THE NAUTILUS. 125 



UNIONID^ OF GA., ALA., S. C, AND LA., IN SOUTH FLORIDA. 



BY 8. HART WRIGHT, PENX YAN, N. Y. 



An interestiug fact in geographical distribution is noted in the 

 finding of Unionidae in Central and Southern Florida, which belong 

 to, or were originally described as from the Central States of the 

 South. In Volusia County, Fla., over one hundred miles south of 

 Jacksonville and more than three hundred miles .south of the mid- 

 dle portions of Ga. and Ala., several species of Unio have been 

 found which were described from the latter States, or from S. C. 



The St. Johns River flows northward past Volusia County, to 

 Jacksonville and the Atlantic Ocean ; and the introduction of Ga., 

 Ala. and S. C. species against the current of the river for so great 

 a distance is remarkable. Although the Unionidae have locomo- 

 tion in a slight degree and might make headway against rivers and 

 creeks, when once in them, they cannot thus get into waters which 

 do not connect. Their introduction into remote regions may be 

 through the agency of water-birds, which might carry juveniles long 

 distances, and then drop them into new stations. 



We found in Volusia Co., Fla., in 1887, the following species 

 supposed to be transplanted from Georgia : Unio Dariensis Lea, U. 

 cicur Lea and Anodonta Couperiana Lea, perhaps the most beauti- 

 ful Anodonta in America, and the only one found in Florida of 

 which we have any knowledge. We also found there, U. modioli- 

 forviis Lea and U. angnstatus Lea, both from South Carolina. Mr. 

 Charles T. Simpson found in Manatee County, one hundred and 

 fifty miles farther south and on the west side of the state, U. obesns 

 Lea and U. gramdatus Lea, from Ga. and Alabama. Mr. George 

 W. Webster sent us a few weeks ago, a species he found in Lake 

 Co., west of Volusia Co., which proved to be U. hepaticus Lea, from 

 Ga. and S. C. U. opacus Lea, from Ga. and U. nigerrimus Lea, 

 from La. have been reported from middle Florida. None of the 

 species indigenous to Southern Florida, so fur as we can learn, have 

 ever been found in anv of the other Southern States. 



NOTES ON THE CLASSIFICATION OF AMERICAN LAND SNAILS. 



BY H. A. PILSBRY. 



Since the })ublication of my Check-list of American Land Shells, 

 many new forms (species, varieties and absolute synonyms) have 



