44 
prominent ; teeth rounded and projecting inwards. 4. 
-s Dublin Bay. 
Tripe.—MACTRACEA. 
Equivalve, frequently gaping at the lateral extremities, 
with the ligament internal or partly external . 
Grenus.—LUTRARIA. 
Inequilateral, transversely oblong, or rounded, gaping 
at the extremities ; hinge with either a somewhat 
complicated tooth, or two, one of which is simple 
with an adjoining deltoid hollow which is oblique 
and prominent within ; no lateral teeth ; ligament 
internal, attached in a pit. 
L. Osionea. Turt. B. p. 64. t. 5. f.6.-—Mya. O. 
Gm. 3221:-—Ch. f.12.—Macrra Hans. Don. t. 140. 
—Mont. p. 101.—Pen. 4. p. 196.—Lin. T. 8. p. 74. 
—Dor. Cat. p. 33. t. 2. f. 4.—D. p. 146-—Turt. 
D. p. 85. f. 41.—Da. Cos: t. 17. f. 4.—L. Soren- 
o1DES. Lam. 1.—Bl. t. 77. f. 3.—Sow. G. fi 1— 
L. Hrans. F. p. 464.—Oblong, posteriorly short and 
rounded, anteriorly produced and obtuse, margins 
subparallel, the dorsal slightly incurved ; yellowish or 
reddish white under a thick dusky epidermis, irregularly 
wrinkled transversely: hinge with a grooved flattish 
tooth locking between two. 2%...54. W. Counties. 
