608 ORDER CHONDROPTERYGII. 



The Indian Ocean possesses one remarkable for 

 the smallness of its first dorsal \ 



Another, the Sq. ecailleux, Brouss., (aS^. squamosus, 

 Lacep. I. x. 3. under the false name of aS^. tiche) is 

 remarkable for the small scales, in the form of leaves, 

 raised and crowded, which furnish its entire skin. Its 

 muzzle is long and depressed. 



We distinguish from scymnus, some species which 

 have the first dorsal over the ventrals, and the second 

 farther back. 



There is one completely furnished with small 

 spines, the Squale boucle, Lacep. I. iii. 2 ; Sq. spino- 

 sus, Bl. Schn. 



We may form a second genus of 



Zyg#:na, Cuv. Sphyrna, Rqfin. 



Which join to the characters of the sharks, a form of 

 head, of which the animal kingdom presents no other 

 example. Flatted horizontally, truncated in front, 

 its sides are prolonged transversely into branches, 

 which cause it to resemble the head of a hammer. 

 The eyes are at the extremity of the branches, and 

 the nostrils at their anterior edge. 



he gives it an anal. It is probably here that we must place the 

 Sq. brevipinnis, Lesueur, Ac. Nat, Sc. Phil. I. 122. of which this 

 author makes his genus Somniosus ; but he does not describe the 

 teeth. 



1 Leiche labor de, Quoy and Gaymard, Voy. de Frey. Zool. pi. xliv. 

 f. 2. 



