JURASSIC AND TRIASSIC BRACHIOPODA. 159 



variety of W. cornuta, and that passages in shape connecting it with W. cornuta and W. 

 quadrifida are readily found ; but the difference between W. Maria, W. cornuta, and 

 W. quadrifida appears to me greater than that which exists between the two last-named 

 forms. Some of the smaller specimens somewhat resemble W. anglica, Oppel, of the 

 Inferior Oolite, but differ from that species in the beak-ridges being more sharply 

 defined and the beak more incurved, and in the greater convexity of the valves. 



W. Maria is very abundant in the Middle Lias of Normandy, Yonne, in central 

 Prance, and at Aragon in Spain. 



138. Waldheimia indentata, Sow., sp., 1824. Dav., Ool. Mon., p. 46, PI. V, figs. 25, 



26 ; Sup., PL XXI, figs. 10—15. 



Since the publication of my description and figures of this species in 1851 I have 

 had, through the kindness of Mr. J. de C. Sowerby, the loan of Sowerby's original 

 examples, which are now in the British Museum. Of these, four agree with the 

 figured type, being indented in front, while the remaining three showed no indentation. 

 Mr. Beesley and Mr. E. A. Walford have found well-marked specimens with 

 and without indentation in the Am. spinatus Zone at Thenford, Northamptonshire, 

 about six miles to the east of Banbury), associated with Ter. Edwardsii, Bh. 

 tetrahedra, and Spiriferina oxygona. Mr. E. A. Walford has also found the 

 shell occurring in abundance, in the Marlstone Rock, along with T. Edwardsii, 

 at Appletree and Aston-le- Walls in Northamptonshire, about eight miles from 

 Banbury. I have also been able to examine three perfectly typical specimens from the 

 Am. spinatus Zone (Middle Lias) of the immediate neighbourhood of Banbury. One 

 specimen was a fac-simile of Sowerby's figured type, and had been in the possession of 

 Mr. Beesley's family for upwards of thirty years ; he had likewise some few years ago 

 picked up two blocks of the " dark greenish-grey limestone," containing several 

 examples of Sowerby's species, and he had been able to trace them to a small quarry 

 about two miles south of Banbury. Mr. Beesley informs me that the shell is now 

 hardly ever met with in the neighbourhood of Banbury, but that it was, no doubt, 

 abundant at the time Sowerby published his description of it, as the roads in the district 

 were then mostly mended with the stone he described as the " Oxfordshire ironstone," 

 which may have been obtained from quarries now long closed. 



I have received a very instructive series of typical examples, some showing no 

 indentation, from the Rev. F. Smithe, of Churchdown, who had obtained them from the 

 Am. margaritatus and M. spinatus Zones of Churchdown, in Gloucestershire. It is 



