81 



No. 15. WALDHEIMIA MARIANI, Oppel. Plate III., fig. 9. 



TEREBRATULA MARIANI, Oppel. Die Jura, Formation, p. 424, 

 1857. 



Shell sub-oval, as wide or a little longer than wide, broadest 

 posteriorly, tapering anteriorly, and slightly indented in front; 

 ventral valve deep and keeled ; beak much incurved and trun- 

 cated by a small circular foramen lying close to the.umbo of the 

 smaller valve ; beak ridges sharply defined ; dorsal valve slightly 

 concave, especially posteriorly, and divided into two portions by 

 a deepish median groove, to which the lateral portions of the 

 valve converge on either side ; length twelve, width ten, depth 

 eight lines. W. Mariani was found by Professor Buckman at 

 Bradford Abbas. 



No. 16. WALDHEIMIA ORNITHOCEPHALA, Sow. Plate III., fig. 

 12-13. 



TEREBRATULA ORNITHOCEPHALA, Sow. Mm. Con., tab. 101, fig 1. 



Shell ovate-rhomboidal, longer than wide, broadly rounded 

 posteriorly, laterally, and anteriorly, more or less pinched in 

 and nearly straight in front; valves moderately convex, with- 

 out fold or sinus, flattened along the middle and somewhat 

 abruptly sloping away laterally, so as to leave two more or less 

 defined diverging lines on the surface of each valve. The beak 

 is much incurved, the small circular foramen slightly overlying 

 the umbo of the opposite valve, but usually leaving between it 

 and the hinge-line a small space for the deltidium. Length, 

 sixteen lines ; width, twelve lines. 



I am assured by Mr. Darell Stephens that this species has 

 been found by himself in the Inferior Oolite at Milborne Wick, 

 the station next before Sherborne, and there can be no doubt 

 that the specimens he forwarded to me are referable to that 

 species. W. ornitliocephala is generally met with in the Fuller's 

 Earth near Bath and in other places, and I had not noticed it 

 previously so far down in the series, 

 K 



