FISHES. 281 



suborbital bones forming a chain which extends from the anterior 

 frontal to the posterior one, and completing the frame of the orbit 

 which has been abandoned as it were by both the maxillary and jugal 

 bones, and assuming the appearance of the jugal, or representing (if 

 the expression be better liked) the portion of this bone, and that of the 

 maxillary, which, in the mammalia, were beneath the orbit ; and the 



Tbe twojugals or bone 

 of the pommette. 



Inferior Ring. 



The two internal pte- 

 rygoid apophyses. 



FIFTH VERTEBRAE. 



Superior Ring. 



The two parietals. 

 The two temporals. 



Body. 



The hyposphenal or 

 posterior body of the 

 sphenoid. 



Inferior Ring. 



The two great tube- 

 rosities of the circle of 

 the tympanum. 



The two Cotyleaux. 



The posterior 

 suborbitars. 



The pt^rygoi- 

 deans. 



Remarks. 



Here the author aban- 

 dons his doctrine of 

 the identity of the 

 number of pieces in 

 which one bone must 

 be represented but by 

 onebone. The posterior 

 suborbitars are some 

 times very numerous. 



The parietals. 

 The posterior 

 frontals. 



The posterior 

 sphenoid. 



The temporals 



The tympanal 

 and jugal, call- 

 ed by M. Geof- 

 frey, epicoty- 

 leal and hypo- 

 cotyleal. 



In his first essays, M 

 Geoffroy spoke of •< 

 symplectic which he 

 called uro-serrial, 

 other words, the infe- 

 rior, thin portion of 

 the frame of the tym 

 panum. 



Here, again, the au 

 thor abandons hisiden 

 tity of the number in 

 the representatives of 

 the bones, because, for 

 the two bones he has 

 made only one. I 

 ought to observe, also, 

 that the cotyleal, or, 

 in other words, the 

 case never, as it ap- 

 pears to me, can be 

 considered as a differ- 

 ent bone from the 

 tympanum, of which 

 it is only the continua- 

 tion. 



Here the two rings are 

 also disjointed, the one 

 from the other ; the 

 posterior sphenoid has 

 no connexion either 

 with the parietals and 

 the posterior frontals, 

 or with the temporals, 

 the chest, and the 

 jugal. 



