NUCULANA. 5 



is in the Woodwardian Museum, and the original of fig. 33 in Mr. Meyer's 

 Collection; the originals of figs. 31 and 34 are missing. 



Specimens from the Atherfield Clay of Hythe and Atherfield, which Forbes 

 states were identified by d'Orbigny, are in the museum of the Geological Society 

 of London (Nos. 2107, 2115). 



Distribution. — Atherfield Clay of Atherfield, Sevenoaks, and Hythe ; Perna bed 

 of Bast Shalford; Lower Greensand near Devizes; Speeton Clay (C 3) of Speeton. 



Nuculana Seeleyi (Gardner), 1884. Plate I, figs. 15 a, b, 16 a, b, 17 a, b. 



1884. Leda Seeleyi, J. S. Gardner. Quart. Journ. Geol. Soc, vol. xl, p. 137, 



pi. v, figs. 17—19 (non 20). 



Description. — Shell oval, nearly equilateral, high and rounded at the 

 extremities ; moderately convex ; somewhat flattened. Ventral margin gently 

 curved. Umbones rather small, almost median. Surface smooth. 



Measurements : 



(i) (2) 



Length ... 7 10 mm. 



Height ... 5 . 7 „ 



Thickness. 3 5"5„ 



Affinities. — N. Seeleyi is distinguished from N. Vibrayeana (d'Orbigny) by the 



higher and more evenly rounded extremities, by the larger apical angle, by the 



gentler curve of the ventral margin, and by the central part of the valves being 



somewhat flatter. 



Types. — In the Woodwardian Museum (figs. 17,18 of Gardner) and the British 



Museum (figs. 19, 20). 



Distribution. — Speeton Beds (C 3 and C 9) of Speeton. 



2. Gault and Upper Greensand Species. 

 Nuculana solea (d'Orbigny), 1844. Plate I, figs. 18—24. 



1844. Ntjcula solea, A. d'Orbiyny. Pal. Franc. Terr. Cret., vol. iii, p. 170, 



pi. ecciv, figs. 4 — 6. 

 1850. Leda solea, A. cVOrbiyny. Prodr. de Pal., vol. ii, p. 136. 

 1866. — — F. J. Pictet and G. Campiche. Foss. Terr. Cret. de Ste. 



Croix (IV^ater. Pal. Suisse, ser. 4), 

 pt. 3, p. 401. 

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



pi. iii, fig. 30. 



