CHONDROPTERYGII BRANCHIIS FIXIS. 287 



NOTIDANUS, CUV.(I) 



Only differs from Galeus in the absence of the first dorsal. 



Sq. griseus, L.; 'S'^', vacca, Schn.; Augustin Scilla, pi. xvii; 

 Le Griset.(2) Ash-coloured above, whitish beneath, and very 

 remarkable for its six wide branchial openings, and for its teeth 

 which are triangular above and serrated belowj the snout is de- 

 pressed and rounded like that of the Shark. 



Sq. ci?iereus, Gm. Seven very wide branchial openings; teeth 

 similar to the lower ones of the Griseus; snout pointed like that 

 of the cornubicus.(3) Both these species inhabit the Mediter- 

 ranean. (4) The 



Selache, Cuv.(5) 



In addition to the form of the Squali, and the spiracles of the Ga- 



lei, is furnished with branchial openings that are nearly large enough 



to encircle the neck, and with small conical and unemarginate teeth. 



The common species, Sq. maximiis, L.; Blainv., Ann. du 



Mus. torn. XVIII, pi. vi, f. 1 (The Basking Shark), has nothing 



of the ferocity of the Shark, although it surpasses it in size as 



well as all other Squali. Individuals have been captured that 



were more than thirty feet in length. It inhabits the Arctic 



Seas, but is sometimes driven on the coast of France by the 



strength of the north-east winds.(6) 



Cestracion, Cuv. 

 The spiracles, anal, and teeth en pave of the Musteli, with a spine 



The Emissole tachetee de blanc, ovlentillat — Rondel., 376, Bel., 71, cop. Aldrov., 

 393. 



(1) Nai-itTavoc (dry back), the Athenian name of some Squalus. 



(2) The teeth are well figured, but the fish itself very badly. It is the genus 

 Hexanchus, Rafin. 



(3) It is the genus Heptranchias, Rafin., who erroneously states that it has no 

 spiracles. 



(4) Messrs Quoy and Gaym. have discovered, in the Indian Ocean, a species of 

 this subgenus which is all spotted with black, and has seven spiracles. 



(5) Selache, lixd-x^, a Greek name common to all the cartilaginous fishes. 



(6) See the anatomy of this fish by M. de Blainville, loc. cit. N.B. The differ- 

 ences observed between the figures and descriptions of Gunner, Dronth., Ill, ii, 

 1, of Pennant, Brit. Zool., No. 41, of Home, Phil. Trans., 1809, and of Shaw, Gen. 

 Zool. may be owing to the difficulty that attends all attempts to observe such large 

 fishes, and may not be sufficient to establish species. Nor can I see in what par- 

 ticulars the Squalus elephas, Lesucur, Ac. Nat. So. Philad., differs from this maxi- 

 mtis- 



