430 CRETACEOUS LAMBLLIBRANCHIA. 



Description. — Shell small, bean-shaped, convex, considerably inequilateral ; 

 posterior part higher than the anterior part. Anterior and posterior margins 

 rounded. Postero-dorsal margin slightly convex. Ventral margin with a slight 

 sinuosity. A rounded carina extends from the umbo towards the postero-ventral 

 extremity, and limits a compressed postero-dorsal area. Umbones broad, close 

 together. 



Measurements : 



Length . . . 8 - 5 mm. Height . . . 4 - 5 mm. 



Affinities. — This species is more elongate and more convex than T. ? subphaseo- 

 lina (see below). No specimens having the shell preserved have been found. 



Type. — A specimen which is believed to be the type is in the York Museum. 



Distribution. — Speeton Clay (zones of Belemnites jaculum and B. brunsvicensis) 

 of Speeton. 



Tellina ? subphaseolina (<V Orbhjn //), 1850. Plate LXII, figs. 11, 12. 



[Omitted from Vol. II, p. 177.] 



1845. Lavignon phaseolina, A. d'Orbigny. Pal. Franc. Terr. Cre't., vol. iii, p. 



407, pi. ccclxxvii, figs. 8—10. 

 1850. subphaseolina, d'Orbigny. Prodr. de Pal., vol. ii, p. 136. 



1865. Tellina phaseolina, F. J. Pictet and G. Campiche. Terr. Cret. Ste. 



Croix. (Mater. Pal. Suisse, ser. 

 4), p. 137, pi. cviii, fig. 10. 

 1870. Lavignon subphaseolina, F. Stoliczlca. Palaeont. Indica, Cret. Fauna 



S. India, vol. iii, p. 111. 

 Tellina phaseolina, Stoliczlca. Ibid., p 123 (? Peroniea). 



Description. — Shell oval or subquadrate, compressed, considerably inequilateral, 

 posterior part higher than the anterior part. Postero-dorsal margin nearly straight ; 

 posterior margin curved ; ventral margin with a shallow sinus due to a depression 

 on the sides of the shell ; anterior margin rounded. Umbones small, close together ; 

 between the umbones and the postero-ventral extremity is the greatest convexity 

 of the shell. 



Measurements : 



(i) 

 Length ..... 14 . 



Height 10 



Thickness ..... — 



(1—3) Gault, Folkestone. 

 Affinities. — The hinge is not shown in any of the English specimens. Pictet 

 and Campiche saw casts of the teeth, and they refer the species without doubt to 



(2) 



(3) 



14 



12 mm 



9-5 . 



8-5 „ 



5 



4- „ 



