FROM THE INFERIOR OOLITE. 509 



line |- the length of the shell, which is truncated in front of it, and 

 behind it spreads out flatly to the margins all round. Anterior 

 ear very small, not extending beyond the perpendicular plane 

 touching the lima-line. Margins forming a full and equally convex 

 curve till they meet the end of the lima-line, where the edge curves 

 suddenly in, and becomes slightly concave under the lima-line for 

 about half its length, where it meets the depressed edge of the 

 anterior ear. Growth-lines very numerous, indistinct, and lamellar. 

 Bays about 50, those on the sides being very low flattened plaits with 

 short steep sides, between broader flat grooves ; and those on the 

 central part merely broad, flat spaces, divided by narrow groove-lines. 

 These two varieties of rays, however, often alternate, the broader 

 flat ones seeming to split into two or three of the narrower steep 

 ones. 



Dimensions. 7 inches long, by 5| inches wide, and 4 inches deep 

 f 3r the two valves. 



There is one specimen from Eodborough in the Jerinyn-Street 

 Museum, another from the Lincolnshire Limestone of Stamford in 

 the Sharp Collection of the British Museum, and a small one from 

 Dinnington in the Bath Museum. 



Mr. Lycett's specimen at Jerrnyn Street is labelled " L. grandis;" 

 but this name cannot be used, as it has been already given by Burner 

 to another species of the same genus. 



In the Stamford specimen the rays are more numerous and 

 narrower, especially upon and near the posterior wing; and the 

 grooves have slanting sides, and form in section an almost regular 

 undulation with the rays. 



Lima incisa, Waagen, in Benecke's geogn.-pal. Beitr. vol. i. t. 30. 

 fig. 3, differs from this shell by being much more convex. Its 

 umbo is large, rounded, more prominent, and not anteriorly flattened, 

 and extends beyond the margin of the posterior wing, which is 

 small and posteriorly concave. Its margin is more swollen behind 

 and less so in front, the furrows are deeper and angular, and the 

 surface of the rays flat. 



Lima notata, Goldf. 



1835. Lima notata, Goldf. Petr. Germ. t. 102. fig. 1. 



1849. L. notata, D'Orb. Prodr. sect. 13, no. 394. 



1858. Plagiostoma notatum, Quenst. Jura, p. 627. 



1867. Lima complanata, Laube, Bivalven von Balin, t. 1. fig. 11. 



1871. L. notata, Terq. & Jour. Mem. Soc. Geol. Fr. ser. 2, vol. ix. 

 p. 117. 



There are six examples from the HumpJiriesiantcs-zone of Dundry 

 in the Bristol Museum, three of which seem typical specimens : and 

 I have several from Broad Windsor and the neighbourhood of Yeovil. 

 They generally differ from the foreign figures in having the posterior 

 ear strongly radiated. The species seems to vary considerably 

 in length, obliquity, and the number of its rays. The punctations 

 are usually clearly seen in the centre of the shell, but become obli- 

 terated near the margins. 



