36 



itself. The line of demarcation between the dentified and ossified portions of the pulp is well 

 defined, so that when the pharyngeal bone and teeth are sawn through vertically, the fully 

 formed teeth appear as hollow cones set upon wedges of bone, as shown in the specimen. 



Mm. Brit. 



133. An inferior pharyngeal bone of a large species of Scarus, from the Bermudas. 



It shows well the effects of the powerful grinding action performed by the 

 posterior jaws of the Parrot-fishes. Presented by Prof. Owen, F.R.S. 



134. An inferior pharyngeal bone and teeth of a Scarus. Hunterian. 



135. The superior pharyngeal teeth of a Scarus. Hunterian. 







136. The teeth of the right superior pharyngeal bone of a Scarus. Hunterian. 



137. The superior and inferior pharyngeal bones and teeth of a Scarus. Mus. Brit. 



138. The right superior and the inferior pharyngeal bone and teeth of a Scarus. 



, Hunterian. 



139. The superior and inferior pharyngeal bones of a small Scarus. There are three 



series of denticles on each superior pharyngeal bone, decreasing in size from 

 within outwards. The gubernacular orifices leading to the dentiparous cavi- 

 ties at the back part of the bones are well seen in this specimen. Hunterian. 



140. The superior and inferior pharyngeal bones and teeth of a small species of 



Scarus. The superior teeth are in three series on each pharyngeal bone : the 

 inferior pharyngeal teeth form a disc broader than it is long. Hunterian. 



141. The superior and inferior pharyngeal bones and teeth of a small species of 



Scarus ; showing the articular surfaces and the processes for muscular attach- 

 ment. Hunterian. 



142. The superior and inferior pharyngeal bones of apparently the same species of 



Scarus. Hunterian. 



