19 
PS0 D D C T IT S gji ran tens, 
£3 O 
TAB, CCCXX, 
Spec. Char. Transversely oblong, with dilated 
sides, and rugose irregular striae, longitu- 
dinally undulated ; larger valve gibbose. 
Syn. Conch. Anomites giganteus. Marlin 
Pet. Perl), tab. 15. 
-Measuring from the edge to the highest part of the 
gibbose valve the length is equal to the width, but from 
the front to the hinge it is much less : the expanded 
sides do not form distinct ears, but are rather pointed : 
there is in general a more prominent elevation near the 
front, other ways the undulations are very irregular, and 
often branched : the striae are extremely irregular, much 
branched, and inosculated : they are numerous. The 
cast of the interior is very remarkable, but not so striking 
as that exhibited in the next plate, which it somewhat 
resembles. 
Two views of a Derbyshire specimen given me by 
Mr. Martin are represented upon this plate ; it is ac- 
. compaiiied by P. Martini. 1 have the same species 
from Yorkshire. 
t 
