BRITISH FOSSILS. 



3 



it traverses are large and fan-shaped. The surface of these scales is 

 covered with distinct striations radiating symmetrically from the 

 central line, and about 24 in number, 12 above the lateral line and 

 12 below it. In the scales above and below this principal series, 

 the strise are more divergent and oblique on the lower part of the 

 scales than on the upper. On the back, and occasionally in other 

 parts, the striae are intermixed with fine granulations. The pos- 

 terior edges of the scales are serrated. The scales in Pliolidophorus 

 ornatus have the striations less numerous, coarser, and less divergent ; 

 and the posterior edges are more deeply notched. The scales on 

 the back and belly in both species are considerably smaller than 

 those on the flanks. 



Locality. — This species was procured at the Swanage quarries by 

 Mr. Wilcox, and transferred with his collection to the Dorchester 

 Museum. 



Explanation of Plate. 



Fig. 1. Pholidophorus granulatus, size of nature. 

 Fig. 2. Scales magnified. 



Fig. 3. Scales of Pholidophorus ornatus, magnified. 



P. DE M. Grey Egerto:^^. 



July 1858. 



