60 



232. The left premaxillary bone of a smaller Sparoid fish with a similar type of 



dentition. Hunterian. 



233. The premaxillary and mandibular bones of a Sparoid fish, in which the anterior 



teeth are shaped like minute canines, the posterior teeth being large and 

 hemispheroidal, as in the foregoing specimens. There are two rows of these 

 molars on each premandibular bone, and three rows on each premaxillary, the 

 inner row being the largest. These numbers of the molar teeth indicate a 

 transitional form between the genera Chrysophrys and Pagrus. Hunterian. 



234. The premaxillary and premandibular bones of a Bream of the genus Pagrus, 



and of a species allied to, if not identical with, the Pagrus orfus, Cuv. 



Hunterian. 



235. The premaxillary and premandibular bones of the same species of Payrus. 



Hunterian. 



236. The maxillary and mandibular arches of the Rock Bream, from the Cape of 



Good Hope, called by the Dutch colonists ' Stein-brass ' (Dentex rupestris). 



A portion of the outer alveolar wall of the left premaxillary bone has been removed to 

 show the germs of the successional teeth : they make their appearance on the outside of the 

 teeth which they displace. 



Presented by Wm. Norris, Esq. 



237. The premandibular bones of a Sea Bream of the genus Dentex, allied to D. ar- 

 gyrozona, having four long and strong laniary teeth at the fore-part of the jaw. 

 One of these has been shed or broken away from the process of the jaw-bone 

 to which it was anchylosed : the alveolar cavity of its successor is exposed. 

 The fish was caught off Malemba during the Expedition to the Congo, under 

 the command of Captain Tuckey, R.N., in 1816. Presented by Dr. Leach. 



238. The left premaxillary bone of a species of Dentex : one of the large anterior 



tusks has been shed. Hunterian. 



239. The premaxillary and premandibular bones of a Sea Bream of the genus Den- 



tex, having in the upper jaw an outer row of moderate-sized conical pointed 

 teeth, with an inner narrow band of villiform teeth ; and in the lower jaw four 



