204 



MOLLUSKS: GASTEEOPODS. 



Fig. 388. — Cerithium. 

 Much reduced. Molucca. 



Fig. 389. — Melania. 

 Western States. 



Fig. 390.- lo. 

 Southern States. 



Fig. 391. — Tower- 

 Shell, or Turritella. 

 "West Indies. 



Fig. 392. — Wentle-trap. 

 Keduced. China. 



Fig. 393. — Worm- 

 Shell, or Vermetus. 

 West Indies. 



Fig, 394. — Fig. 39.5. - 

 Periwinkle, Lacuna, 

 or Litorina. 



Fig. 396. — 

 Valvata. 

 XT. States. 



Fig. 397. — River Snail-Shell, 

 or Paludina. United States, 



