LIMA. 45 



iuverted W. Tlie ribs are sliglitly i-aiscd and often somewhat wavy or irregular, 

 especially near the growth-ridg-es. The ribs and grooves are crossed by numerous 

 concentric linear ridges. The ribs are sometimes nodular, the nodules having a 

 concentric arrangement. At intervals, usually rather distant and fairly regular, 

 distinct growth-lamellsB are seen. 

 Measurements : 



(1) (2) (3) 



Length . 37 . 20 . 22 mm. 



Height . 51 . 37 . 32 „ 



(1) Chalk, Newtimber. 



(2) B. mucronata zone, Norwicli. 



(3) H. ■planus zone, Dover. 



Ajjiititles. — See L. {Ctomdcs) nqja (p. 42) and L. {Clcnoulcs) tecta (p. 43). 

 7y. divarlcafa also presents some resemblance to Lima Uohapfdi, Hennig,' found 

 in the Danian of Faxe. 



Bemarls. — This species has hitherto Ijeen known in England as Lima granosa, 

 Sow'erby. After making a careful comparison I feel no hesitation in regarding 

 it as identical with the widely-distributed L. dicaricatu, Dujardin. This form is 

 comparatively rare in England, and the part of the shell near the umbo is usually 

 wanting or imperfectly preserved. 



Type. — From the Chalk (? Lower Senouian) of Touraiue. Sowei-by does not 

 mention the locality or the horizon from which he obtained Lima granosa, and I have 

 not succeeded in finding the type. 



Distrihntion. — Zone of Terebratulina of Hitchin. Zone of Holastcr planus of 

 Winchester, Dover, and Cheveley, Blue Bell Hill, Burham (? II. planus zone).' 

 Chalk Rock of Cuckhamsle3^ Zone of Micraster cor-aitguinum of Micheldever. 

 Zone of Actinocamax quadratus of Salisbury. Zone of Belemnitella mucronata of 

 Salisbury and Norwich. 



Snh-ijrnns — LiMATULA, N. r. W'liod, 1839. 



(' Mag. Nat. Hist.,' new series, vol. iii, p. 2:33.) 



LiM.\ (LiMATUl..\) ToMr.ECKiAXA, d' Orbigiti/, 181-7. I'latc VII, figs. 7a,b, Sa — c,da,b. 



I8i7. Lima Tombeckiana, A. (VOrhignij. Pal. Frany. Terr. Crct., vol. iii, p. 534, 



pi. ccccxv, figs. 13 — 17. 

 1850. — — d'Orbigny. I'rodr. de Pal., vol. ii, p. 82. 



' ' Bill. K. Svon.ska Vet. Akad. Kandl .' vol. xxiv. No. 7 (1899), p. 10, pi. i. figs. 1. 2; Ravn, 

 • MoUusk. Daumarks KridUli I. Lamollibr. ' (1^02), p. lOO, pi. ii, fig. 15. 



