CUSPIDARIA. 259 
show the hinge, but it is provisionally referred to Liopistha on account of its 
external resemblance to some species of that genus.! It should be noted, how- 
ever, that it is also similar to some species which are believed to belong to the 
genus Pholadomya.* 
Distributionn—Red Limestone of Hunstanton. 
Family—CUSPIDARITDAN, Dall. 
Genus—Cuspiparia, G. D. Nardo, 1840. 
(‘ Ann. Sci. Lombardo-Veneto,’ vol. x, p. 49.) 
Cuspiparta Sapauptana (Pictet and Campiche), 1864. Plate XLIII, fig. 6a,b; 
Plate XLIV, fig. 3a, b. 
1864. Nemra Sapaupiana, F’. J. Pictet and G. Campiche. Foss. Terr. Crét. Ste. 
Croix (Matér. Pal. Suisse, ser. 4), 
p. 40, pl. ¢, figs. 5—7. 
Description.—Shell inflated, oval, oblique, slightly inequivalve, anterior part 
sloping rapidly to the margin, posterior part compressed and produced into a 
pointed beak. Anterior margin rounded ; ventral margin convex, curving upwards 
and passing gradually into the posterior margin. Umbones curved inwards and 
shghtly backwards. A narrow postero-dorsal area is bent at an angle with the 
sides of the shell, and is limited by a carina. 
Ornamentation consists of strong, concentric ribs, most of which are con- 
tinued on to the posterior beak, where they become rather smaller and closer 
together ; on the sides of the ribs and in the furrows are a few faint concentric 
lines. Length 14 mm.; height 11 mm. 
Affinities—This species is more inflated, the anterior part is more rounded, 
and the concentric ribs are stronger than in CU. pulchra (Sowerby). 
T'ype-—From the Gault of the Perte-du-Rhone. 
Distribution.—Lower Gault of Folkestone. 
! See, for example, Stoliczka, ‘Cret. Fauna 8. India,’ vol. iii (1870), pl. ii, figs. 10, 11; Moesch, 
‘Mon. Pholadomyen’ (1874), pl. xxxv, fig. 5; Geinitz, ‘Das Elbthalgeb. in Sachsen’ (‘ Paleonto- 
graphica,’ vol. xx, pt. 2, 1873), pl. xix, figs. 6,7; Weller, ‘Cret. Pal. New Jersey,’ vol. iv (1907), 
pl. lvin, figs. 3—9. 
* H.g. P. subdinensis (d’Orbigny), ‘Pal. France. Terr. Crét.,’ vol. ii (1844), p. 38, pl. ecl, figs. 
1—3, and ‘ Prodr. de Pal.,’ vol. ii (1850), p. 157. 
