C. Gabbii Rémond.
Shell cordate, ventricose, nearly equilateral; posterior side truncated, direct; anterior side slightly depressed; height and length nearly equal. Umbones very prominent; beaks incurved, approximate; lunule well marked, carinated; surface even, with fine imbricated lines of growth. Hinge (of the left valve) comparatively narrow; anterior fosset small, shallow, triangular; cartilage pit large, deep, long; lateral teeth heavy, thick, prominent.
Locality: vicinity of Kirker’s Pass, south of New York (of the Pacific) Plain from a late tertiary deposit.
The C. Gabbii will easily be distinguished from any other species yet discovered, from its heavy hinge and enormous lateral teeth. I take great pleasure in dedicating this beautiful fossil to Mr. W. M. Gabb, to whom I am indebted for repeated assistance in my palæontological studies.
This species occurs in shelly sands, together with Tapes regularis Gabb and Murex ponderosus Gabb, two other extinct species. The specimens are in the collection of Mr. W. M. Gabb and my own.
Ostrea L.
O. Bourgeoisii Rémond.
The description is from two lower valves, from the collections of Mr. l’Abbé Bourgeois (Pont-Levoy, France) and Mr. Pioche, (San Francisco.)
Shell sub-oval, higher than long, strongly contracted near the cardinal area, sub-rounded on the ventral margin; inferior valve comparatively thin, convex, irregular exteriorly, with remote, somewhat rugose, plaits of growth. Ligament fosset long, profound, minutely wrinkled and finely striated, oblique and turned downwards; muscular impression very large, oblique, and sub-central, somewhat prominent.
Locality: vicinity of Kirker’s Pass, from a late tertiary bed.