172 CRETACEOUS LAMELLTBRANCHIA. 



Measurements : 



(1) (2) (3) (1) 



Length 39-2 . 39 . 38 . 30 mm. 



Height 17 . 10 . 10-5 . 15-2 ., 



"D 



(1 — 4) Crackers, Atherfield. 



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

 l)y 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 

 T3oule has kindl}- 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 fi-om Atherfield with d'Orbignj^'s specimen 

 and considers that they do not differ specifically. Pictet and Campiche w'ere able 

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

 noted was the occurrence of fine radial ribs on the ]iosterior part of the shell in 

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

 which are not quite perfectly preserved. 



The figure of T. angnlata given by Deshayes appears to differ from 7'. ('iirtryinii 

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

 differences are probal:)l3' due to the imperfection of the specimen. Previous writers 

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



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

 sub-genus Phijllodn, Schumacher. 



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

 examples of this species in the occurrence of strong radial ril)s on the posterior 

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



Tij2)e. — From the Neocomian of Vendeuvre ; the original cannot be found. The 

 specimen figured by d'Orbigny came from Marolles. 



Distribution. — Lower Greensand (Crackers) of Atherfield. Atherfield Beds 

 of East Shalford. 



TEf.r.iXA sTR r ATI- 1.01 m-.s, Stolirzht, 1870. Plato XXVI, figs. 18, 19; Plate XXVII, 



fig. 1 . 



1824. Tellina stuiatula, J. de C. Sowerhy. Min. Condi., vol. v, p. 70, jil. cccclvi, 



fig. 1 (iKiu T. atriiitidd. Olivi, 

 Pxiltoii, Lainarck). 



1850. — —A. d'Orhlij,,;/. rrodr. di- Pal, vol. ii, p. l.W. 



1854. — — J. Morris. Cat. Brit. Foss., ed. 2, p. 226. 



