BBITISH FOSSILS. 



3 



semblance may, perhaps, be traced between these scales and those 

 of Gyroleins; but, here again, we have probably a heterocerque fish, 

 it being restricted to beds older than the lias. As compared with 

 the Liassic Sauroid genera, already described, this fish differs from 

 them all, nor can it be ascribed to any of those genera named, but 

 not yet described, viz., Thrissonotus, Gentrolepis, Endactis, or 

 Cosmolepis. 



Locality. — The figure and description are taken from a specimen 

 in the collection of the Earl of Enniskillen, found in the lias at 

 Lyme Regis. 



Explanation of Plate. 



Fig. 1. Oxygiiathus ornatus, size of nature. 

 Fig. 2, 3, 4. Scales of ditto, magnified. 



P. DE H. Grey Egerton. 



May 1853. 



