Il6 FLORIDA GEOLOGICAL SURVEY ELEVENTH ANNUAL REPORT. 
logical time discrimination can be made, except in the time sequence 
of deposit. 
In addition to the above collections, there are in the U. S. Na- 
tional Museum the following forms : 
From Wells at DeLand Landing. 
Area plicatura Conrad — depth not given. 
Area limula Conrad — depth not given. 
Scapharea ( Scapharca ) identified as transversa Say, labelled Pliocene in age.. 
Depth not indicated. 
Phacoides waccamazvensis Dali, var. ? — depth not given. 
From Well in DeLand. 
Midinia identified as congesta Conrad, labelled Miocene in age. Taken at 
a depth of 30 feet below the surface. 
Oliva literata Say. Taken at a depth of 36 to 54 feet. 
. From DeLand. 
Mulinia identified as congesta, var. contracta Conr. ; labelled Miocene in age. 
Discussion of the fauna in the upper and lower beds at the marl 
pit about one mile south of DeLand, Fla. 
Number of species of mollusks considered in time range 45 
Percentage of species with varieties considered in time range, that are be- 
lieved to continue to the Recent 64+ 
Number of species with varieties considered in time range, exclusively 
Miocene ( ? 1 ) 
Number of species with varieties considered in time range, reported not 
lower than the Pliocene (including the Carolinas) 8 
Number of species with varieties, considered in time range, not younger than 
the Pliocene (including the Carolinas) 11 
Percentage of species with varieties, considered in time range, in the Flor- 
ida Pliocene 82+ 
Percentage of species with varieties, considered in time range, in the Wac- 
camaw marl of the Carolinas 84+ 
The following species at DeLand appear to be lacking in the 
Caloosahatchee Pliocene; those preceded by query are questionably 
found : 
