246 CRETACEOUS LAMELLIBRANCHIA. 
1855, PHovapomya CornvueLiana, F. J. Pictet and HE. Renevier. Foss. Terr. Aptien 
(Mateér. Pal. Suisse, ser. 1), p. 59, pl. vi, fig. 6. 
1865. — FJ, Pictet and G. Campiche. Foss. Terr. Crét. 
Ste. Croix (Matér. Pal. Suisse, ser. 4), p. 87. 
_- — — H. Coquand. Aptien de Espagne, p. 93. 
1870. — — FE, Stoliczka. Paleeont. Indica, Cret. Fauna S. 
India, vol. iii, p. 75. 
1875. — — G. Moesch. Mon. Pholadomyen, p. 96, pl. xxxiii, 
fig. 8 (? pl. xxxvi, fig. 4). 
Description.—Shell small, short, oval, inflated, compressed posteriorly, 
moderately mequilateral with a small gape at the posterior end. Margins rounded. 
Umbones prominent, incurved. 
Ornamentation consists of strong, rounded, radial ribs. The grooves between 
the ribs are shallow, and broader than the ribs. Concentric ribs cross the grooves 
and ribs, giving to the latter a granulate or tuberculate appearance. Near the 
posterior and anterior margins radial ribs are absent. 
Measurements : 
(1) (2) 
Length 20 : 15 mm. 
Height 16 10 
99 
(1, 2) Atherfield. 
Affinities. —This species resembles P. Sancti-Sabe (Romer)! from Texas and 
P. Vignesi, Lartet,? from Palestine, Syria, and Zululand, and JP. subdinensis 
(VOrbigny),® from the Cenomanian of Le Mans. 
From the Aptian of Wassy (Haute-Marne). 
Distribution.—Lower Greensand (Crackers) of Atherfield. Recorded by Topley 
from the Atherfield Beds of Peasemarsh and Shalford. 
Type. 
PHOLADOMYA GIGANTEA (Sowerby), 1836. Plate XL, fig. 14; Plate XLI, fig. 1. 
1708. C. N. Lang, Hist. lapidum figuratorum, p. 146, pl. xliv, fig. 1. 
1718. J. J. Scheuchzer, Helvetiz hist. nat., pt. 3, p. 307, fig. 113. 
1742. L. Bourquet, Traité des Petrific., pl. xxiv, fig. 145. 
1 « Kreidebild. v. Texas’ (1852), p. 48, pl. vi, fig. 7. P. Cornueliana has been compared with 
Corbula ewquivalvis, Goldfuss, by Pictet and Renevier, Pictet and Campiche, and Moesch, but Holzapfel 
has shown that Goldfuss’ species belongs to the genus Liopistha. Holzapfel, ‘ Die Mollusk. Aachen. 
Kreide’ (‘ Paleontographica,’ vol. xxxv, 1889), p. 150, pl. ix, figs. 4—6; Miller, ‘ Mollusk. d. Untersenon 
v. Braunschweig u. Isede’ (1898), p. 76, pl. x, fig. 9. 
2 «Explor. géol. de la Mer Morte’ (1877), p. 126, pl. xi, fig. 9; Blanckenhorn, ‘ Beitr. z. Geol. 
Syriens’ (1890), p. 94, pl. v, figs. 14—17; Kossmat, ‘Denkschr. d. k. Akad. Wiss., Wien,’ vol. Ixxi 
(1902), p. 55, pl. iv, fig. 9; Newton, ‘Trans. Roy. Soc. 8. Africa,’ vol. i (1909), p 79, pl. vi, figs. 3—6. 
3 «Pal. France. Terr. Crét.,’ vol. iii (1844), p. 38, pl. ccl, figs. 1—3. An internal cast resembling 
P. subdinensis has been found by Mr. J. Scanes in the Chloritic Marl of Maiden Bradley. 
