66 
LUTRARIA ? carinifera. 
TAB. DXXXIV — jig. 2. 
Spec. Char. Transversely oval, elongated, convex, 
longitudinally striated ; posterior side smooth, 
bounded by an obtuse carina, truncated, its 
edge straight. 
About twice as wide as long : the surface is largely un- 
dulated ; the longitudinal striae do not cover much more 
than the anterior half of the v alves, and even there are 
lost near the edge. 
A curious shell, the produce of the Lower Chalk at 
Dowlands. Drawn from a specimen in the cabinet of 
H. T. De la Beche, Esq. 
LUTRARIA ? oblata. 
TAB. DXXXIV.— 3. 
Spec. Char. Compressed, transversely oval, with 
obtuse extremities slightly bent ; umbones pro- 
minent. 
A smooth but rather antiquated shell, nearly twice as 
wide as long : it has a small carina near the superior 
margin of the posterior side. The shell is curved to- 
wards the right valve ; it has a deep sinus in the im- 
pression, left by the edge of the mantle, and has more 
the general aspect of Lutraria than of Anatina ; but we 
cannot decide to which genus it belongs. The shell is 
pearly, which is rather a character of Anatina than Lu- 
traria. 
Discovered in the Sandstone of Bognor Rocks, and 
now in the possession of Thrupp, Esq. 
