PROM THE INFEBIOR OOLITE. 507 



which are finely striated, its umbo is more incurved, and its luiiule 

 longitudinally rayed. Prom L. ovalis, Desh., of Goldfuss, our shell 

 differs in the nature of its markings and its larger ears. 



A Yorkshire specimen of this shell bears the label " Avicula 

 multicostata, Bean." I have been unable to trace this name, which 

 may be a manuscript one ; but at all events, as Geinitz used the 

 same name in 1842 for a Cretaceous shell, he very probably has the 

 priority. 



Lima rxcrsA, Waagen. 



1873. Lima dustonensis, Lye. MSS., Sharp, Q, J. G. S. vol. xxix. 

 p. 296. 



1767. L. incisa, Waagen, Benecke's geogn.-pal. Beitr. p. 626. 



In the Sharp Collection at the British Museum are two specimens 

 of a large and rather convex Lima from Duston, which appears to 

 agree with Waagen's shell, one of them bearing " Lycett's " upon its 

 label. Being casts, it is not easy to form a definite opinion upon 

 them ; but there is in the same Museum a better-preserved speci- 

 men, stated to be from the " Great Oo." of Hardington, which seems 

 very like the German shell both in shape and markings, the prin- 

 cipal difference being that the broad flat rays and unpunctured 

 grooves are only visible on the lateral portions of the fossil. 



Lima inoceeamoides, n. sp., Eth. MSS. Plate XVII. fig. 5. 



Shell large, very flat, only slightly oblique. Umbo subcentral. 

 Posterior wing rather large. Lima-line short and low, but very 

 steep ; the surface in front of it being very concave. Margins 

 forming a curve of almost equal convexity, the greatest curvature 

 being in the middle of the inferior margin. The greatest depth 

 near the centre of the valve at about one third the diameter from 

 the umbo. Edges inclined to each other at a very small angle. 

 Structure thin. Surface smooth and polished, with a few small 

 indistinct growth-marks, and with five or six small and distant 

 furrows on each side near the wings. 



Dimensions. Length 3J inches, breadth 3^ inches, depth 1 j inch. 



There is a single specimen in the Jermyn-Street Museum, from 

 the Inferior Oolite south of Perrott. 



This is clearly a different species from the short-hinged Plagio- 

 stoma Iceve, scantily described by Buckman in Murchison's ' Geology 

 of Cheltenham,' p. 99. It approaches Lima Etheridgii, Wright, 

 which is sometimes centrally smooth, but in that species the urn- 

 bones are more median and the posterior wing larger. Lima inqui- 

 renda, Thurmann, Leth. Bruntr. t. 34. fig. 7, is a much more triangular 

 shell; and Lima plebeia, Chap. & Dew., wider and more oblique. 

 Lima Hoperi (Sow.) of the Chalk is its nearest analogue. 



Lima l^viuscula, Sow., var. 



1822. Plagiostoma Iceviuscula, Sow. Min. Conch, t. 382. 

 1835. Lima Iceviuscula, Goldf. Petr. Germ. t. 102. fig. 3. 



