426 



THE OCEAN WORLD. 



whether it be globulous, as in Fig. 196, tun-bottomed, as in Fig. 197, 

 plain or biform, as in Fig. 198, or truncated, as in Figs. 199 and 200. 

 These figures will give the reader some idea of the multiplied and 

 elegant forms which the shells of the genus Helix sometimes assume. 



Fig. 201. — Helix citrina (Linnaeus). 



Fig. 202. — Helix Stuartia (Sowerby). 



In connection with the genus Helix we shall note some kindred 

 genera which our space only permits us to name. Such is the genus 

 Bulimiis, the European species of which are numerous; some of them 



Figs. 203 and 204. — Bulimus sultanus (Lamarck). 



very small, others of medium size ; of these Bulimus sulta?ms (Figs. 

 203 and 204). In Figs. 205 and 206, the Berry Pupa {Pupa uva), as 

 an example of another genus, is represented. 



Yet another typical form may be noted, which is found abund- 

 antly amid the grass and in shrubs near brooks round Paris and 

 elsewhere. It is Succi?iea putris, presenting a small, thin, diaphanous 



