BRITISH FOSSILS. 



3 



ized, transversely jointed, and devoid of spines. The base only of the 

 dorsal fin is visible ; it is situated three inches from the occiput. 

 The scales are smaller and more uniform in size than those of the 

 other species ; they are rounded posteriorly, and are higher than long. 

 The surface ornament is very different ; instead of the distinct 

 tubercles so characteristic of that species, it is composed of minute 

 granules united into longitudinal rows, with only a few small 

 tubercles, interspersed occasionally, on some of the larger scales. 

 The characters above detailed fully warrant the specific distinction 

 of this from the species described by Dr. Mantell. 



Locality, — Found in the Gault strata at Speeton, in Yorkshire. 



Description of Plate. 



Fig. 1. Macropoma Eyertoni, size of nature. 

 Fig. 2. Maxillary bones of the opposite side. 

 Figs. 3. Scales, magnified. 



P. DE M. Grey Egerton. 



February 1857. 



Note. — Since the above description was written, I have received from Mr. Beckles a 

 specimen of a Macropoma found in the quarries of Purbeck stone near Swanage. The 

 specimen is not sufficiently perfect to determine the species ; it seems to be a shorter and 

 deeper fish than Macropoma Mantelli. It is interesting to know that the genus was in 

 existence previous to the deposition of the cretaceous system. 



P. DE M. Grey Egerton. 



April 20th, 1857. 



