244 FISHES. 



the anal. The spiracles are wanting ; the nostrils are placed under 

 the middle of the depressed snout, and the last branchial apertures 

 extend over the pectorals. 



Sq. carcharias, L. ; Belon, 60.* (The White Shark.) This 

 species attains the length of twenty-five feet, and is recognized 

 by its teeth, which in the upper jaw nearly form isosceles tri- 

 angles with rectilinear and dentated sides. The lower ones con- 

 sist of narrow points placed on wider basis, terrific weapons, 

 which are the dread of mariners. It would appear that it inha- 

 bits every sea, but its name has frequently been applied to other 

 species with trenchant teeth. 



Sq. vulpes, L. ; Rondel., 387. (The Fox Shark.) Teeth form- 

 ing pointed isosceles triangles in each jaw, and particularly dis- 

 tinguished by the upper lobe of the tail, which is as long as the 

 entire body. The second dorsal and anal, on the contrary, are 

 extremely small, f 



Sq. glaums, L.; Bl.,86. (The Blue Shark.) Body slender, 

 of a slate-blue above ; pectorals very long and pointed ; upper 

 teeth forming curvilinear triangles bent outwards : the lower 

 ones straighter, all of them dentated. \ The 



Lamna, Cuv., § 



Only differs from a true Squalus in the pyramidal snout, under the 

 base of which the nostrils are placed, and in the locality of the bran- 

 chial openings which are before the pectorals. The species that inha- 

 bits the seas of Europe. 



Sq. cornubicus, Schn.; Lacep., I, ii, 3||. (The Porbeagle Shark), 

 has a projecting carina on each side of the tail, and the lobes of 

 its caudal are almost equal. Its size has often caused it to be 

 confounded with the White Shark. H 



* N.B. This figure of Belon is the only good one. Most of the others are incor- 

 rect. Bl., 1 19, is a very different species, which appears more allied to Scymnus ; — 

 Gunner, Mem. of Dronth., II, pi. x. and xi, the same described by Fabr., Groenl., 

 127, is another species also allied to Scymnus ; — Rondel., 390, copied Aldrov., 383, 

 is the comubicus, as well as Aldrov., 388, where the anal in torn away and the 

 jaws. Id., 3S2 ; — I will not name the monstrous figure of Gesner, 173, copied 

 Will., B. 7 ; — Larep., I, viii, 1, is the Sq. ustus. 



f It is on this last character that the genus Alopias, Raf., is founded. 



X Add; Sq. ustus. Dura. (Sq. carcharia minor, Forsk.,) Lac, I, viii, 1 ; Reqidn & 

 nayeuires noires. Q.uoy and Gaym., Zool. de Freycin. pi. 43. f. 1 ; — Sq. glauque, Lac, 

 I, ix, 1, which differs from that of Bl. ; — Sq. ciliaris, Schn., pi. 31, the cilia of 

 which only denotes its extreme juvenility. The Palasorrah and the Sorrakowah, Russ., 

 XIV. and XV, and a large number of new ones to be described in our Icthyology. 



§ Lamna, one of the Greek names of the lamia, which particular word I am pre- 

 vented from using, as Fabricius lias applied it to a genus of insects. 



|| The lamia, Rondelet, 399, the carcharias, Aldrov., 383 and 388, are nothing 

 more than the cornubicus, which attains a very large size, notwithstanding what Bl., 

 Schn., p. 132, says to the contrary. The pretended jaws of the carcharias, given by 

 Aldrov., 382, are also those of the cornubicus. It appears to be more common in 

 the Mediterranean than the true Squalus. 



^f Add Sq. monensis, Sh., which has a shorter snout and sharper teeth ; — Isurus 

 oxyrhynchus, Rafin, Caratt., XIII, 1, is very possibly a species of this genus, per- 

 haps the common one disfigured by the stuffer. 



