159 
INOCERAMUS latus. 
TAB. DLXXXII—ig. 1. 
Spec. Cuar. Ovato-rhomboidal, depressed, con- 
centrically undulated ; valves equal; anterior 
side * concave ; posterior side broad, expand- 
ed towards the very oblique hinge line ; beaks 
small, short. 
Syn. Inoceramus latus. Mantell, Geol. Suss. 216. 
t. 27. f. 10. 
teeta. ." - seem 
A warce flat species, almost uniformly covered with 
large, slightly elevated, angularly bent undulations or 
ridges, and sharp stria. The part upon which the hinge 
line is placed does not form a lobe, but is an almost 
smooth projection, that completes the rhomboidal form 
of the margin. The regularity and obliquity of the un- 
dulations distinguish this from I. Cuvieri, which is either 
plain, or has a few large irregular waves upon its sur- 
face. 
At the time Inoceramus Cuvieri was published in 
‘¢ Mineral Conchology,” I did not possess characteristic 
specimens of the I. latus. Such have been supplied by 
C. B. Rose, Esq. from the Upper Chalk near Swaffham, 
Norfolk. In size it equals I. Cuvieri, acquiring eighteen 
inches or more in length. The front is often suddenly 
deflected. 
* In the descriptions of the species of Inoceramus formerly 
given, this is called the posterior side ; whereas the side upon 
which the ligament of the hinge is placed is the posterior. 
