LIMA. 43 



1872. Lima tecta, H. B. Gelnitz. Das Elbtlialgeb. iu Sachsen (PalsDontographica, 



vol. xx, pt. 1), p. 206, pi. xliii, fig. 3. 

 1877. — A. Fritsch. Stud, ini Gebiete der bohm. Kreideformat. : II, 



Weissenberg. u. Malnitz. Schicht., p. 130, fig. 113. 



1894. — — B. Lundgren. Mollusk-faunan i Mammillat-us och Mucronata 



zonerna (K. Svenska Vet.-Akad. Haudl., 

 vol. xxvi, No. 6), p. 43. 



1895. — — F. Vogel. Hollandisch. Kreide, p. 18. 



— — cf. tecta, E. Tiessen. Zeitsclir. d. deutsch. geol. Gesellsch., vol. xlvii, 



p. 474. 

 1898. — tecta, G. M litter. Mollusk. TJntersen. v. Braunschweig u. Ilsede, p. 27. 

 1902. — — M. v. Pdl/y. Mittheil. a. d. Jalirb. d. k. uugariscli. geol. 



Anstalt, vol. xiii, p. 275, pi. xx, fig. 5. 



Description. — Shell convex, much flattened, sub-ovate, slightly oblique, 

 considerably higher than long ; antero-dorsal part sloping steeply to the antero- 

 dorsal margin which is rather long and straightened. Umbones small, only slightly 

 incurved. Ears rather large, relatively high, the anterior larger than the posterior. 



Ornamentation consists of numerous small radial ribs, which are rounded, and 

 smooth or nearly smooth. At fairly regular intervals the course of the ribs is 

 interrupted by strong growth-lamellas, ventrally to which the direction of the ribs 

 is sometimes deflected. Growth-lamellae, and sometimes ribs, are present on the 

 ears. 



Measurements : 



Length 27 mm. 



Height 39 „ 



From the Ceuomaniau (Bed 11) of Dunscoinbe. 



Affinities. — This species is related to L. divaricata (see p. 14), but is 

 distinguished by the growth-lamellee, by the ribs not diverging from a median 

 line, and by the absence of the fine concentric ridges. Lima essertensis, de Loriol, 1 

 from the Urgonian, is a similar form but is distinguished by the growth-lamellse 

 being more closely placed. 



Remarks. — This species has a considerable stratigraphical range, extending 

 from Lower Cenomanian to Senonian. It has been recognised in France, Holland, 

 Scandinavia, Saxony, Bohemia, Hungary, etc. In England it has been found in 

 the Cenomanian of Devon only, having been discovered and identified by the late 

 Mr. C. J. A. Meyer, and first recorded by Mr. Jukes-Browne. The examples from 

 the Arrialoor Group, described by Stoliczka, seem quite indistinguishable from the 

 European forms. 



1 ' Toss. Corall. Valaug. et Urgonien de Mt. Saleve ' (1866), p. 83, pi. d, fig. 12 ; also iu A. Pavre, 

 ' Recherch. geol. Savoie,' vol. i (1867), p. 388, pi. c, fig. 23 ; Pictet and Cainpiche, ' Terr. Oct. Ste. 

 Croix' (1869), p. 139, pi. elxiii, fig. 7. 



