386 FISHES. CYCLOSTOMI. 



Gen. 6. M-USTELUS, Cuv. Squalus, Lin. 



Body elongated ; snout blunt ; with temporal orifices ; teeth 

 blunt and crowded ; dorsal fins unarmed. 



M. vulgaris, Cuv. (Sq. mustelus, Lin.) Body brownish above, 

 whitish beneath ; pectoral fins short ; first dorsal fin large, and 

 placed nearly in the middle of the back, the second nearly oppo- 

 site the anal fin. 2 feet long. European seas. Shaw, v. pi. 153. 



Gen. 7. NOTIDANUS, Cuv. Squalus, Lin. 



Head small, depressed, and obtuse, with temporal orifices ; teeth 

 compressed and serrated ; dorsal fin single. 



N. griseus, Cuv. Body pale brown, with small carinated scales ; 

 six branchial openings on each side ; teeth triangular above, ser- 

 rated below. 2i feet long. Mediterranean sea Shaw, v. 346. 



Gen. 8. SELACHE, Cuv. Squalus, Lin. 



Body elongated ; head small, with temporal orifices ; branchial 

 openings embracing nearly the circle of the neck ; teeth small, 

 conical, and without dentations ; first dorsal fin nearly be- 

 tween the pectorals and ventrals. 



S. maximus, Cuv. The Basking Shark, Penn. Body deep lead- 

 colour above ; belly white ; first dorsal fin very large ; teeth small, 

 conical, very numerous. About 30 feet long. Inhabits European 

 seas. Penn. Brit. Zool. iii. pi. 16. 



This species has nothing of the ferocity of the C. vufgaris, though it surpasses 

 it in size. It is common in some seasons on the western coasts of Britain. In 

 swimming the dorsal fin is often above the surface of the water. 



Gen. 9. CESTRACION, Cuv. Squalus, Schn. 



Jaws pointed, as long as the snout, armed with small pointed 

 teeth, and towards the angles with larger rhomboidal ones ; 

 a spine before each dorsal fin. 



C. Philippi, Cuv. Body brown above, white beneath ; mouth wide, 

 with ten or eleven rows of teeth ; a lengthened lobe on each side 

 of the head. 2 feet long. Inhabits seas of New Holland 

 Shaw, v. 341. 



2. With spiracles, but destitute of anal fins. 

 Gen. 10. SPINAX, Cuv. Squalus, Lin. 



Snout elongated, blunt at the end ; teeth small, edged, in many 

 rows ; a strong spine before each dorsal fin ; no anal fin. 



S. acanthias, Cuv. Picked Dog-Fish. Body brown above, whitish 

 below ; nose blunt. The young are spotted with white. 2 to 3 

 feet long. Common on the British Coasts. This species is ovo- 

 viviparous Shaw, v. 338. 



S.fuscus, Will. Body dusky above, abdomen nearly black. In- 

 habits European seas. Sharv, y. 339. 

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