28 CRETACEOUS LAMELLIBRANCHIA. 



1850. Anomia pseudoeadiata, A. d'Orbigny. Prodr. de Pal., vol. ii, p. 84. 

 1854. — radiata, J. Morris. Cat. Brit. Foss., ed. 2, p. 161. 

 Is on ? 1846. — — A. E. Reuss. Die Verstein. der bohra. Kreideformat., 



pt. ii, p. 45. 

 1877. — — ? A. Fritsch. Stud, im Grebiete der bohm. 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 : 





(i) 



(2) 



(3) 



Length 



22 . 



. 20 . 



21 mm. 



Height . 



23 . 



. 22 . 



• 24 „ 



Affinities. — This species appears to be similar to A. sultruncata, d'Orbigny, 1 

 from the Planerkalk 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 : 



(i) (2) 



Length . . . 17 . . mm. 



Height 10 8-5 „ 



Affinities. — In A. costulata, Romer, 2 the umbo is not at the margin and is 

 somewhat spiral, and the ribs are more numerous ; the last is also the case in 



1 A. truncata, G-einitz (non Linnaeus), ' Char. d. Schicht. und Petref. siichs.-bohm. Kreidegeb.,' 

 pt. iii (1842), p. 87, pi. xix, figs. 4, 5; and "Das Elbtlalgeb. in Sacbsen " (' Palaeontographica,' 

 vol. xx), pt. 2 (1872), p. 30, pi. viii, figs. 22, 23. A. sultruncata, A. d'Orbigny, ' Prodr. de Pal.,' vol. ii 

 (1850), p. 171. 



2 'Die Verstein. Nord-deutsch. Ool-geb. Nachtrag ' (1839), p. 21, pi. xvir, fig. ,1, 



