524 REV. G. P. WHIDBOBNE ON SOME POSSILS 



exactly like the smaller of the two shown in Quenstedt's figure on his 

 t. 93. It is perhaps slightly more transverse. It would almost 

 seem as if two distinct shells were united in the above synonymy, the 

 other one being an ovoid^shell much like /. transversa, Miinst. ; but 

 the material at hand does not appear sufficient for settling the point. 

 The English shell is beautifully marked with fine close-beaded rays. 



Leda lacetma, Sow. 



1824. Nucula caudata, Sow. Min. Conch, t. 476. 



1853. Leda lacryma, Morr. & Lye. Gt. Ool. Moll. pt. 2, t. 5. 

 fig. 15. 



1869. L. lacryma, Brauns, Mittl. Jura, p. 264. 



There is a poor specimen from the base of the Inferior Oolite at 

 Dundry, which appears to belong to this species. Dr. Brauns and 

 Morris and Lycett give long lists of synonyms. 



Caeditjm dundeiense, n. sp. Plate XVIII. fig. 8. 



1867. ? Cardium cognatum, Laube, Bivalven von Balin, t. 4. fig. 2. 



Shell almost exactly circular, globose, nearly smooth. Umbones 

 prominent, central, direct, gently curving over the hinge-line. Sides 

 nearly similar, the antero-superior portion being rather more de- 

 pressed, and the margin rather produced at the lower posterior 

 corner. Hinge with a distant lateral tooth on each side. Margins 

 meeting all round at a moderate and equal angle. Surface with 

 very fine concentric lines, crossed posteriorly by indistinct rounded 

 swellings, but with no signs of radiating lines. 



Locality. One specimen from Dundry in the British Museum. 



Dimensions. 23 lines long by 22 broad, and 16 deep for the closed 

 valves. 



This shell is very different from that figured by Phillips as C. 

 cognatum. It would agree in shape with Morris and Lycett's figure 

 •'.nd description of the same shell ; but it differs from that and all 

 the shells which I have seen referred to Phillips's species by the total 

 absence of radiating lines, which, though not appearing on Phillips's 

 figure, seem universally acknowledged as belonging to his shell. 

 Their absence in the specimen is the more evident, because the con- 

 centric marks are very distinct, and, just in the part where they 

 should be covered by rays, some small Polyzoa are attached, which 

 are wonderfully sharp and defined even under a lens. Mr. Tawney 

 has referred it to Phillips's species, and it may prove to be only a 

 variety of that shell. 



Leckenby, in giving a corrected figure in the Quart. Journ. Geol. 

 Soc. vol. xv. t. 3. fig. 8, which shows the rays, states that it was 

 impossible to recognize Phillips's species without a reference to the 

 original specimens. Laube's shell, though without striae, is wider, 

 while Isocardia clapensis, Terq. & Jour. Mem. Soc. Geol. Fr. ser. 2, 

 vol. ix. p. 11, fig. 13, though very near in general shape, is covered 

 by fine radiations, which do not appear in the figure. 



