118 INVERTEBRATA. 



Our species is more elongated than M. ccqualis, but less so 

 than M. Montmolini. The depth of the shell is a characteristic 

 feature, and in this as well as in the regular curvature of the 

 cardinal side, it shews affinity to M. lineata, Sow. (Fitton, pi. 

 xiv., fig. 2) ; but the absence of striation and the gibbous buccal 

 region readily distinguish it. 



Localities. Upware, Shanklin, I.W. 



MODIOLA, sp. nov. 



An ovate, lanceolate shell, convex, slightly arcuated, covered 

 with delicate, crimp-like striations, which are well developed upon 

 the buccal side, but appear to become fainter over the back. The 

 umbones are terminal, slender, oblique, and incurved. Cardino- 

 lateral angle gentle and rounded. The buccal area is but faintly 

 marked off, smooth, and slightly swollen. 



Measurements. Length, 2 inches; breadth, 1 inch; thickness 

 (across both valves), 1 inch. 



This shell is near to M. Cottce, Geinitz, but the author of that 

 species agrees with me that the two shells are distinct, the umbo 

 being much more obtuse in M. Cottce. The ornament striae have 

 the character of M. lineata, Sow., a shell totally different in 

 shape. 



We only know of a single specimen, and in this the shell itself 

 is wanting over most of the back ; therefore from being thus 

 imperfectly known I decline to give a name to the species. 



Locality. Upware. 



CARDIUM COTTALDINUM, D'Orbigny. 

 (Plate vi., fig. 4.) 



Cardium Cottaldinum, D'Orb., Pal. Fr. Terr. Cret., ill. p. 22, 



pi. CCXLIL, f. 1 4. 



Pictet and Campiche, Pal. Suisse Terr. 



Crti., St Croix, p. 146, pi. cxvm., 

 f. 1, 2. 



A larger shell than C. Ibbetsoni of Atherfield, and without the 

 posterior angles. Its greater cardino-pallial diameter distinguishes 



