4 CYPR^EA. 



is abundant for that purpose, and the result is a small, 

 heavy shell. If late, the supply of calcifying secretion has 

 been used up in the formation of a large shell before the 

 thickening process begins. 



In the following descriptions of species, I have endea- 

 voured to avoid extremes in adopting or rejecting specific 

 distinctions. Many doubtful cases there are that cannot be 

 absolutely decided. In such cases I have endeavoured 

 simply to state what the supposed distinctions are, leaving 

 it to collectors to use their own judgment as to their value. 



The following arrangement of species is adopted, as best 

 tending to bring together those that are most nearly allied. 



A. Ctpb^a proper. Columella ending in a lobe and plait. 



* Dorsal margins not pitted. 



1. More or less cylindrical. Ex. Argus, lurida, felina 



stolida. Sp. 1-31. 



2. More or less ovate, with dilated sides and flat bases 



Ex. Achatina, leucodon, mappa, moneta, mus. Sp. 32- 

 52. 



3. Same as 2, but with vertically-produced extremities. 



Ex. Stercoraria, Scottii. Sp. 53-57. 



4. Ovate or pyriform. Ex. Tigris, subviridis, lynx, xantho 



don, pallida, Saulia, pyriformis, onyx, angustata. Sp 

 58-105. 



5. South- African species with wide apertures, not margined 



on the left side. Ex. Algoensis, fusco-dentata, sirnilis 



Capensis. Sp. 106-111. 



** Dorsal margins pitied. Ex. Cribraria, Lamarckii, erosa, gan 



grsenosa, kelvola. Sp. 112-135. 



*** Ribbed or tuberculated, or allied to those that are so. Ex 



Adamsoni, staphylaea, pustulata, cicercula, Childreni, nucleus 



Sp. 136-145. 



B. Cypr.ka, subgenus Trivia. Columella without distinct lobe or plait 



Dorsal ribs radiating from central line. 

 * Narrow apertures, outer lip broad. Ex. Radians, pediculus 

 australis, oryza, sanguinea, Europasa. Sp. 146-184. 



** Wide apertures, outer lip narrow. Ex. Oniscus, rosea. Sp. 184- 

 188. 



Species. 



A. Columella ending in a lobe and plait. 



* Dorsal margins not pitted. 



Group 1. More or less cylindrical, with moderately thickened 



sides. 



1. testudinaeia, Linn., (f. 83, 84).— C. testa crassa, cy- 



