CONCHIFERA. 
4t>3 
There are two sections .—* Shell transversely oblong. 
** Orbicular. 
Section IY r .— Crassipedes —The mouth united in front, 
or partly so ; foot thick, posterior; shell gaping when closed. 
TRIBE I.-MYARIA. 
Shells having a broad spoon-like tooth in each valve, or in 
one only; gaping at both extremities, or only at one. 
Genus 57.—AN A TINA— Lamarck. 
Generic Character. — Transverse, subequivalve, gaping at 
both valves, or in one only; no cardinal teeth ; one broad pri¬ 
mary tooth in both valves, projecting interiorly; a lateral plate 
running obliquely under the primary teeth. 
Anatina declivis. — The Sloping Anatina. 
Plate XCI. fig. 5. 
Oval, thin, brittle, a little gaping near the end, where it is 
truncated, slightly wrinkled concentrically ; yellow sand-colour. 
Two inches broad. Inhabits the British seas. 
Genus 58.—MYA.— Linnaeus. 
Generic Character. — Transverse, gaping at both ends, with 
one large dilated projecting and nearly vertical primary tooth in 
the left valve, and a hollow in the opposite valve ; ligament 
internal, inserted in the hollow of the primary tooth, and in 
the pit of the other valve. 
My a truncata. — The Truncated Mya. 
Plate XCI. fig. 6. 
Suboval, truncated, and gaping greatly at the smaller end; 
much rounded at the other ; covered with a yellowish-brown 
epidermis ; wrinkled transversely; inside white. Three inches 
broad. Inhabits the British coasts. 
Genus 59.—GALEOMMA. — Turt.on. 
Generic Character. —Equivalve, inequilateral, transverse, 
with a large oval gape at the front margin ; hinge without teeth ; 
ligament internal. 
