35 
ASTARTE striata. 
TAB. D XX,— fig. 1. 
Spec. Char. Lenticular, transversely striated ; lu- 
nette ovate, flat, deeply sunk, shell thick. 
A very round shell, with small close beaks, and very 
numerous, regular, rounded furrows, or impressed striae ; 
the edge is obtuse, and probably entire. 
Drawn from a Chalcedony cast sent me from Black™ 
down. 
ASTARTE orbicularis. 
TAB. D XX.— fig. 2. 
Spec. Char. Lenticular, rather gibbose, concen- 
trically furrowed ; furrows small ; posterior 
surface plaited with an angle at its edge ; lu- 
nette elongated, very deep. 
The convexity of this shell is rather greatest towards 
the beaks ; the lunette is deeply sunk, and composed of 
two planes that meet at an acute angle in its middle ; the 
shell is very thick, and has elongated crenulations with- 
in its edge. 
Our specimens are from the Hampton Quarry near 
Bath : the shells are replaced by crystallized carbonate 
of lime, which has also retained the impression of the 
external ligament : they are imbedded in Oolite. 
