CLASS PISCES. 607 



The most common species in our seas, Sq. Zygoma, 

 L. ; Z. malleus, (the hammer-headed shark) Valen- 

 ciennes, Mem. Mus. IX. xi. 1 ; Parra, 32 ; Salv. 40 ; 

 Will. B. 1. is sometimes a dozen feet in length ! . 



Squatina 2 , Burner., 



Has air-holes, and wants the anal, like the third 

 subdivision of the squali, but it differs from all the 

 squali in its mouth being cleft at the end of the 

 muzzle, and not underneath, and its eyes being at 

 the dorsal face, and not in the sides. The head is 

 round, the body broad, and flatted horizontally ; the 

 pectorals are large and carried forward, but remaining 

 separate from the back by a cleft, in which the aper- 

 tures of the gills are pierced; the two dorsals are 

 behind the ventrals, and the caudal equally attached 

 above and below the spinal column. 



We have one in our seas, which grows to a pretty 

 large size. Squatina angelus ; Squalus squatina, L. 



1 Add the species represented by Bl. 117. to be recognised by its 

 nostrils being placed much nearer the middle (Z. Nob. Blochii), 

 Val. Mem. Mus. IX. xi. 2. Its second dorsal is also much nearer 

 the caudals. The species with a broad head, given under the name 

 of pantouflier, Lac. I. vii. 3. It is the pantouflier of Risso, Zyg. 

 tudes, Val. Mem. Mus. IX. xii. 1. Koma sorra, Russel, xii. 2. 

 The true 'pantouflier ( Sq. tiburo, L. and Val. loc. cit. xii. 2.) Marcg. 

 181. to be recognised by its head, in the form of a heart. N.B. 

 The tail of Bloch's figure is twisted, which has occasioned the error 

 in the edition of Schn. p. 131. Caudce inferiore lobo longiore. 



2 'Pli't) in Greek, Squatina and Squatus in Latin. Ancient 

 names of this fish preserved to the present day in Italy and Greece. 



