28 CRETACEOUS LAMELLIBRANCHIA. 
1850. Anomia PsEUDORADIATA, A. d’Orbigny. Prodr. de Pal., vol. 11, p. 84. 
1854. — RaDiaTa, J. Morris. Cat. Brit. Foss., ed. 2, p. 161. 
Non ? 1846. — — A. E. Reuss. Die Verstein. der bohm. Kreideformat., 
pt. ii, p. 45. 
= Sere — — ?4A. Fritsch. Stud. im Gebiete der béhm. Kriedef. ii. Die 
Weissenb. und Malnitz. Schichten, p. 142, fig. 142. 
Description.—Shell oval, a little irregular, higher than long. Left valve 
moderately convex, ornamented with numerous radial ribs, which on the adult 
shell are more distinct and more wavy than on the younger part of the shell, and 
of two sizes, the larger being distinctly granular. The radial ribs are some- 
times crossed by concentric growth-lines. Umbo near the margin. 
Measurements : 
(1) (2) (3) 
Length . ’ 20 » A). 5 PAL srowaat, 
Height . 23°. 1 2208 ea 
Affinities—This species appears to be similar to A. subtruncata, d’Orbigny,’ 
from the Plinerkalk of Strehlen, &c., but in that form the shell is much more 
regularly oval than in A. pseudoradiata. 
Types.—In the Museum of the Geological Society (No. 2029), from the Hythe 
Beds, near Sandgate. 
Distribution —Crackers, &c., of Atherfield; Ferruginous Sands (upper beds) of 
Shanklin; Hythe Beds, near Sandgate; Atherfield Beds of East Shalford, 
Sevenoaks, and Redhill. 
Anomia, sp. Plate V, figs. 4, 5 a, b. 
Description.—Shell more or less orbicular or oval, and rather inequilateral. 
Left valve moderately convex with a rather prominent umbo at the margin ; 
ornamented with radial ribs, which are slender, widely separated, only a little 
elevated, and rather irregular. 
Measurements : 
() (2) 
Length ; ; ; RZ; ; ; ) mm. 
Height i 5 ; 16 5 ; 8°5 56 
Affinities. —In A. costulata, Romer,’ the umbo is not at the margin and is 
somewhat spiral, and the ribs are more numerous; the last is also the case in | 
‘A. truncata, Geinitz (non Linneus), ‘Char. d. Schicht. und Petref. sichs.-bohm. Kreidegeb.,’ 
pt. iii (1842), p. 87, pl. xix, figs. 4, 5; and “Das Elbtlalgeb. in Sachsen” (‘ Paleontographica, 
vol. xx), pt. 2 (1872), p. 30, pl. viii, figs. 22,23. A. subtruncata, A. d’Orbigny, ‘ Prodr. de Pal.,’ vol. ii 
(1850), p. 171. 
2 «Die Verstein. Nord-deutsch. Ool-geb. Nachtrag’ (1839), p. 24, pl. xvir, fig. 5, 
