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SUPPLEMENT TO THE BRITISH 



at Bayeux, Les Moutiers, and other places in Normandy. It apparently occupies 

 the same stratigraphical position at Balingen in Wiirtemberg. In England, according to 

 Mr. Walker, it would be found in the Inferior Oolite at Cleeve and Crichley Hills, 

 Gloucestershire. 



90. Terebratula Buckmani, Dav. Dav., Ool. Mon., p. 44, PI. VII, figs. 15, 16. 

 Nothing new. 



91. Terebratula trilineata, Young and Bird. Dav., Ool. Mon., p. 48, PI. VIII, 



figs. 6, 7 ; and Sup., PI. XVI, 

 figs. 1, 2 (not T. ovoides, Sow.). 



Terebratula trilineata, Young and Bird. Geol. of Yorkshire, pi. viii, fig. 17, 



1828. 



Spec. Char. — Shell longitudinally and broadly oval, sides rounded, nearly straight in 

 front, broadest about the middle. Dorsal valve either uniformly convex with a straight 

 front line, or the front line raised into a gentle wave, but without biplication. 

 Ventral valve slightly deeper than the opposite one, uniformly convex ; beak 

 moderately produced, and truncated by a rather large circular foramen, slightly separated 

 from the hinge-line by a small deltidium. Surface smooth, marked by concentric lines 

 of growth. Proportions variable. 



Length 2 inches ; breadth 1 inch 8 lines ; depth 1 inch 6 lines. 



Obs. — At page 48 of my Oolite Monograph I confounded this species with T. ovoides, 

 Sow. At that period very little was known precisely with respect to the last-named shell ; 

 since then, at page 9 of the Supplement to the Species from the Drift, I explained this 

 mistake, and, as far as I could, set matters right. 



Position and Locality. — T. trilineata is very abundant in the Inferior Oolite at the Peak 

 on the Yorkshire coast, also at Blue Wyke, Glazedale, at eight miles inland from Whitby, 

 at Rosedale, Glosmont, &c. It occurs very often in the condition of internal casts, 

 on which the muscular scars are sharply defined, as may be seen in some of our figures. 

 Mr. Hudleston mentions having found the fossil in the shelly bed of the Dogger at 

 Craig Hall (d. 3, fig. 4 of Phillips' Yorkshire Oolite, Part 1). T. trilineata'^, exceedingly 

 variable in shape ; some examples are broadly oval, others elongated and bearing 

 resemblance to T. punctata, or its var. sub-punctata ; still, taking the general character 

 of the species, it is materially different or distinct from those last named. 



