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I to 3 inches in height, half as long. Sculpture coarse, consisting of ir- regular, radial rows of short, bar-like ribs, somewhat giving the appearance of shingles on a roof. Periostracum thin, dark- to light-brown. A common variation of this species (form tenera Sowerby) is startlingly different, in that the small radial ribs are much more numerous and much smaller (pi. 35h), Common under rocks in shallow water at low tide. Subgenus Mantellum Roding 1798 Lima heinphilli Hertlein and Strong Hemphill's Lima Plate 29c Monterey, California, to Mexico. I inch in length, white, obliquely elliptical in shape. With fine, irreg- ular, radial ribs which are crossed by very fine, rough threads. Anterior and posterior margins smooth. This fairly common species has been erroneously called dehiscejis Conrad and L. orientaUs Adams and Reeve. Genus Limatula Wood 1839 Liinatida subauriculata Montagu Small-eared Lima Greenland to Puerto Rico. Alaska to Mexico. % inch in height, ovate-oblong, greatly inflated (having the shape of the shell of a pistachio nut), and sculptured with numerous small, longitudi- nal riblets. On the inside of the valves there are 2 prominent, longitudinal riblets at the center of the shell. Periostracum over the white shell is yel- lowish brown. Moderately common in cooler waters from just offshore to 1000 fathoms. Genus Lime a Bronn 1831 Limea bronniana Dall Bronn's Dwarf Lima North Carolina to Florida and the West Indies. Very small, 5.0 mm. in height, ovate, superficially resembling a small Cardiuvi. With about 25 to 30 strong, smooth, rounded, radial ribs. Micro- scopic, concentric scratches between the ribs. Inner margin of valves serrated and reinforced by small, round teeth. Shell pure-white in color. Hinge-ears with an internal set of 3 or 4 small teeth. Superjamily ANOMIACEA Family ANOMIIDAE Genus Anomia Linne 1758 The valve without the hole has i large and 2 small muscle scars. The