3.G-i CARCUAEIID^. 



two"iifths of that of the upper ; the second dorsal shorter than the 



anal 10. porosus, p. 365. 



one-fourth of that of the upper. Gill-openings much wider than orbit. 



17. obscurus, p. 36G. 

 two-sevenths of that of the upper. Gill-opening3 as wide as orbit. 



18. sorrah, p. 367. 

 two-fifths of that of the upper ; the second dorsal not much smaller than 



anal 19. dmsumieri, p. 367. 



/3^. Snout veiy short and obtuse. 

 Coloration uniform ; upper teeth with the notch very indistinct. 



20. gmigcticus, p. 307. 

 Coloration uniform ; upper teeth distinctly notched. 



21. amblt/rhinchm, p. 368. 

 Body with dark transverse spots 22. fasciatus, p. 368. 



bb. Origin of the first dorsal conspicuously distant from the root 

 of the pectorals. 



Fins without ornamental colours 23. brachi/wus, p. 309. 



All tlie fins with black extremities 24. melanopterus, p. 369. 



Pectoral and caudal with black extremities, but no black on the first 



dorsal 25. hleeheri, p. 370. 



Margins of the fins of a pure white 26. alhomarginatus, p. 370. 



j3. The lower teeth without serrature. 

 The second dorsal entirely opposite to the anal. 



27. menisorrah, p. 371. 

 The anal fin in advance of the second dorsal. 28. borncensis, p. 371. 

 6. The upper teeth not conspicuously oblique, serrated, broad, regularly 

 triangular. 

 u. The lower teeth like the upper .... 29. amboinensis, p. 372. 

 ji. The lower teeth narrow, on a broad, two-rooted base, serrated. 

 The second dorsal smaller than the anal. ... 30. lamia, p. 372. 

 The second dorsal rather larger than the anal. 



31. ylyphisj p. 373. 



c. The upper teeth erect, rather narrow, on a two-rooted base, serrated; 



the lower of a similar form. 



The extremities of most of the fins black . . 32. limbatus, p. 373. 

 Fins without black 33. j'ieuroteenia, p. 374. 



d. The upper and lower teeth slender, numerous. 



Teeth |^ 34. tevmiinckii, p. 374. 



Teeth ^ 3o. o.ryrhijnchus, p. 375. 



14. Carcharias glaucus. 

 Blue Shark. 

 Galeus glaucus, Rondel, p. 378; Gcsncr, Be Aqiuit. p. 609; Aldrov. 



p. 394 ; WilltKjhby, p. 49. 

 Squalus, sp., Artedi, Synon. p. 98. no. 13, and Gen. p. CO. no. 13. 

 Squalus glaucus, L. Syst. Nat. i. p. 401 ; Bl. taf. 80 ; Lacep. i. p. 213; 



JJl. Schn. p. 131 ; Eisso, Ichth. Nice, p. 2(; ; Tnrt. Brit. Faun. p. 113 ; 



Jenyns, M<in. p. 499 ; Bonap. Faun. Hal. Peso. 

 Blue 'shark, Waltson, Phil. Trans. Ixviii. pt. 2. p. 789, pi. 12; Pemi. 



Brit. Zool. iii. p. 95, or, cd. 1812, iii. p. 143; Coiiv/i, Fish. Brit. 



Id. i. p. 28, pi. •;. 



