LAMNA. FISHES. 385 



This animal, the terror of mariners, is one of the most voracious of fishes. But how- 

 ever large and dangerous the existing race may be, yet, from the magnitude of the 

 fossil teeth found at Malta and elsewhere, some of them measuring 4^ inches from 

 the point to the base, and 6 inches from the point to the angle, the animal to which 

 they belonged must have much exceeded the present species in size. 



C. vulpes, Cuv. The Fox Shark. Body lead-coloured, whitish be- 

 neath ; head short and conical ; upper lobe of the tail as long as 

 the body. 13 feet long. Inhabits Mediterranean and other seas. 

 Shatv, v. 333. 



C. glaucus, Cuv. The Blue Shark. Body slender, slate-blue co- 

 loured above, whitish beneath ; snout long and pointed ; tail 

 deeply bilobed, the lower lobe longer than the upper. 10 to 14 

 feet long. Inhabits all seas. B. Sharv, v. pi. 151. 



Gen. 3. LAMNA, Cuv. Squalus, Gmel. 

 Snout pyramidal, with the nostrils at the base ; teeth numerous, 

 in rows ; branchial openings before the pectoral fins. 



L. Cornubiensis, Cuv. Porbeagle Shark. Body above blackish-blue, 

 white or silvery beneath, with a projecting keel on each side of 

 the tail, and the caudal lobes almost equal ; teeth slender, with 

 two processes at their base ; tail semilunar. 4 to 8 feet long. 

 Inhabits European seas. B. Lin. Trans, iii. pi. 153. 



The L. Monensis does not seem to differ from the present species. 



Gen. 4. ZYG^ENA, Cuv. Squalus, Lin. 

 Head flattened horizontally, truncated before, and its sides pro- 

 longed transversely into branches, like the head of a hammer ; 

 eyes at the extremity of the branches, and the nostrils at 

 their anterior margin. 



Z. vulgaris, Cuv. The Hammer-headed Shark. Body elongated, 

 brown above, whitish beneath ; first dorsal fin falcate, towards the 

 upper part of the back ; second small and near the tail. 5 to 15 

 feet long. Mediterranean and Indian seas. Shaw, v. pi. 154. 



Z. Blochii, Cuv. Nostrils placed nearer the middle, and the second 

 dorsal fin closer to the caudal one than in the preceding. Cuv. 

 Reg. An. ii. 127. 



Z. Tiburo, Cuv. Head flattened, cordiform ; body grayish, belly 

 white, and skin covered with small tubercles. Inhabits European 

 and American Seas. Shaw, v. pi. 154. 



1. With spiracles and anal Jin. 

 Gen. 5. GALEUS, Cuv. Squalus, Lin. 



Body elongated ; snout produced, pointed ; with temporal ori- 

 fices ; teeth dentated on their exterior side ; first dorsal fin 

 nearly above the pectorals. 



G. vulgaris, Cuv. The Common Tope. Body above light cinereous, 

 white below ; fins small and blackish. 5 feet long. Inhabits 

 European seas Penn. Brit. Zoo/. Hi. pi. 18. 



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