402 



Prof. Ralph Tate (Yorkshire Lias, p. 418) remarks of 

 Waldheimia sarthacenthis of cI'Orbignt "The shell is distin- 

 guished by its subpentagonal form and small umbo and is closely ' 

 allied to W. indentata (Sowerby), but does not present an 

 indented front, from which character the latter species owes its 

 name." Having had the advantage of examining a French 

 type of W. sarthacensis, we have hitherto found no form that 

 corresponds with it in our Lias : and with regard to the 

 indented character of W. indentata, this we can affirm to be not 

 a constant character. W. indentata is often mistaken when not 

 adult, from in acquaintance with a fact established by Mr. 

 Davidson after a careful examination of a large number of 

 perfect specimens of the shell in every shade of growth from 

 our Spinatus beds, that the indentation is not always present, 

 or is at least an inconstant character. 



Another point worth stating may be mentioned of the adult 

 state of Waldheimia rimosa, deduced from Mr. Davidson's ^^^^^•^'^^•^** 

 examination of a large suite of specimens from Churchdown, 

 comprising shells of difiPerent ages, that the bifurcation of the 

 ribbing in this species does not begin in the youngest state, 

 but is only developed as the shell advances towards full grovdih. 



Terebratula punctata {Sow). To this name must be assigned 

 the so-called species Terehratula (Epithyris) subovoides of Roemee. 

 This was for some time a vexed question with U. Schlonbach, 

 Oppel, and other Continental authors. The name, T. subovoides . 

 was espoused by Oppel, Deslongchamps, and others. But Mr. 

 Davidson, with indefatigable patience and research has at length 

 settled the matter, and disposed of Roemeb's name. It is singular 

 that a subdivision of the Middle Lias in Germany had been 

 termed by Roemer, the T, subovoides Beds. These must now ! 



be known as the T. punctata Beds. A complete and searching 

 revision of the group of T. punctata and its allies, accomplished 

 with unsparing pains, is clearly set forth in the first part of the 

 Supplement to the Brachiopoda in the Palseontog. Soc. volume 

 for 1877. 



