84 
ELLIPSOLITES compressus. 
TAB. XXXVIII. 
Spec. Cuar. Shell flat, smooth; margin broad, 
flat, perpendicular to the sides; volutions four 
or five, almost wholly exposed; aperture ob- 
long, rectangular. 
ne Te 
Boru sides are alike, the greater diameter is about one- 
fourth longer than the lesser; the thickness about one-fourth 
of the shorter diameter. 
This singular production is from the Black-rock range, 
discovered nearly at the same time by the two gentlemen 
who discovered that of tab. 32. The upper specimen 
is partly composed of crystallized Carbonate of Lime, 
commonly called Iceland Spar, see tab. 2, Brit. Min. with 
the. diagonal striae mentioned at tab. 260, Brit. Min. The 
regularity and order of the volutions are very apparent, but 
the crystallization seems to have helped to obliterate the 
chambers, if ever there were any: or rather the solution of 
such parts has proceeded far before the mould was filled. 
Some parts are rather rough, and a little ochraceous. 
The under shell appears to be the same species, although 
it is rather more elliptic. Both seem to have been included 
in a very solid part of the rock, as appears from the frag- 
ments which adhere to them. 
