23 



64. An inferior pharyngcal bone of a large Cyprinoid fish, with four molarifonn 



Uvth having smooth crushing surfaces. 



Prnentedby Sir Anthony Carlisle, F.Jt.S 



65. An inferior pharyngcal bone and teeth of a Tench (Tinea vtdgarvt). 



66. The two inferior pharyngcal bones and teeth of a Roach (Lenri*cu* rutilus). 



Huntcria*. 



67. The two inferior pharyngeal bones and teeth of a Barbel (Barbun r(</ari). 



Here the teeth are elongated, compressed, with pointed incurved summits : in 

 the preceding specimens may be seen the gradual change from the molary to 

 the laniary type. Ilunterian. 



68. The superior pharyngcal plate and the inferior pharyngcal bones and teeth of a 



Chub (Leucuau cepkalus). In this fish the inferior pliaryngeals support both 

 obtuse and pointed teeth : they are small, and in greater numbers than the- 

 pharyngeal teeth of the preceding subgencra of Cyprinoid fishes. The ordi- 

 nary bones of the mouth in all this family are devoid of teeth. Iluntt-rian. 



69. The skull and anterior abdominal vertebrae of a small Cyprinodont fish. 



Ilunterian. 



Family Silurida. 



70. The skeleton of a small Siluroid fish . showing the strong symphysial union of 



the lower ends of the coracoid arch, and the anchylosis and lateral develop- 

 ment of the anterior abdominal vertebrae, both of which relate to the support 

 of the strong anterior pectoral and dorsal spines, which are pointed and ser- 

 rated, and constitute formidable weapons of offence. Purchaxed. 



7 1 . The dried head of a Siluroid fish, apparently of the genus Plotori*. The pro - 

 maxillaries support a few long, slender, straight, but not very sharp teeth 

 t lu- vomer supports a large triangular patch of small molar teeth with hemi- 

 spherical crowns : both kinds of teeth are present upon the prcmandibular 

 bones : the pharyngeal teeth are setiform. Htmtenan. 



