10 



tympanic*. The glossohyal supports pair of strong recurred pointed teeth nc*r iu extre- 

 mity, and one of similar pair remain* attached at iu middle part. The pharyngeal bone* 

 lupport several smaller teeth of the laniary kind. 



The cartilage representing the orbitosphenoid showi a very alight extent of reticulate os*i- 

 txm. 



The ossification of the prefrontal* U of the same incomplete character, and in two detached 



portion* on each side ; one surrounding the olfactory nerve or ' cnu rhinrnrephali,' the other 



supporting the back part of the nasal. The nasal bone is a single subcircular flat reticular 



^^ disc. The Tomer supports at its expanded anterior extremity a group of three strong laniary 



teeth. 



The premaxillaries are short and thick ; each supports six or seven short thick laniary 

 teeth. The long maxillary has a row of from sixteen to eighteen smaller teeth ; each palatine 

 has a row of fifteen or sixteen smaller teeth of the same shape. Each ramus of the lower 

 jaw consists of an articular and dentary portion, the Utter having from fourteen to sixteen 

 teeth. 



The branchiostegal rajs are ten in number, and progressively increase in length and 

 breadth as they approach the opercular bones, which they closely resemble in their scale-like 

 character. 



The formula of the fin-rays is: D. 14, P. 13, V. 9, A. 11 : that assigned 

 to the Salmo eriox in ' Van-ell's British Fishes' is : D. 11, P. 14, V. 9, 

 A. 11. C. 19. 



The fine specimen from which the skeleton above described was prepared, 

 was taken in the river Thame, at Drayton Manor, near Tamworth, November 

 1848. 



Pretexted by the JtyAl Hon. Sir Robert Peel, Bart., M.P., F.R.S. 



47. The dried head of a Trout (Salmo fario) \ apparently of the variety called 

 'Gillaroo': showing the position of the teeth upon the premandibular, 

 palatine, hyoid, vomerine, premaxillary and maxillary bones ; which- latter is a 

 very rare position for the teeth in the class of Fishes. Hunterian. 



Family Ettocida. 



48. The skeleton of a Pike (Etox Lvciiu). Number of abdominal vertebrae, 41 ; of 

 caudal vertebrae', 21 : total, 62. 



Small exogenous transverse processes are developed from the six last abdominal and eight 

 first caudal vertebrae, like those in the Angvillida : the terminal centrums of these vertebra 



o2 



