510 EEV. G. E. WHIDBOENE 0]NT SOME FOSSILS 



Lycett quoted it in the ' Annals ' from the Oolitic Marl and Great 

 Oolite of Minchinhampton, but does not describe it in his Monograph 

 published just afterwards. Hull, in the ' Geology of Cheltenham,' 

 p. 34, gives it from the Murchisoni-zone of Cleeve Cloud. On the 

 continent it extended as high as the "White Jura. 



Lima placida, n. sp. Plate XVII. figs. 7, 7 a. 



Shell smooth, extremely wide and flat, very oblique. Umbo very 

 small, acute, depressed, and flat. Anterior slope of lima-line con- 

 vex, steep, with a very small narrow surface before it. Posterior 

 ear well developed, high, and flattened. The inferior margins in a 

 regular curve, which becomes shallower towards the front, so that 

 the infero-anterior part is attenuated. Surface shining. Growth- 

 lines numerous, but very fine, and chiefly distinguishable by white 

 colour-bands. Rays numerous, but hardly visible, except in front, 

 where they are marked by indistinct linear grooves ; in other parts 

 only separated by lines of coarse, distant puncta. 



One specimen in the British Museum (Sharp Collection) from the 

 Northampton Sand. 



Dimensions. 15 lines long, 12 lines wide, and 2 lines deep. 



This species is very well characterized, and I have met with no 

 other species that approaches it. It is far the flattest Lima I have 

 seen. 



Lima platyboltts, n. sp. Plate XVII. figs. 8, 8 a, 8 b. 



Shell slightly convex, oblique, somewhat transverse, large. 

 Umbo sharp and small, truncated in front by the long, steep, and 

 elevated lima-line, which is three quarters the diameter of the shell 

 in length ; the shell being perpendicular in front of it, and behind 

 it slightly convex, and then dilated flatly to the margins. Anterior 

 ear very small, not extending beyond the perpendicular from the 

 lima-line. Byssal sinus very large and ovate. Posterior ear rather 

 large. Margins convex, the greatest curvature being on the posterior 

 side. Yalves meeting at a small angle. Surface covered by low 

 flattened radiations, separated by simple grooves half the width of 

 the plaits. 



Dimensions. Length 31 lines, width 24 lines, depth 5 lines. 



There are two specimens of this shell in the Jermyn-Street 

 Museum, one from Nails worth and one from Leckhampton. 



This shell is similar to Lima tumida, Rom., in its markings, but 

 is very much flatter and of a different shape. From Lima notata, 

 Goldfuss, it is distinguished by its more incurved and truncated 

 umbo, its greater convexity, its larger posterior and smaller anterior 

 wing, and its smooth unbarred grooves. 



Lima plebeia, Chap. & Dew. 



1853. Lima pleheia, Chap. & Dew. Terr. Sec. de Lux. t. 28. f. 1. 



There are fine specimens, identified as this shell by Mr. Tawney, 

 in the Bristol Museum. They are from the Iron-shot Oolite of 

 Dundry, from which I have myself obtained it. 



A fragment of another species from Dundry appears rather similar 



