78 



330. The dried head of a File-fish (Salutes). 



The oblique shallow sockets, with their basal eminences for the attachment of the teeth by 

 reciprocal gomphosis, are shown in the premaxillary bones : one of the large incisive teeth is 

 in place in the left premandibular : the right has been displaced to show the apex of its suc- 

 cessor. 



Hunterian. 



331. A portion of the skull and dried integuments of a species of File-fish (Batistes). 



It shows the downward extension of the compressed presphenoid ; the bony projections 

 from the bottom of the shallow sockets of the incisors ; and the rough character of the ganoid 

 scales from which the fish has received its vernacular name. 



Hunterian. 



332. A similar but more mutilated specimen of the same species. Hunterian. 



333. The upper and lower jaws of a small species of File-fish (Balistes). 



The teeth are narrower in proportion to their length and more pointed than in the pre- 

 ceding specimens. Their apices have a reddish brown colour, like that of the enamel of the 

 incisors of some Rodentia. 



Hunterian. 



Family Ostrationidte. Trunk-fish. 



334. A dried specimen of a small pyramidal Trunk-fish (Ostracion turritus), want- 

 ing the tail, showing the partially ossified ganoid scales of the integuments. 



Mus. Brit. 



335. A dried specimen of the Ostracion nasus. Hunterian. 



336. A dried specimen of an Ostracion. Mus. Brit. 



337. A dried specimen of an Ostracion. Mus. Brit. 



338. A dried specimen of the horned Trunk-fish (Ostracion cornutus). The greater 



development of the tail relates probably to the more vigorous movements 

 required in the wielding of the peculiar weapons with which this species is 

 armed. Mus. Brit. 



