

79 



beak is short, incurved ; foramen small, circular, and separated 

 from the hinge-line by a deltidium in two lines length, eight 

 lines with seven ; depth, five. 



Mr. Darell Stephens has found two or three examples near 

 Sherborne ; it does not, however, appear to be a common 'species 

 in the district. 



No. 11. WALDHEIMIA ANGLICA, Oppel. Plate IV., fig. 1, 2, 3. 

 WALDHEIMIA ANCJLICA, Oppel. Die Jura, Formation, p. 425, 1856. 



Shell small, almost circular, smooth, without fold or sinus, 

 and much thickened at the margin. Some species are slightly 

 longer than wide, and somewhat laterally pinched in at the 

 posterior half of the shell. The beak is small, much incurved, 

 and truncated by a minute foramen; beak ridges sharply de- 

 fined ; loop not known, but probably that of the genus Wald- 

 heimia ; length of a large example eight lines, by seven in 

 breadth and five in depth. It is usually smaller. 



Mr. Darell Stephens obtained a number of specimens at 

 Crewkerne Station, and it has been found in considerable 

 quantity in the railway cutting at Bradford Abbas. 



No. 12. WALDHEIMIA WALTONI, Dm. Plate III., fig. 5. 



TEEEBEATULA WALTONI, Dav. British Foss. Brack., oolitic species, 

 p. 36, pi. v., fig. 1-3. 



Shell longitudinally oval or sub-pentagonal, rounded or 

 straight in front, very much thickened marginally. Smaller 

 valve slightly convex, and often very much flattened, without 

 fold or sinus ; large or dorsal valve more convex, and deeper 

 than the opposite one ; front line straight or slightly curved ; 

 beak rather large, incurved, and truncated by a small circular 

 foramen widely separated from the hinge-line by a deltidium in 

 one piece. Surface smooth ; length, one inch seven lines ; 

 width, one inch ; depth, nine lines. This species varies much in 

 shape, some examples being regularly oval, others pinched in 

 laterally and posteriorly, some straight in front, others slightly 

 indentated. In some specimens the smaller valve is almost flat. 



