200 



HELICINiE. 



Species of Anchistoma. 



Ariadnse, Pfeiff. 

 auriculatuni, Say. 

 avarum, Say. 

 cereolum, Mtihlf. 

 cheilostropha, D'Orb. 

 clausum, Rqfin. 

 convexum, Fuifin. 

 Couloni, Shuttl. 

 dentiferum, Binn. 

 Dorfeuilleanum, Lea. 

 Edgarianum, Lea. 

 fallax, Say. 

 fraternum, Say. 

 germauutn, Gould. 

 heligmoideum, D'Orb. 

 Hindsi, Pfeif. 

 hippocrepis, Pfeiff. 

 hirsutum, Say. 

 Hopetonense, Shuttl. 

 Janeirense, Pfeiff. 

 labyrinthicum, Lea. 

 Lecontii, Lea. 



loricatum, Gould. 

 major, Binn. 

 microdonta, Desk. 

 monodon, Mat. and Rack. 

 obstricturo, Say. 

 oppilatum, Morel. 

 palliatum, Say. 

 paludosum, Pfeiff. 

 personatum, Lam. 

 pustulatum, Ferus. 

 Roeineri, Pfeiff. 

 Rugeli, Shuttl. 



Sayi, Binn. 



spinosum, Lea. 



Texasianurn, Moric. 



tridentatum, Say. 



Troostianuin, Lea. 



uvuliferurn, Shuttl. 



ventrosulum, Pfeiff. 



volvoxis, Parr. 



vultuosum, Gould. 



Yucataneuru, Morel. 



Sub-gen. mesodon, Rafinesque (Patera, Albers). 



Shell depressly globose, umbilicate, or with the perforation 

 covered, thin, costulately striated, last whorl defiexed ; aperture 

 rotundately lunar; peristome wide, white, angulately reflexed, 

 sometimes marginate internally ; inner lip often with an ele- 

 vated callus. 



albolabrum, Say. 

 appressum, Say. 

 Bethencourtianum, Shuttl. 

 Columbianum, Lea. 



elevatum, Say. 

 labiosum, Gould. 

 Michelinianum, Lea. 

 multilineatum, Say. 



