28 TRANSACTIONS OF THE WAGNER FREE 



Conus daucus Linn6. 

 Young specimens (to 25.0 mm. long) were found in the Caloosahatchie 

 beds, which, after careful comparison, seemed referable here. The line of 

 relationship connecting the Eocene Comts saiiridens, the Miocene C. planiceps 

 and the present fossil specimens, seems to culminate in the recent specimens 

 of C. daucus, which, with many similar characters, reach a size and develop- 

 ment somewhat superior to any of their precursors. 



Conus sp. indet. 

 Casts of a species of Conus were obtained at White Beach, indicating a spe- 

 cies larger than any of the recent species of the region, with a very flattened 

 spire, the apex being slightly raised, the whorls smooth and convexly rounded, 

 with deep sutures ; sides of the shell straight and smooth (unless near the canal, 

 which is broken) ; whorls about 14. Max. diam. of internal cast 47.0, Ion. 

 (est.) 75.0 mm. 



This form, though larger, resembles most the largest flat-spired variety of 

 Conus papilionaceous Hwass, now living in Floridian waters. 



Family PLEUROTOMIDvE. 



Genus PLEUROTOMA Lamarck. 



Pleurotoma albida Perry. 



Plate 4, figure 8 a. 



Pleurolonia albida Perry, Conch., e.xpl. pi. xxxii. fig. 4, 1811. Dall, Blake Report, Gastr., 



p. 72, 1889. 

 Pleurotcjna hailensis Sowerby, Quart. Journ. Geol. Soc. vi. p. 50, 1849. 

 Pleurotoma Barretti Guppy, Quart. Journ. Geol. Soc. xxii. p. 290, pi. xvii. fig. 6, 1866. 



(Miocene, Santo Domingo.) 

 Pleurolonia cochlearis Conrad, Journ. Acad. Nat. Sci. Phil., 2d ser. i, p. 115, pi. xi. fig. 



23 (bad), 184S. 

 Pleurotoma virgo Lamarck. 



Later Eocene of Vicksburg, Mississippi; Miocene of Western Florida, 

 Santo Domingo and Borden, Jamaica ; silex-beds of Ballast Point, Tampa 

 Bay, Florida ; Pliocene marls of Caloosahatchie River, Florida ; recent, in the 

 Gulf of Mexico and the Antilles, in 26 to 125 fathoms. 



This is a remarkable species. Its genealogy is complete for a period which 

 it would be difficult to estimate in terms of years. The Eocene specimens 

 agree exactly with recent specimens of the same size, and vary within the 

 same limits. It is very probable, however, that they never attained the size of 

 some of the recent specimens. Conrad's figure is incredibly bad, but I have 

 compared authentic specimens of the fossils. 



Pleurotoma servata Conrad. 

 Pleurotoma servata Conrad, Jour. Acad. Nat. Sci. Phila., 2d ser. i, p. 115, pi. xi. fig. 



18 (poor), 1848. 



Later Eocene of Vicksburg, Mississippi ; Miocene of Ballast Point silex- 

 beds, Tampa Bay, Florida. 



