THE BRITISH FOSSIL BRACHIOPODA. 251) 



Shell almost circular, as broad as long. Dorsal valve gently convex and slightly 

 depressed along the middle. Ventral valve moderately convex ; beak incurved ; foramen 

 circular, surface smooth. 



Length 12, breadth 12, depth 5 lines. 



Obs. — Mr. S. S. Buckman states in his paper on the " Dorsetshire Brachiopoda," 

 above referred to, that he possesses internal casts of his T. Leesii, and that they show no 

 septum in the dorsal valve, and that it is a Terebrahda and not a Waldheimia. It is 

 distinguished from T. curvifrons by a shallower sinus, and comes exactly between the 

 last-named species and T. ampla ; it was figured by myself as Wald. carinata, var. 

 Mandelslohi. It occurs in the Inferior Oolite at Bradford-Abbas, and Marston Road, 

 Dorset ; and Stoford, Somerset. 



11. Terebratula. Cortonensis, S. S. Buckman. Dav., Appendix to Supplements, Vol. V, 



PI. XIX, figs. 3, 3 a, b. 



Terebratula Cortonensis, S. S. Buckman. Dorset Nat.-Hist. Club, vol. iv, p. 49, 



Shell longitudinally oval, longer than wide, broadest anteriorly. Dorsal valve slightly 

 convex, somewhat flattened, or gently raised near the front. Ventral valve deeper and 

 much more convex than the opposite one, with a very slight depression close to the 

 frontal margin ; sides rounded, beak incurved, projecting forward over and beyond the 

 umbo of the dorsal valve ; foramen of moderate size, nearly touching the dorsal umbo. 

 Surface of valves smooth. 



Length \\, breadth 1 inch 7 lines. 



Obs. — In his description Mr. S. S. Buckman observes that" this is a peculiar species, 

 occupying, as it were, a position intermediate between the variations of several other 

 species. It approaches Terebratula punctata, var. Haresjieldensis, but is distinguished 

 from it by greater proportionate breadth, much flatter dorsal valve, recurved side 

 margin, and beak projecting beyond the dorsal valve. It also approaches T. Buckmani 

 and the young of T. perovalis, but is much shorter, broader, and more circular in shape 

 than the first and lacks the biplications of the second." T. Cortonensis was obtained by 

 Mr. Buckman from the Inferior Oolite, in the zone of Am. Sowerbyi, near Corton Denham, 

 in Somerset, also at Bradford-Abbas, Dorset. In France it occurs in the Departments 

 of Sarthe, Meuse, and Moselle. Although somewhat different from T. punctata and 

 T. Haresjieldensis, this form is difficult to characterise, and I feel uncertain as to its 

 specific characters ; I give it on Mr. Buckman's authority. 



35 



