]72 CRETACEOUS LAMELLIBRANCHIA. 



Measurements : 









(1) (2) (3) 



(4) 



Length 



39-2 39 . 38 



30 mm 



Height 



17 . 16 . 16-5 . 



(1 — 4) Crackers, Atherfield. 



15-2 „ 



Amnios —The English specimens differ from the figure of T. Carteroni given 

 bv d'Orbigny in the greater curvature of the carina, the narrower postero-dorsal 

 area and the greater upward bend of the anterior end of the shell. Professor 

 Boule has kindly examined the specimen figured by d'Orbigny, and states that 

 the carina is more curved and the postero-dorsal area narrower than represented 

 in the figure ; also the anterior part has been restored. Professor Boule has also 

 compared a photograph of a specimen from Atherfield with d'Orbigny's specimen 

 and considers that they do not differ specifically. Pictet and Campiche were able 

 to compare English with French specimens, and the principal difference which they 

 noted was the occurrence of fine radial ribs on the posterior part of the shell m 

 English specimens ; but I find that those ribs are indistinct or absent m specimens 

 wMch are not quite perfectly preserved. 



The fio-ure of T. angulata given by Deshayes appears to differ from 1. Oarterom 

 in its more elongate form and the greater length of the anterior region, but these 

 differences are probably due to the imperfection of the specimen. Previous writers 

 have not regarded it as distinct from d'Orbigny's T. Carteroni. 



Stoliczka regarded T. Carteroni as a typical Tellina, It resembles closely the 

 sub-genus Phylloda, Schumacher. 



One specimen from Atherfield (Plate XXVI, fig. 17) differs from the other 

 examples of this species in the occurrence of strong radial ribs on the posterior 

 part of the shell. It may be only a variety of T. Carieroni. 



Type.-¥rom the Neocomian of Vendeuvre ; the original cannot be found. Ine 

 specimen figured by d'Orbigny came from Marolles. 



Distribution.-Lowev Greensand (Crackers) of Atherfield. Atherfield Beds 



of East Shalford. 



Tellina stmatuloides, Stoliczka, 1870. Plate XXVI, figs. 18, 19; Plate XXVII, 



fig. 1. 



1824 Tellina striatula, /. de C. Sowerby. Min. Conch., vol. v, p. 79, pi. cccclvi, 



fig. 1 (non T. striatula, Olivi, 

 Bolt en, Lamarck). 



1850 A. d'Orbigny. Prodr. de Pal., vol. ii, p. 159. 



1854 J. Morris. Cat. Brit, Poss., ed. 2, p. 226. 



