JURASSIC AND TRIASSIC BRACHIOPODA. 181 



at his figures W. MandekloJii, p. 85, figs. 4 and 5, I think any one would feel puzzled 

 to define in what particular they differ. The var. Mandelslohi is, however, broader 

 and shorter, the margin of the shell is sharper than in the true typical W. carinata. In 

 this condition it occurs in the Lower Trigonia-grit (Inferior Oolite) at Cleeve, Crickley, 

 and Leckhampton Hills, near Cheltenham, also at Bradford Abbas, in Dorsetshire. 



It differs from Wald. Meriani by the sharpness of the edges of its valves, which come 

 together at a very acute angle. The shell appears also to be thinner. It likewise agrees 

 closely with specimens from the "Braun Jura" of Streichen and Gomelshausen, in Germany. 

 Professor Quenstedt was quite correct in considering it only a variety of W. carinata, 

 adding as a distinction the word alveata. 



A small variety, perhaps, of the same shell as above described (Dav., Sup. PI. 

 XXIII, figs. 21, 22,) occurs with it at Bradford Abbas. It may be its young state. 



167. Var. Blakei, Walker, MS. Dav., Sup. PI. XXIII, figs. 19, 20. 



In this variety the mesial depression in the dorsal valve is small, and the form of the 

 shell more circular, or ovate, but there appears to exist every passage between it and the 

 var. Mandelslohi, and between this last and true W. carinata. 



This variety is briefly described, but without name, by Messrs. W. A. Hudleston and 

 F. Walker in their printed communications to the Monthly Meetings of the Yorkshire 

 Philosophical Society, 1877. They mention that the smaller valve is carinated, some- 

 what resembling Wald. Walheri, Dav., from the Neocomian of Tealby. 



Specimens of this variety were found by Mr. Hudleston in blocks of Shelly Dogger, 

 belonging to the yellow sand (Inf. Ool.), which had fallen from the cliffs on the York- 

 shire Coast ; but others usually occur below the Terebratula-bed. It does not appear to 

 have much exceeded 9 lines in length, by 7 in breadth and 4 in depth. It is named 

 after the Rev. J. P. Blake, who has done good work among the Secondary rocks of 

 England. 



168. Waldheimia Meriani, Oppel. Dav., Ool. Mon., p. 33, PI. IV, fig. 8, and 



PI. X, fig. 7. 



Terebratula impressa (pars), Dav. Ool. Mon., p. 33, pi. iv, fig. 8, and pi. x, fig. 7 



(not other figures), 1851. 



— Meriani, Oppel. Die Jura-Formation, p. 424, 1857. 



— — E. Desl. Brach. Jur., p. 238, pi. lxiv, figs. 1—5, 1872. 

 "Waldheimia — Dav. Proceedings of the Dorset Nat. Hist, and Antiquarian 



Field Club, pi. iii, fig. 9, 1877. 



