214 BULLETIN OF THE 



seen that the prevailing form is Polygyra, a group or subgenus pecu- 

 liarly American, represented in the Interior Region indeed, but meet- 

 ing its greatest development here. The presence of Glandina and 

 Veronicella shows, also, the more southern character of land-shell fauna. 

 But the Region, and especially that portion of it from whence the fauna 

 was distributed, i. e. the southern extremity of Florida, is still more 

 peculiar in showing the connection between the land shells of the con- 

 tinent of North America and those of the West India Islands and the 

 Spanish Main. Of the species given above (p. 213), CylindrcUa jejuna 

 was, perhaps, introduced from Cuba, and Bulimulus Dormani may prove 

 identical with B. maculatus, Lea, of Carthagena. The following species 

 have evidently been introduced* from the West India fauna: — f 



Zonites Gundlachi, Cuba, etc. Bulimulus Marielinus, Cuba. 



Patula vortex, Cuba, etc. Strophia incana, Cuba. 



Helix varians, New Providence. Stenogyra subula, Cuba, etc. 

 Cylindrella Poeyana, Cuba. gracillima, Cuba, etc. 



Macroceramus Kieneri, Cuba. Liguus fasciatus, Cuba. 



Gossei, Cuba. Orthalicus undatus, Cuba. 



From Yucatan one species has been introduced, Helix oppilata. 

 Orthalicus zebra, found in several of the Florida keys, is, no doubt, of 

 foreign origin, though from what point introduced it is difficult to say. 

 It has been found in Mexico in the Sierra Madre, and in Maranhon. 

 Bulimulus multilineatus was introduced \ from the continent of South 

 America, where it has been found at St. Martha, N. Granada, and at 

 Maracaibo and Pto. Cabello in Venezuela. 



Florida has not only received several of its species from the West 

 Indies, but also from its southern extremity it has contributed in return 

 to the fauna of those islands. From hence, no doubt, Zonites arboreus 

 has passed into Cuba and Guadaloupe ; Zonites minusculus to Cuba, 

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

 to Cuba ; Zonites indentatns to San Domingo? 



* Either by oceanic currents since the formation of the peninsula of Florida, or 

 else from some island of the West India group, now enclosed in the peninsula. It 

 is interesting in this connection to refer to the discovery, by Mr. Conrad, of a Ter- 

 tiary fossil at Tampa Bay, Bulimus Floridanus, Cojir. See also below, p. 217. 



t Also several non-pulmonate species, as Helicina subglobulosa, Cuba ; Ctevopoma 

 rugulosum, Cuba ; Chondropoma dentatum, Cuba. 



t See note t to p. 21G. 



