460 WOODWARD: FOSSIL FISHES OF THE UPPER LIAS OF WHITBY. 
preserved seems to bear much more resemblance to the Alum 
Shale of Whitby than to the tenacious clayey deposit in 
which the skulls ordinarily occur at Lyme Regis. The late 
Mr. William Davies' original label is thus probably correct. 
This specimen, shown of the natural size in the accom- 
panying photograph (fig. 1), lacks the posterior extension of the 
cranial roof, but is otherwise well displayed in right lateral 
Inspect. Its outer surface is remarkably smooth and thus 
Fig. 1. — Belonorhynchn.s hreriro-itri'i, A. S. Woodw.; skull and mandible, right 
lateral aspect, nat. size. ag., angular bone; d., dentary bone; na., 
narial opening; orb., orbit. [Brit. Mus., No. 39153.] 
apparently abraded ; but there still remain traces of the 
characteristic rugose and partly punctate ornamentation. The 
margin of the orbit (orb.) is distinct, while the oblique, ovate, 
narial opening (na.) is also recognisable. The hinder portion 
of the mandible is slightly deeper than the cranium above it ; 
and the sutural line delimiting the relatively large angular 
bone (ag.) is conspicuous. The large teeth are distinct, but 
mostly shown only in abraded section. 
The specimen just described, considered in connection with 
others both from the Lower Lias of Lyme Regis and the 
Upper Lias of Wiirtemberg, renders it possible to append the 
following specific diagnosis : — Head from three and a half to 
