DESCRIPTION OF SPECIES. 



Class— LAMELLIBR ANCHIA, Blain ville. 



Family— NUCVLAmDM, Stoliczka.' 



Genus — Nuculana, H. F. Linl; 1807. 



(' Beschreib. der Naturalien-Sauiml. der Universitiit zu Kostock,' vol. iii, p. 155.) 



1. Lower Cretaceous Species. 

 Nuculana spathulata (Forbes), 1845. Plate I, figs. 1, 2 a — c, 3. 



1845. Nucitla spathulata, E. Forles. Quart. Journ. Geol. Soc, vol. i, p. 245, 



pi. iii, fig. 4. 

 1854. Leda spathulata, J. Morris. Cat. Brit. Foss., ed. 2, p. 205. 

 1866. — — F. J. Pictet and G. Campiche. Toss, du Terr. Cret. 



de Ste. Croix (Mater. Pal. Suisse, ser. 4), 

 pt. 3, p. 401. 

 1884. — — J. S. Gardner. Quart. Journ. Geol. Soc., vol. xl, p. 139 



{partim), pi. v, fig. 30 ? (non 31—34). 



Description. — Shell thin, compressed, elongate, very inequilateral; short and 



rounded anteriorly ; long and rapidly tapering posteriorly, with a faint carina 



extending from the umbo to the postero-ventral extremity, and cutting off a 



flattened area, which is ornamented with lines of growth only. Posterior 



extremity truncated and somewhat rounded. Antero-dorsal border slightly 



convex ; postero-dorsal border nearly straight, with a slight ventral slope. 



Umbones small. Surface (except the postero-dorsal part) ornamented with 



numerous fine concentric ribs. 



Measurements : 



(i) (2) 



Length . . . 14'5 . . 1G"0 mm. 



Height ... 6-5 . . 6-0 „ 



(1) Iu the Wiltshire Collection, Woodwardiau Museum, Pi. I, figs. 2, 3. 



(2) The type (a cast), PI. I, fig. 1. 



1 Por accounts of the classification of the Nuculanidse see G. Seguenza, " Nuculidi terziare 

 d' Italia," ' Atti della ~R. Accad. dei Lincei,' ser. 3a, vol. i (1877), p. 1163 ; and A. E. Verrill and 

 K. J. Bush, ' Amer. Journ. Sci.,' ser. 4, vol. iii (1897), p. 51. Owing to the imperfect preservation 

 of the interiors of many of the Cretaceous forms of this group, Nuculana is here used in the 

 extended sense. 



1 



