INSTITUTE OF SCIENCE, PHILADELPHIA. I9 



shallow sulcus outside the cycloidal pillar, vertex with a spirally grooved or 

 irregular surface ; pillar with a flattened or roughly sulcata face below, rounded 

 above ; interior smooth ; shell widening as it grows, the edge imperfect in the 

 specimens ; height 28 ; breadth (broken) 25 ; thickness of shell up to 5.0 mm. 

 Lower Miocene shell-bed, Alum Bluff, Western Florida. 

 This is the first species of the genus described from our Tertiaries, and re- 

 calls the original type D. Rnmphii, which is, however, less spiral and regular 

 in form. 



Family TESTACELLID^. 

 Genus GLANDINA Schumacher. 

 Q-landina truncata Gmelin. 

 Glandina truncata Binney, Terr. Moll. U. S., II. p. 301, plates lix., Ix. 

 Caloosahatchie beds, not common ; Dall, Willcox. 

 Grlandina truncata var. ovata. 

 Caloosahatchie beds, one specimen ; Dall. 



G-landina truncata var. macer. 

 G. irimcata var. W. G. Binney, Terr. Moll. U. S., IV., plate Ixxx., figure 9, 1S59. 

 Caloosahatchie beds, one specimen ; Dall. 



The above are doubtless varieties of one species, though very different in 

 proportions. They measure, respectively, 64x22.5 mm; 44x25 mm; and 

 75 X 20 mm. ; the color, sculpture and number of whorls being the same. Pre- 

 cisely the same variations occur in the living specimens of the same region at 

 the present day. 



Family HELICID^. 



Genus HELIX Linn^. 



Subgenus Polygyra Say. 



Polygyra cereolus naicrodonta Dall. 



P. cereolus microdonta Dall, Proc. U. S. Nat. Mus. 1S85, p. 266, 1S85. 



Rare in the Caloosahatchie beds ; Dall. 



I believe that the upper layers of the Caloosahatchie beds were deposited 

 in shallow fresh-water lagoons with little dry land in the vicinity. That only 

 three specimens of shells strictly belonging to the dry-land fauna should have 

 been found among the thousands of fresh-water shells, though terrestrial 

 Pulmonata were specially searched for, I regard as strong evidence in favor of 

 the belief mentioned. Glandina and Snccinea are not exceptions to the case, 

 for they both frequent wet situations. 



Family SUCCINEIDyE. 

 Genus SUCCINEA Draparnaud. 

 Succinea luteola Gould. 

 6". luteola Gould (1848), Binney, L. and F. W. Shells N. Am., I., p. 261, fig. 466, 1869. 

 One specimen in the Caloosahatchie marl. 



