1877.] The Flora and Fauna of the Florida Keys. 143 
Bahamian forms, as the distances are not too great to be trav- 
ersed by most flying insects. It would be an interesting study 
for an entomologist to find out how far North American species 
have adapted themselves to the West Indian flora, and how far 
they have varied under this influence. 
With regard to the land shells, I am enabled by the kindness 
of Mr. Thomas Bland, to give more extended lists than in the 
other departments. Mr. Bland, not content to give me the ben- 
efit of his own large stock of knowledge, has spared no pains to 
gather all the information within reach, principally from Mr. W. 
G. Binney and Mr. W. W. Calkins. 
Mr. Binney remarks that the fauna of the keys is quite the 
same as that of the mainland from Tampa Bay to the Miami 
River, and that this fauna is about equally derived from the 
great “ Southern Province” of the eastern region of North Amer- 
ica and from the West Indies, and gives the following lists in 
corroboration : — 
Spectes CERTAINLY DERIVED FROM THE ‘‘ SOUTHERN 
Region”? op NORTH America, NOT FROM WEST WEST INDIAN SPECIES FOUND IN FLORIDA. 
INDIES. 
Glandina truncata, everywhere. Zonites Gundlachi, Key West. 
Succinea campestris Key West. Patula vortex, mainland and keys. 
Polygyra Carpenteriana, Key West, Key | Helix varians, Key West to Key Hiara 
ey 
iscayne. Cylindrella Poeyana, Miami River, 
Polygyra septemvolva, Key West. st. 
h cereolus Pi Macroceranus pontificus,! Miami River to 
r uvulifera, “ Tampa. 
Pupa variolosa, r Macroceranus Gossei, Little Sarasota Bay. 
. "Saar J ulimus marietinus, Miami River. 
, Tupicola, $ Strophia incana, mainland and keys 
Helix pulchella, > Stenogyra octonoides, Miami River. 
Zonites minusculus, s Stenogyra gracillima, Miami River, Key 
Helicina orbiculata, “ est. ; 
Lignus fasciatus, Miami River, Key West. 
Orthalicus undatus, “‘ si 
ndropoma dentatum, Miami River, 
ey West. Sa ee 
Cylindrella jejuna, Miami River, Key 
West. 
From Mr. Calkins’ list I add P. incana from Key West to- 
Key Biscayne. That some species which are common to some 
of the West India Islands and to South Florida have had their 
origin in North America and spread from there, as stated by 
Mr. Binney, is a fact very difficult to account for. The currents 
are decidedly against it, and a former connection of the land not 
confirmed by a study of other classes. 
We may recapitulate as follows from these notes, imperfect as 
1 Key West (Calkins). 
