THE NAUTILUS. 



VOL. XIX. AUGUST, 1905. No. 4. 



LAND SHELLS OF THE FLORIDA KEYS. 



BY HENRY A. PILSBRY. 



During the spring of 1904 Mr. Clarence B. Moore made an 

 exploration of the Keys of Florida primarily for archaeological re- 

 search, from Key Marco southward to Cape Sable and Long Key, 

 then northward on the East Coast to Lake Worth. During this 

 cruise he collected shells, particularly Liguus and Oxystyla. The 

 latter will form the subject of special report. Subsequently he sent 

 Messrs. Fowler and Brown, of the academy staff, to the outer keys, 

 Key West to Duck Key. The land shells collected are enumerated 

 below. In addition to the species of the Keys I have included those 

 taken at Cape Sable. The fauna of the mainland at that place is 

 related to that of the Keys, being practically insulated by the ever- 

 glades which extend across the peninsula. 



With the exception of Key West and Key Largo, very few 

 records of land shells have heretofore been made from the Keys, and 

 from many of them no mollusks whatever have hitherto been repor- 

 ted. The prevalence of the same species on most of the Keys sup- 

 ports Professor A. Agassiz's theory that that land area is in process 

 of disintegration, the present islets being remnants of a once con- 

 tinous land-mass. 



Cyclostornatidse. 



Ghondropoma dentatum Say. Two miles east of Planter, Key 

 Largo, East end Windly's Island or Umbrella Key, Lignum Vitte 

 Key, West end Upper Matacumbe Key, Summerland Key, Big 

 Pine Key, Little Pine Key, Sugar-loaf Creek, Sugar-loaf Key and 

 Key West. 



