﻿JURASSIC AND TRIASSIC BRACHIOPODA. 



79 



paper " On Some Species of Lingula" ( e Bull. Soc. Geol. de France,' 2nd series, vol. viii, 

 pi. i, fig. 2, 1850). 



I am quite ready to admit that I may perhaps have confounded with the 

 L. Beanii some specimens of Lingula from the Lias of Somersetshire, figured in my 

 Monograph ; but these last cannot be distinguished from L. Beanii on account of their 

 much smaller size, as stated by Mr. Deslongchamps. as they sometimes quite equal in 

 dimensions any examples of L. Beanii that have come under my observation. Nor are the 

 dimensions given by Mr. Terquem for his L. Beanii (height 20, breadth 13 millimetres = 

 10 lines by 6), very far short of those presented by the generality of specimens of L. Beanii, 

 Phillips. It is stated by both Voltz and Terquem that L. Voltzii occurs at Griesbach 

 (Lower Alsace), in a sandy limestone forming part of the brown limestone (calcaire 

 a pinnigene), and considered to constitute the highest bed of the Lias, lying 

 immediately under the Inferior Oolite. I have unfortunately not been able to obtain a 

 specimen of Terquem's species, but I received through the kindness of Mr. Bayan, of 

 the School of Mines of Paris, a French specimen identified and described as L. Beanii 

 by Terquem ; and which, like his figure, seems to differ a good deal from our Yorkshire 

 type of Phillips's species. In fact, the Yorkshire form does not appear to have been 

 understood in Prance, and Mr. Terquem is quite justified in the complaint he makes, 

 that Phillips did not describe his species. 



7. Lingula sacculus, Deioalque. Dav.,'Ool. Mon. (pars), PI. I, figs. 1, 1 a, b, c,d, and 



Sup., PI. IX, figs. 15—20, and PI. X, fig. 25. 



Lingula Beanii, Daw. Loud. Geol. Journ., vol. i, p. 18, figs. 26 — 30, 1847; and 



Ool. Mon., pi. i, figs. 1, 1 a, b, e, d (not L. Beanii, Phil.). 



— sacculus, Chapuis et Dewatque. Desc. des Foss. des Terrains secondaires 



de la province du Luxembourg, p. 233, 

 pi. xxxv, fig. 4, 1853. 



— Voltzii, R. Tate. Geol. Mag., vol. vi, p. 556, 1869 (not of Terquem?). 



Spec. Char. Shell elongated-oval, rounded in front, moderately convex, sides 

 merging posteriorly by a gentle curve into the acuminated beak; widest anteriorly 

 in some specimens, and especially so near the front. Valves marked with concentric 

 lines of growth. Muscular and other impressions strongly marked in the interior of 

 the valves. Proportions variable ; some large examples measured 

 Length 12, width 6 lines. 



Obs. This is probably the form described by Mr. Deslongchamps, and others, as 

 the L. Voltzii of Terquem, and believed by Mr. R. Tate to be the same as that described, 

 in 1853, by Messrs. Chapuis and Dewalque under the name of L.' sacculus. Its beak is 



