215 
INOCERAMUS pictus. 
TAB. DCIV — fig. 1. 
Spec. Char. Oblong’, convex, wavy, nearly co- 
vered by small concentric furrows ; anterior 
side flattish, smooth ; valves equal. 
Intermediate between I. Brongniarti, t. 441. and 
I. striatus, t. 582. It resembles the first in length and the 
smoothness of the anterior side, its surface is furrowed 
like the latter, (which by the by the I. Brongniarti is ob- 
scurely,) but it is flatter than either. The most remark- 
able circumstance attending it is, that it is marked with 
broad stripes of a brown colour. 
Of this extraordinary shell we have seen but one spe- 
cimen, for the use of which we are indebted to our very 
scientific and liberal friend Mrs. Murchison. It was 
found in the Chalk Marl at Guildford. 
INOCERAMUS digitatus. 
TAB. DCIV.—/. 2. 
Spec. Char. Longitudinally furrowed ; furrows 
large, round, equal to the ribs between them. 
Many large round ribs and intermediate equal furrows 
crossed by the lines of growth distinguish this gigantic 
shell. 
Only small fragments of this species, which appears 
to exceed in size even the I. Cuvieri, have come under 
