107 
LUCINA mitis. 
TAB. DLVII. —Jig. 1. 
Spec. Char. Orbicular, convex, ornamented with 
minute, longitudinal striae,, and numerous small, 
regular, concentric laminae ; lunette oval, very 
concave ; cardinal teeth obscure ; no lateral 
tooth. 
Lucina mitis, Deshayes MSS. 
The concentric laminae are beautifully regular, the spaces 
between them are crossed by minute irregular striae : 
within, the surface is rough, but not marked with sunken 
puntums, as many of the genus are ; it is in these two 
characters we conceive this species to differ from B. ele- 
gans (Deshayes, i. p. 101, t. 14, f. 10, 11.), of which we 
have no authentic specimen. Specimens of L. mitis, 
sent us >y Mons. Deshayes, agree precisely with the 
shell before us. 
Found abundantly in Barton Cliff by Miss Bemister. 
