FROM THE INFERIOR OOLITE. 511 



to Lima cequilatera, Buv. Me use, 1. 18. fig. 14, but is insufficient for 

 identification. 



Lima poetica, n. sp. Plate XVII. fig. 9. 



Shell convex, transverse, slightly oblique, almost circular, with 

 prominent, distant, and rather pointed incurved umbones, which 

 project about the fifth of an inch beyond the hinge-line, and are 

 slightly posterior. Ribs about 20, sharply pointed and triangular 

 in section, separated by flat interspaces of a similar width, so that 

 a section would give a number of low triangles arranged their own 

 breadth apart. Slight furrows running down the centre of each 

 interspace, and faint traces of other radiations. The whole surface 

 crossed by numerous, coarse, and exceedingly regular, flounce-like 

 lines of growth, which become serrations on the top of the ribs. 

 Wings equal, unribbed, and continuous with the rest of the shell. 

 Hinge-line 8 lines in length. 



Locality. Dundry. One specimen in the Bristol Museum and 

 one in my own collection. 



Dimensions of one valve 15 lines in length, 14 lines in breadth, 

 and 5 lines deep. 



This shell appears to be very distinct. In shape and general form 

 it slightly resembles L. gibbosa, Sow., but is much less elongate, and 

 the markings are totally different. Lima acuticosta, Quenst. Jura, 

 t. 18. fig. 22, is much smaller and longer, and has more defined 

 ears ; while the small Avicula dathrata, Lye. Suppt. t. 40. fig. 7, 

 which much resembles it in ornamentation, is much wider near the 

 hinge, flatter, and less oblique. 



Lima rodbtjrgeksis, Lye. MSS. Plate XVII. fig. 10. 



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

 p. 291. 



Shell convex, not very oblique. Umbo very large, rounded, and 

 prominent. Lima-line slightly concave, -A- of the length of shell in 

 that direction. Greatest convexity of the valve at -J- of the diameter 

 behind the lima-line. Surface sloping straight up from the margins, 

 and curving over this point down to the lima-line, which is at a 

 much lower level, and then sweeping round with a great concavity, 

 so as to form a very large and deep lunule. Anterior wing small, 

 hidden within the lunule, margin starting from it concave, but 

 becoming exceedingly convex round base of lima-line, then pro- 

 ceeding at about the curvature of a circle to the posterior side, 

 where it again curves very rapidly before reaching the posterior 

 wing. Surface with whitish growth-lines, the most prominent 

 dividing the shell into three parts, and very numerous, obscure, flat 

 rays, separated by indistinct, smooth, linear furrows, chiefly seen at 

 the sides. 



Dimensions. Length 20 lines, width 15 lines, depth of each 

 valve 5 lines. 



One specimen in the Sharp Collection in the British Museum 

 from Northamptonshire. 



This species approaches Lima strigillata, Laube, but is a more 



