum^ril, 



Elasmobr. p. 371. 

 falcipinnis, io! e, Proc. Zool. Soc. 1839, p. 90, 1843, p. 93; 



Trans. Zool. Soc. iii. p. 18. 

 Prionodon obvelatus, Valenc. in Webb Sf Berthel. lies Canar. Poiss. 



p. 103, pi. 26 (bad) ; DumSril, Elasmobr. p. 376. 

 Platypodon obscurus, Gill, Proc. Ac. Nat. Sc. Philad. 1864, pp. 262, 



265. 



Snout obtusely rounded, rather produced, the distance between 

 its extremity and the mouth being somewhat less than the width of 

 the mouth. Nostrils nearer to the mouth than to the extremity of 

 the snout in old examples, and midway in young. Teeth ||^, the 

 upper oblique, distinctly serrated, with a notch in the outer margin ; 

 the lower narrow, lanceolate, minutely serrated, on a broad base. 

 Gill-openings wide, much wider than the orbit. Pectorals falciform, 

 extending beyond the end of the dorsal, the length of their upper 

 margin being nearly four times that of the lower. First dorsal 

 commencing vertically above the middle of the lower edge of the 

 pectoral. Origins of the second dorsal and anal opposite to each 

 other, the former having a shorter base. Caudal fin long, with the 

 upper edge undulated, longer than the distance between the two 

 dorsal fins. Coloration uniform. 



North Atlantic. 



a. Head of a large example, in spirits, 18 inches long and 12 inches 



broad. Madeira. Presented by J. Y. Johnson, Esq. 



b. Fine specimen, 36 inches long. Madeira. Presented by the 



Rev. R. T. Lowe. 



c. Stuffed, 40 inches long. Madeira. Presented by the Rev. R. T. 



Lowe. 



d. Fine" specimen. St. Helena. Presented by J. C. Melliss, Esq. 



