124 MOLLUSCA FROM THE CRAG. 
In dental characters and position of the ligament it corresponds with some of the 
other species included in this genus, and appears to be more closely allied to it, than 
to Galeomma in which Philippi has placed his shell, which is considered here with 
doubt as an identity. 
One specimen of mine has the two valves united, but does not show an opening 
at the ventral margin, a character essential to that genus; there is a twist in the 
shell, and the single valve, when laid with its margin downwards, will not touch on all 
sides, and this bend in the opposite valve is in the contrary direction, so as to bring 
the margins of the two pieces together at all parts when the valves are closed ; never- 
theless there is something about it peculiar to itself as possibly not to belong to either 
this or to Galeomma. 
7. Kewuia pumita, 8. Wood. Tab. XII, fig. 15, a, 6. 
Monracura pumtta. S. Wood. Catalogue, 1840. 
Kewira pumita. J. Sowerby. Min. Conch., t. 637, fig. 3, 1846. 
Testa minimd transversd, ovata, obliqua, tumidd, valde inequilaterali, levigata, polita ; 
anticé majiore et longiore, utrinque rotundata ; dente cardinali unico, dentibus lateralibus 
magnis. 
Shell small, transverse, ovate, oblique, tumid, very inequilateral, smooth, and 
glossy ; anterior side much the larger and longer, both sides rounded; hinge with 
one cardinal tooth, and two lateral teeth. 
Diameter, =;th of an inch. 
Locality. Cor. Crag, Sutton. 
This is a very abundant shell at the above locality, where the two valves are 
often found united, their large and prominent teeth having kept them in their natural 
position. 
Without allowing a latitude in variation beyond what we are accustomed to do, 
even with such variable species as were the inhabitants of the Crag Seas, this shell 
can scarcely be admitted as an identity with the A. rwéra, although it bears a close 
approximation ; and as the Malacologists have placed the recent shell in Ke//ia, it is 
thought best to follow their example, although it does not strictly accord in its dental 
characters with the diagnosis of that Genus. 
Our shell is more inequilateral than A. rwdra, and the hinge is quite at the side, 
the umbo being almost terminal, and the posterior lateral tooth then forms nearly a 
right angle with the beak and anterior lateral tooth: in the recent shell the hinge 
is much more central, with less of gloss upon the exterior; ours was perhaps a more 
transparent shell, with the teeth rather less distinct: thus differing more from the 
Mediterranean shell, according to Messrs. Forbes and Hanley, than from the British; 
there are two prominent lateral teeth, with a central one in the right valve, and 
two smaller nearly obsolete lateral teeth in the left valve. 
