CATALOGUE OF SHELLS. 129 
9. U. Olivareus Lea. W. Laidlay. 
Moradabad, Kalindree N. Maldah. 
LOpe is 
Sylhet. 
ie Oe eelicatus: Dr. Gowan. 
China. 
Exhibits the method employed by the Chinese to obtain pearls 
by the introduction of beads or other foreign substances be- 
tween the mantle and shell of the living animal, 
12, U. Atrocostatus (?). 
12a. U. Undulatus Barnar. 
Ohio, Miami. 
This shell is undistinguishable from the last, though differently 
named. 
b. young. 
13. U. Tumidus Retz. 
Europe. 
14. U. Gibbosus Lea. Von de Busch. 
Ohio. 
15. U. Ovatus. 
Massachussets. 
16. U. —— : 
Labelled U. Gibbosus but quite distinct from Neo, 1. 
17. U. Flexuosus. 
18. U. Canosus, 
Ohio. 
