38 A MANUAL OF AMERICAN LAND SHELLS. 



has passed into Cuba aud.Guadaloupe; Zonites minusculus to Cuba, 

 Jamaica, Porto Rico (Bermuda?); Pupa fallax to Cuba; Vertigo ovata 

 to Cuba; Zonites indentatus to San "Domingo? 



From the various sources indicated above, the southern extremity of 

 Florida has become inhabited by about seventy species of land shells, a 

 number small in comparison with those found in the Cumberland Sub- 

 region (see p. 34), but large when compared with those found in the 

 great Interior Region. 



In addition to those species apparently originating in the peninsula 

 of Florida and thence spreading over the whole Southern Region, there 

 is found within its limits a number of species confined to the southwest- 

 ern portion of the latter. These seem restricted to the southern part 

 of Texas, which may be considered an oflTshoot of the Mexican launa, as 

 shown by the i)resence of the genera characteristic of that country, such 

 as Holospira, BuUmulus, and Glandina. Within the region, however, 

 are many species peculiar to it, but belonging to the genera charac- 

 teristic of JS"orth America, such as Polygyra and Mesodon. It seems, 

 therefore, best to consider Texas as belonging equally to (he fauna of 

 North America and of Mexico, being the point where the two overlap. 

 As the limits of the region are ill defined, several species extralimital 

 to the State of Texas are included in the following catalogue of the 

 Texan Region : 



Glandina Vanuxemensis. Triodopsis Copei. 



decussata. Levettei. 



bullata. Mesodon divestus. 



Texasiana. Eoemeri. 



Zonites significans. Dorcasia Berlandieriana. 



caducas. griseola. 



Micropliysa incrustata. BuUmulus patriarcha. 

 Strohila Huhbardi. alternatus. 



Polygyra ventrosula. Scliiedeanus, 



Hindsi. Macroceramiis Oossei. 



Texasiana. Holospira Goldfussi. 



triodontoides. Roemeri. 



Mooreana. Stenogyra octonoides. 



tholus. Pupa pelliicida. 



hippocrepis. Su^cinea Haleana. 



Jaclisoni. concorMalis. 



Ariadne. ■ luteola. 



vuUuosa. iSalleana. 



