LIMA. 45 



inverted W. The ribs are slightly raised and often somewhat wavy or irregular, 

 especially near the growth-ridges. 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-lamellae are seen. 

 Measurements : 



(i) (2) (3) 



Length 37 . 20 . 22 mm. 



Height 51 . 37 ^ 32 



(1) Chalk, Newtimber. 



(2) B. mucronata zone, Norwich. 



(3) H. planus zone, Dover. 



Affinities. See L. (Ctenoides) rapa (p. 42) and L. (Ctenoides) tccta (p. 43). 

 L. divaricata also presents some resemblance to Lima Holzapfeli, Hennig, 1 found 

 in the Danian of Faxe. 



Remarks. This species has hitherto been known in England as Lima granosa, 

 Sowerby. After making a careful comparison I feel no hesitation in regarding 

 it as identical with the widely-distributed L. lUvaricata, 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 Senonian) of Touraine. Sowerby does not 

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

 not succeeded in finding the type. 



Distribution. Zone of Terebratulina of Hitchin. Zone of Holaster planus of 

 "Winchester, Dover, and Cheveley, Blue Bell Hill, Burham (? H. planus zone). 

 Chalk Rock of Cuckhamsley. Zone of Micraster cor-anguinum of Micheldever. 

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

 Salisbury and Norwich. 



Sub-genus LIMATULA, 8. V. Wood, 1839. 



('Mag. Nat. Hist.,' new series, vol. iii, p. 233.) 

 LIMA (LIMATULA) TOMBECKIANA, d'OrMgny, 1847. Plate VII, figs. 7 a, b, 8 a c, 9 a, b. 



1847. LIMA TOMBECKIANA, A. d'Orbigny. Pal. Fran9. Terr. Oct., vol. iii, p. 534, 



pi. ccccxv, figs. 13 17. 

 1850. d'Orbigny. Prodr. de Pal., vol. ii, p. 82. 



1 ' Bih. K. Svenska Vet. Akad. Handl.,' vol. xxiv, No. 7 (1899), p. 10, pi. i, figs. 1, 2 ; Eavn, 

 Mollusk. Danmarks Kridtafl I. Lamellibr. ' (1902), p. 100, pi. ii, fig. 15. 



