﻿36 



SUPPLEMENT TO THE BRITISH 



irregularly round in shape, upper two thirds nearly flat, lower (front part) deeply 

 plicated, having a deep groove in the centre, bounded on each side by an elevation, 

 then a wide depression which slopes to meet the lateral elevations of the ventral valve, 

 thence rising to the level of the flat part of the valve, where the shell has its greatest 

 width. Loop short. Average dimensions: — length, l'l in.; breadth, 0' 9 in. ; thick- 

 ness, 0-8 in." 



This variety approaches very closely to T. Carteroniana, D'Orb., and indeed some 

 specimens seem to be nndistinguishable. It varies also very much, some specimens 

 being much flattened, while others are almost globular. The biplication is likewise much 

 more deeply indented in some examples than in others. This shell is exceedingly 

 abundant in the Lower Greensand or Upper Neocomian at Upware, Cambridgeshire^ 

 and where very finely preserved internal casts are likewise obtainable. 



37. Terebratula sella, var. Daw, Cret. Mon., PI. VI, figs. 45, 49 ; PI. VII, figs. 11— 



16 ; PI. IX, figs. 36, 37 ; and Sup., PI. V, figs. 11—16. 



Terebratula tornacensis, D'Archiac (in part). 



According to Meyer these shells (Sup., PI. V, figs. 11 to 14) would constitute an 

 extreme variety of T. sella as found in the upper beds of the Lower Greensand of 

 Shanklin, and Tealby, in Lincolnshire. It would likewise include a dwarf race of T. sella 

 occurring in the Sponge-gravel of Paringdon, and which we had formerly referred to the 

 T. tornacensis and var. Roemeri of D'Archiac (Sup., PI. V, fig. 15). It may also be ob- 

 served that some of the specimens attributed to T. sella, var. tornacensis, bear much re- 

 semblance to certain forms of T. acuta, Quenstedt, of which M. de Loriol has figured 

 a fine series of specimens in pi. xv of his excellent memoir on the fossils occurring in 

 the Middle Neocomian of the Mountain of Saleve, near Geneva. 



38. Terebratula phaseolina, Lamarck? Sup., PI. V, figs. 17, 17 a, b. 



Terebratula phaseolina, Lamarck? An. sans Vert., vol. vii, p. 251, No. 29, 1819. 



Mr. Meyer has found a small biplicated Terebratula in the Upper Greensand of 

 Niton, Isle of Wight, which he believes may be referable to the Lamarckian species. It 

 is ovate and biplicated near the front, nine lines in length by seven in width and five in 

 depth. It appears to agree with some specimens of that species from the zone of 

 Inoceramus labiatus of Lemaine, in Prance. 



I have seen one specimen only (from the collection of Mr. Meyer) ; more examples and 



