LAMBLLIBRANOHIATA FROM THE MIDDLE MARL BEDS. 197 



MYTILID^. 



Genus MODIOLA Lam. 



Modiola ovata. 

 Plate XXVI, Figs. 13 and 14. 



Modiola ovata Gabb. Jour. Acad. ]^at. Sci., Phil., 4, new ser., p. 396, PI. LXYIII, Fig. 



31. SynopsifJ, p. 143. Meek, Oheck-list, p. 11. 

 Ferna ovata (Gabb) Meek. Geol. Surv. N. J., 1868, p. 726. 



Shell ovate in outline, or elongate ovate, of about a medium size, some- 

 what alate at the extremity of the short hinge-line. Valves very ventricose, 

 with nearly terminal beaks, which are small, incurved, and not conspicu- 

 ously raised above the cardinal line. Umbonal ridge prominep>S^ rounded, 

 and the surface of the shell in front of it slightly sinuate, giving a slight 

 sinuosity to the basal line; posterior extremity of the shell broadl}^ rounded, 

 and the anterior end narrow. Surface of the shell marked by very fine, 

 obscure lines of growth. 



Formation and locality. — In the Middle Marl Bed, at Timber Creek, 

 New Jersey. 



Genus MODIOLA Lam. 



Modiola (Lithodomus ?) inflata, n. sp. 

 Plate XXVI, Figs. 1 and 2. 



Shell small, cylindrically ovate, Avith large, tumid, anterior beaks, and 

 parallel dorsal and basal margins. Anterior and posterior ends nearly 

 equally rounded in a general view, as the beaks, from their downward 

 direction of curvature as seen in a lateral view, are blended with the 

 anterior margin so nearly as to give almost the same form as the posterior 

 end. In a dorsal view the form is strongly cuneately ovate from the rapid 

 attenuation of the shell posteriorly. Hinge-line rather short and the liga- 

 ment slender. 



This species bears considerable resemblance to Modiola JoJmsoni^ but 

 never attains so great a size, is more cylindrical, with a differently formed 

 beak, and a different surface structure, being smoother and destitute^ of the 



