112 INVERTEBKATA. 



Localities. Brickhill, Reigate, Tealby. 

 N. Europe. In Hils Conglomerat. 



S. Europe. St Croix (Neocomian), very general in the Neo- 

 comian of France. 



Lima Farringdonensis, Sharpe. 

 (Plate v., fig. 12, a, b.) 



Lima Farringdonensis, Sharpe, Quart. Jour. Geol. Soc, Vol. 



x. pi. 5, fig. 2. 



A species characterised by its intermediate ribs and by the 

 striae on the sides of the ribs, which gradually increase in strength 

 as the ribs dwindle towards the posterior side. 



Localities. Upware, Brickhill, Farringdon, Atherfield (Leck- 

 enby Collection). 



Lima longa, Roemer. 



L. elongata, Roemer, 1836 (non Sby.). 



L. longa, Roemer, 1841. Nordcl. Kreid., p. 57. 



L. undata, d'Orb., 1845. Pal. Fr., Terr. (kit. p. 528, pi. 414, 



f. 9—12. 

 L. longa, d'Orb., 1845. Pal. Fr., Terr. Cret. ill. p. 529, pi. 



414, f. 13—16. 

 L. longa, Pictet and Campiche, Pal. Suisse, St Croix, p. 128, 



pi. 161, f. 6, 7. 

 L. undata, Forbes. 



A very variable shell, especially in the nature of the ribs and 

 their interspaces, as may be well studied in the cabinet of Herr 

 von Strombeck in Brunswick. In some the ribs are broad and 

 flattened, in others narrow and rounded ; the interspaces are 

 usually distinctly pitted, but sometimes simp]e. Some of its varie- 

 ties are very near to L. abrupta. There is a very broad-ribbed 

 variety in the cabinet of Mr J. F. Walker, M.A., F.G.S., of York. 

 Some specimens from Upware have lost the outer layers of shell, 

 and present an almost smooth surface; the imbricating growth- 

 laminse being crossed by the faintest ' ghosts ' of the ribbing. 



