BRITISH FOSSILS. 



3 



vertebrae, as seen in another specimen, were osseous, the neura- 

 pophyses short and slender, and the interneural spines continued 

 over the region anterior to the dorsal fin. In these respects the 

 genus greatly resembles Caturus, except that in the latter the 

 vertebral appendages are more robust. The scales are exceedingly 

 thin and overlaid with a very delicate coat of enamel finely sculp- 

 tured in concentric rings. The free margins were more or less 

 curvilinear, resembling in this respect the scales of Caturus and 

 Leptolepis, 



Locality. — All the specimens of this species hitherto found are 

 from the lias of Lyme Kegis. 



Explanation of Plate. 



Pachycormus latipcnnis, size of nature. 



P. DE M. Grey Egerton. 



February 1857. 



