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ANOMIIDAE 371
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
Monterey, California, to Mexico.
Plate 29c
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 Limea 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