40 PROCEEDINGS OF THE ACADEMY OF [Feb., 



Observations. — In 1889,* Dall referred to Eulima (Leiostraca) 

 stenostoma Sars, a form collected off Fernandina, Florida. In 

 1890 (see synonomy), he separated it under the name of Eulima 

 {Leiostraca) rectiuscula and united with it some forms collected 

 from the Caloosahatchie. The Tertiary shells are, however, quite 

 distinct from the recent individuals in question: the whorls of 

 the latter are much more numerous, — probably 15 in a perfect 

 specimen of the Recent shell instead of only 11 or 10 as in the 

 fossil, — and the spire includes fully two-thirds of the total altitude 

 of the shell instead of not more than half of it. 



Distribution. — Yorktown Formation. ^ mile below Suffolk water 

 works dam, Nansemond County, Virginia. Duplin Formation. 

 Natural Well, \\ miles north of Magnolia, Duplin County, North 

 Carolina. Muldrow's Place, 5 miles southeast of Mayesville, 

 Sumter County, South Carolina. Caloosahatchie Formation. 

 Caloosahatchie River, Florida. 



Collections. — U. S. National Museum. Johns Hopkins Uni- 

 versity. Academy of Natural Sciences of Philadelphia. 



Caecum fleiuingi new species. Plate IV, flg. 5. 



General Characters. — Shell a gently arcuate tube, slightly smaller 

 at the anterior end than at the posterior. 



Protoconch. — Protoconch not preserved. Plug ungulate — a min- 

 ute, dextrally truncated cone set well to the right of the median 

 vertical. 



Sculpture. — External surface smooth excepting for microscopic- 

 ally fine, irregular, incremental striae. 



Aperture. — Aperture oblique to the horizontal axis, — the margin 

 faintly, but perceptibly, contracted. 



Dimensions. — Altitude, 3.8 mm. Diameter of aperture, 1.2 

 mm. Diameter of posterior extremity, 1.0 mm. 



Type Locality. — Neill's Eddy Landing, 3 miles north of Cronley, 

 Columbus County, North Carolina. Waccamaw Formation. 



Observations. — The only constant difference which separated 

 Ccecum flemingi from Ccecum virginianum Meyer, of the York- 

 town Formation, is the contraction of the anterior aperture. 

 No trace of this is discernible in any one of the many Yorktown 

 individuals examined, while, on the other hand, it is a diagnostic 

 of every perfect adult from the Duplin and Waccamaw. The 

 Yorktown forms, furthermore, run a little larger, and perhaps 



♦ Dall, 1889, Bull. U. S. National Museum, No. 37, p. 126. 



