Emmons. American Geology, 1855, Among Cephalopoda Melia. Lophus large; ventral shell large; section elliptical, M. cancellatus (n.s.) Shells large; elongated; sides only slightly divergent; siphon large; surface marked by longi- tudinal and transverse striae, giving it a pitted appearance. Lorraine shales. Emmons American Geology 1855 p. 166 P rugosus (n.s.) Volutions about three, larger angulated and the larger part covered with striae, sharply arched upon the wide dorsal, ground band at the curve; both the striae and band are delicately serrated and replaced by a rather distant wavy lines; aperture undetermined. (Rare) Lorraine shales and sandstone. Foraine, Jefferson county, N.Y. Fig. 37 enlarged. Cyclolite (Dentomartlia) filibratus d'Orb. Trenton limestone, Frankfort shales.