LIST OF FISH. 65 



9. Mouth at the fore end of the snout. The nostrils reach to the 

 mouth. The upper coiner fold of the mouth is wanting. Spout- 

 holes distinctly visible. The gill-openings small ; the last one 

 above the breast-fin. A spine before each back-fin. Tail short, 

 with a notch on the under edge of the upper lobe. — Heterodontin a. 



Heterodontus, Blainv. Bull. Soc. Phil. 121, 1816. 

 Cestraciontes, Mull, f Henle, Plag. 76. 



1. HETERODONTUS. 



Nostril-slit within the mouth, surrounded within and without by 

 a roll of skin ; the outer one turning inwards ; the inner one is sepa- 

 rated by a furrow from the upper-lip. Spout-holes small, outside 

 and somewhat behind the eyes. The eye under a ledge-like fold of 

 the skin of the head, which begins close behind the snout and runs 

 straight from before backwards. Only the under half of the corner 

 fold of the mouth is evident, and is moreover divided towards the 

 middle line from the skin of the under-jaw by a furrow. The upper 

 one is barely shown by a small notch. Pavement-like teeth, in the 

 middle small and pointed, from three to five denticles tiled from the 

 base towards the point, of which the middle one is the biggest, and 

 which are worn out in the old fish ; also even in those which are 

 not upright; in old individuals the radical denticles are indistinct, 

 or wanting. The lateral teeth are pavement-like, rhomboidal, 

 diminishing in bigness from the hindmost towards the first and 

 back : they have a roll running in the direction of their longest 

 diameter and a rough upper surface; altogether they remind one, 

 by their form, of a winding spiral snail-shell. Gill-openings de- 

 creasing in size from before backwards, the last two moderately 

 high above the breast-fin. Tail-fin short, with a distinct under 

 lobe. 



Heterodontus, Blainv. Bull. Soc. Phil. 121, 1816. 

 Cestracion (Les Cestraceons), Cuv. Be;/. An. 2 ed. ii. 291. Mull. 

 &C Henle, Mag. Nat. Hist. ii. 88, 1838. Plagiost. 76. 



1. Heterodontus Zebra. Chinese Cestracion. 



Cestracion Zebra, Gray, Zool. Misc. 5. Icon. Reeves, 174. 

 Hardw. Cart. 52. Rich. Rep. Brit. Assoc. 195, 1845. 



Har. — China. 



a. Stuffed. China. Presented by J. R. Reeves, Esq. 



b. Stuffed. China. 



g3 



