204 



MOLLUSKS: GASTEROPODS. 



Fig. 388. Cerithium. 

 Much reduced. Molucca. 



Fig. 389. Melania, 

 Western States, 



Fig. 390. la 

 Southern States, 



Fig. 391. Tower- 

 Shell, or Turritella, 

 West Indies, 



Fig. 392. Wentle-trap, 

 Reduced. China, 



Fig. 393. Worm- 

 Shell, or Vermetusv 

 West Indies. 



Fig. 394. 

 Periwinkle, 

 or Litorina. 



Fig. 395. 

 Lacttna. 



Fig. 3%. 

 Valvata. 



IT. States. 



Fig. 397. River Snail-Shell, 

 or Paludina, United States 



