50 



of the skull, where it manifests the loss of symmetry by the absence of the expanded plate 

 on the left side of the spine : this immediately articulates, in the entire skull, with the left 

 parietal, which is broader than the right. 



The presphenoid (9) is twisted up towards the right side. 



The frontal (11) has undergone still more distortion : its right posterior angle is truncated, 

 and the rest of that side scooped out, as it were, to form the large orbit of the right side, 

 which is bounded below by an unusually large and well-ossified suborbital bone : the left side 

 of the bone retains its normal form : a median crest which is continuous in the entire skull 

 with that of the supraoccipital divides the two sides. 



The left side of the expanded fore-part of the vomer (13) is chiefly developed : and 



The left prefrontal (14) is larger than the right. 



Purchased. 



184. The neural arches of the skull, and the eleven following trunk -vertebrae of 



the Turbot (Rhombus maximus}. The right suprascapula and scapula are 

 retained, with some of the epipleural spines diverging from the parapophyses, 

 one of the pleurapophyses of the left side, and the interneural spines attached 

 to the tenth and eleventh trunk-vertebrae. Hunterian. 



185. Nine anterior trunk-vertebrae of a Turbot (Rhombus maximus) \ showing the 



progressive elongation and enlargement of the parapophyses, as the vertebrae 

 recede from the head. Hunterian. 



186. The last two abdominal and the first three caudal vertebrae of a large Turbot 



(Rhombus maximus) : showing the formation of the haemal arch by the deflec- 

 tion and confluence of the parapophyses, which are produced downwards into 

 a long and strong spine ; this, in the first caudal, is broad and concave towards 

 the abdomen. Hunterian. 



187. The last four abdominal and first twelve sacral vertebrae of a Brill (Rhombus 



vulgaris], with the interneural and dermoneural spines attached to the last ab- 

 dominal vertebras, and the interhaemal and dermohaemal spines attached to the 

 anterior caudal vertebrae. The foremost interhasmal spine is of great length, 

 curved, and imbedded in the concavity of the first long haemal spine. 



Hunterian. 



188. The first and second caudal vertebrae, anchylosed together and so forming a 



' sacrum,' of a large Flat-fish (Pleuronedes, Linn.). The neural spines have 

 suffered fracture. Hunterian. 



