APPENDIX 
I. 
ARTIFICIAL TABLE. 
This Artificial Table is merely intended to assist the student in 
the discovery of the genera, without any reference to their 
natural relations. The numbers refer to the pages in the body 
of the work. 
I. UNIVALVES. 
Shells consisting of a more or less conical valve. 
A. Shell jlat^ solid. 
Limax. Shell oval or oblong, without any visible spire.— p. 75. 
B. Shell conical. 
Ancylus. Shell conical, apex recurved rather to the right. — 
p. 216. 
Velletia. Shell conical, compressed ^ apex subcentral, bent 
to the left. — p . *220. 
C. Shell ear-shaped^ solid. 
Testacella.— p. 53. 
D. Shell conical^ spiral. 
a. Shell thin^ edge of lips not thickened or reflexed^ peristome 
not continued. 
* Mouth transverse^ lunate ; shell depressed. 
ViTRiNA. Shell imperforated; mouth large. — p. 85. 
ZoNiTES. Shell perforated, or umbilicated ; mouth moderate. 
— p. 89. 
(Helices, Pupa, Clausilia, &c., when young.) 
