15 



lasalle county species. 



FAMILY HELICID^. 



SUBFAMILY VITRININ^. 



(JENUS MACROCYCLIS— BECK. 



!»IACICOCV<;i.IS CO-^CAVA, Say. 



Shell flattened, whirls Ave, umbilicus broad and 

 deep, shell striate, lip acnte, horn color, breadth one- 

 half inch. This species is abundant, they are fond of 

 animal food; their movements are active; the shell 

 resembles M. vancowGerensis, Lea. but is not so larn(( 

 and differs in other respects. 



<;i:--\t>i ZO.^TTKS, MoNTKOUD. 



Zoiiitc<« arboroiis. Say. Shell thin and depressed, 

 \\ iiirls four and a half, lip acute, light horn color, one 

 fourth inch in diamete]-. ISTpt abundant.* 



