NUCULANA. 3 
Affinities—The shell in N. subrecurva is more inequilateral, and more pointed 
at the extremities, than in N. phaseolina (d’Orbigny), and the latter is ornamented 
with concentric ribs. 
Remarks.—Phillips gave no description of this species, and his figure is an 
outline only, but is sufficiently characteristic to enable us to identify the form. 
Types.—I have not seen the type of N. subrecurva. An internal cast from 
Speeton (8 mm. in length) in the York Museum is labelled as such, but it does not 
belong to this species. The specimens figured by Gardner are in the Leckenby 
Collection, Woodwardian Museum. 
Distribution.—Speeton Clay (D 3 and D 4) of Speeton. 
NUCULANA SPEETONENSIS, sp. nov. Plate I, figs. 6a, b, 7a, b. 
P NUCULA XQUILATERALIS, Bean MS., ron F. A. Rémer. Die Verstein. d. 
Norddeutsch. Oolithgeb. (1836), p. 101, pl. vi, fig. 13. 
Description.—Valves almost equilateral, about twice as long as high, convex, 
anterior and posterior extremities almost equally rounded. Ventral margin 
slightly curved, almost parallel to the dorsal. Umbones nearly central, close 
together, of moderate size, with a depression in front and behind. Surface 
ornamented with numerous fine concentric striz. 
Measurements : 
q) (2) 
Length 5 : : 17 : 2 18 mm. 
Height : ; : 10 : ‘ 9:5 w as 
Ajfinities.—This species resembles Leda Neckeriana, Pictet and Roux, from 
the Gault; but in that form the umbones are larger and more widely separated, 
and the shell appears to be less equilateral. 
N. phaseolina, Michelin, is smaller than N. speetonensis; it is also more 
angular posteriorly, not quite so equilateral, and apparently more coarsely 
ornamented. 
Types—In the British Museum, and the Museum of Practical Geolo 
Jermyn Street. 
Distribution.—Speeton Clay of Speeton. 
gy, 
Nocurana [? Youpra} scapua (d’Orbigny), 1844. Plate I, figs. 8a—c, 9—14. 
1844. Nucvra scapua, A. d’Orbigny. Pal. Franc. Terr. Crét., vol. iii, p. 167, 
pl. ecei, figs. 1—3. 
1845. — ~- E. Forbes. Quart. Journ. Geol. Soc., vol. i, p. 245. 
1854. Lepa scapna, J. Morris. Cat. Brit. Foss., ed. 2, p. 205. 
1866. — — F. J. Pictet and G. Campiche. Foss. du Terr. Crét. de Ste. 
Croix (Matér. Pal. Suisse, ser. 4), pt. 3, 
pp. 395, 400, pl. exxix, fig. 2. 
