SHARKS AND RAYS OF BEAUFORT, NORTH CAROLINA. 



261 



Measurements of a Male 2 M. (6 Feet 6K Inches) Long, from Station 10,208 (United States 

 Coast Survey Steamer "Bache"), Mar. 21, 1914. 



■ (Furnished by Mr. W. W. Welsh.) 



Length of anterior pectoral margin 47-0 



Axil of pectorals to base of ventrals 54. o 



Length of ventrals 13-0 



Length of claspers 18. o 



Base of ventrals to origin of anal 19. o 



Length of anterior margin of anal 13. o 



Length of posterior margin of anal 9-0 



Base of anal 7-0 



Anal to lower caudal lobe 12. o 



Length of upper caudal lobe 57.0 



Length of lower caudal lobe 26. o 



Caudal notch to tip of fin 14-0 



Caudal fork to tip of fin 50-0 



Total length 200. o 



Tip of snout to — 



Origin of first dorsal 62. o 



Anterior margin of eye 16. o 



First gill slit 33-0 



Front of mouth i4- o 



Horizontal diameter of eye 2.5 



Distance between nostrils 12-0 



Distance between angles of mouth , 20. 5 



Depth of body at base of first dorsal 32. o 



Base of first dorsal 23-0 



Interdorsal space 44- o 



Base of second dorsal 6.5 



Distance from second dorasl to base of caudal 14.0 



First dorsal broad, upper lobe rounded, height of fin greater than length of base, distal margin 

 sinuous, concave near acuminate lower lobe; second dorsal small, similar in form to the first, but more 

 deeply concave, lower lobe relatively longer; pectorals long, narrow, twice as long as broad, with a 

 distinct basal lobe; claspers elongate; anal larger than second dorsal, distal margin deeply incised, 

 anterior lobe rounded, posterior lobe acuminate; caudal large, its length 3.5 in total length of fish; sub- 

 caudal lobe nearly one-half length of caudal fin. 



Through the courtesy of Mr. Coles, I have been enabled to examine the jaws of the specimen incor- 

 rectly identified as C. milberti (Linton, 1905, p. 341) and the jaws and denticles of a smaller example. 

 These are C. commersonii. Mr. Coles has taken three specimens, the only ones taken on the North 



Carolina coast. 



Genus GALEOCERDO MUller and Henle. The tiger sharks. 



15. Galeocerdo arcticus Faber. 



Galeocerdo tigrinus. Coles, 1914. P- ^9- 



Teeth. — Teeth in (21-25) ° rows; upper and lower teeth similar in form; cusps oblique; anterior 



margins convex, posterior margins incised, with a deep notch and a prominent basal shoulder; tips of 



Fig. 16. — Denticles, Galeocerdo arcticus, 365.8 cm. long, from Beaufort, N. C. 



cusps finely serrate (frequently smooth in functioning teeth), coarsely serrate on basal portion; basal 

 shoulder denticulate, the denticles finely serrate; a median row of smaller, more nearly erect teeth at 

 symphysis of each jaw; the first row and part of the second functioning. 



O' Garman, The Flagiostomia. p. 14S. 



