158 SUPPLEMENT TO THE BRITISH 



rigeur du mot." W. quadrifida occurs, associated with W. cornuta, in the upper portion 

 of the Middle Lias or zones of Am. capricornus, A. margaritatus, and A. spinatus. It 

 has been found by the Rev. F. Smithe in the zone of Am. margaritatus (Middle Lias) at 

 Church Hill in Gloucestershire. 



136. Var. cornuta, Sow., 1824. Dav., Ool. Mon., p. 29, PI. Ill, figs. 11—18; Sup,, 



PI. XXI, fig. 19. 



I have not much to add to my statements with respect to this fossil at p. 29 of my 

 Monograph. Mr. Deslongchamps was mistaken when placing W. Iampas, Sow., as a 

 synonym of cornuta .- an error he now candidly admits, having had an opportunity of 

 examining specimens of W. Iampas. W. cornuta sometimes attains to large dimensions 

 in the Middle Lias at Chidecock near Charmouth. In some specimens of W. cornuta 

 the front is nearly straight without any marked indentation. 



137. Waldheimia Marle, A. d' Orb., sp. Sup., PI. XXI, figs. 16, 17, 18. 



Terebbatula Marim, A. d' Orbigny . Prodrome, No. 236 ; Etage Liasien, 1849. 

 Waldheimia — E. Desl. Brae. Jurassiques, p. 100, pi. xx, figs. I — 7, 1863. 

 — — R. Tate. Geol. Mag., vol. vi, p. 551, note, 1869. 



Alcide d'Orbigny did not describe or illustrate his species, but Mr. E. Deslong- 

 champs has done so at p. 100 of his ' Brachiopodes Jurrassiques, and as some specimens 

 obtained by Mr. J. F. Walker from the Middle Lias of Charmouth near Lyme Regis, as 

 well as of South Petherton near Ilminster, and another found by the Rev. F. Smithe in 

 the zone of Am. margaritatus (Middle Lias) at Churchdown, Gloucestershire, entirely 

 agree with the. description and figures of the French species, we feel satisfied as to their 

 identity. This identity was moreover confirmed by Mr. E. Deslongchamps during 

 his visit to Brighton in 1876. 



W. Maria is suboval or subglobose. Longer than wide, or about as long as wide, 

 smooth, much swollen out about the middle portion of the shell, truncated or very slightly 

 bilobed in front. "Valves almost equally convex, and often much thickened at the margin ; 

 beak incurved and truncated by a small circular foramen completed by a deltidium in 

 two pieces ; beak-ridges very sharply defined ; no fold or sinus in either valve. Propor- 

 tions variable ; an average-sized specimen measured — 

 Length 11, width 9, depth 9 lines. 



Obs. — Waldheimia Maria, according to Mr. E. Deslongchamps, varies much in shape. 



Some examples are elongated and moderately convex, while others are about as long 

 as wide and almost spherical. Mr. E. Deslongchamps considers this shell to be a 



