46 BRITISH BELEMNITES. 



In the Lias of Lyme Regis occurs very rarely an allied form represented in fig. 13, 

 from specimens in the cabinet of Mr. Goodhall, inspected many years since. I only 

 know the exterior of these examples. A longitudinal section of another specimen from 



DIAGRAM 18. 



Lyme, preserved in the collection of the Bristol Institution, shows how short is the axis of 

 the guard (Diagram 18). This Belemnite is not mucronate. If additional specimens 

 come to my hands, I hope to determine its characters. 



Belemnites latisulcatus, n. s. PI. V, fig. 14. 



Reference. (I can find no satisfactory figure or description of this Belemnite.) 



Guard. Short conoidal, a little compressed, tapering rapidly in a curve on the ven- 

 tral side to an obtuse recurved summit, from which two broad, distinct, dorso-lateral 

 grooves proceed, widening over the alveolar region, and mai'gined on the dorsal side by a 

 distinct ridge. 



Sections. The ventral aspect somewhat wider than the dorsal. 



Proportions. The diameter (u d) at the apex of the phragmocone being 1 00, the ventral 

 radius is about 45^ the dorsal 55, the axis 180, the transverse diameter 94. 



Phragmocone. Not distinctly observed. 



Locality. Upper Lias of Whitby, the specimen figured {Phillips). In the Museum 

 of the Yorkshire Phil. Society is a specimen resembling this in general figure, but 

 more slender, and with only short dorso-lateral grooves. 



