86 



pied by a wide, longitudinal, convex or grooved fold. T\vo 

 specimens from the Bradford Abbas district measured the first, 

 six lines in length, seven in breadth, and seven in depth ; the 

 second, five lines in length, five-and-half in breadth, and five in 

 depth. 



The British examples of this species, which are much smaller 

 than those found in Normandy, are a 'mall variety of Herault's 

 species. In 1852 I received some specnii r,s from near Sher- 

 borne, and, since then, many more have been met with by Mr. 

 Darell Stephens at Halfway House. 



No. 26. KHYNCHOKELLA CYNOCEPHALA, Richard. Plate IV., 

 fig. 16. 



TEEEBEATULA CYNOCEPHALA, Rich. Still. Soc. GeoL de France, 

 vol. xi., p. 263, pi. iii., fig. 5., 1840. 



Shell sub -pentagonal, nearly as wide as long ; the smaller or 

 dorsal valve is convex at the umbo, and continues to rise rapidly 

 to the extremity of the margin, with a slight inward curve, 

 forming a pinch^d-in, elevated and bidentated or tridentated 

 mesial fold ; three or four ribs only are present on the lateral 

 portions of each valve, which do not quite extend to the 

 front. In the ventral valve the sinus is rather deep, with one 

 or two ribs along its middle. Length six, width six, depth five 

 lines. 



This appears to be an uncommon species in the Inferior Oolite 

 of the Bradford Abbas district, for I found only one example of 

 it among upwards of a thousand specimens I had under ex- 

 amination. It was found by Mr. Darell Stephens at Crew- 

 kerne Station. Rh. Cynocepliala is a common fossil in the 

 passage bed or Inferior Oolite sands of some localities, and it 

 was met with by the Eev. F. Smithe, in an earthy, ferruginous 

 band between the two cephalopoda beds reposing on the Am. 

 jurensis zone at Huresfield Beacon in Gloucestershire; but this 

 latter bod is at least one hundred feet lower in position than the 

 Bradford Abbas Dossil bed 



