54 BULLETIN 90, UNITED STATES NATIONAL MUSEUM. 



MARGINELLA BALLISTA Dall. 



Plate 16, fig. 12. 



Marginclla hallista Dall, Trans. Wagner Inst., vol. 3, pt. 1, p. 47, pi. 4, 

 fig. 6, 1890. 



Tampa silex beds, at Ballast Point, Tampa Bay, Florida; Dall. 

 U. S. Nat. Mus. No. 112906. 



This has a peculiarly rounded form and thickened outer lip desti- 

 tute of internal denticulation. 



MARGINELLA TAMPAE Dall. 

 Plate 11, fig. 6. 



MargineUa (balUsta var.?) tampae Dall. Trans. "Wagner Inst., vol. 3, pt. 1, 

 p. 47, Aug., 1S90. 



Tampa silex beds, at Ballast Point, Tampa Bay, Florida; Dall. 

 U. S. Nat. Mus. No. 112097. 



It was at first thought this might be a variety of M. haUisfa, but 

 the examination of a larger number of specimens leads to the con- 

 clusion that it is distinct. The nearest species to it thus far noted is 

 M. incrassata Nelson from the Peruvian Tertiary, which has a lower 

 spire, one less plait, and a thinner outer lip. 



MARGINELLA LIMATULA Conrad. 



Plate 11, fig. 7. 



MargineUa limatula Conrad, Jouru. Acad. Nat. Sci. Phila., vol .7, p. 140, 

 1834; Fossils Medial Tert. U. S., p. 86, pL 49, fig. 9 (err. for fig. 11 fide 

 Conrad iti litt.) 1845. — Dall, Trans. Wagner Inst., vol. 3, pt. 1, p. 49, 

 1890. 



Porcellana limatula Tuomey and Holmes, Pleioc. foss. S. Car., p. 130, 

 pi. 27, figs. 10, 11, 1857. 



MargineUa roscida Redfield, Proc. Acad. Nat. Sci. Phila., vol. 12, p. 174, 

 1860. 



Prumim limatula Conrad, Amer. Journ. Concli., vol. 4, p. 67, pi. 6, fig. 5, 

 1868. 



Oligocene of the White Beach sandstone (and the Tampa silex 

 beds?) Burns and Dall; Miocene of Virginia, the Carolinas and 

 Florida; Pliocene of South Carolina and Florida, on the Caloosa- 

 hatchee and Shell Creek; living abundantly off the Carolina coast in 

 25 to 100 fathoms, on a bottom of sand and gravel. U. S. Nat. Mus. 

 No. 11462. 



This is a species rather northern in its present range and has not 

 so far been found living in Floridian waters. Some of the Pliocene 

 specimens show traces of white flecks, somewhat like those of the 

 M. nivosa Hinds, a marking which is much less common in the recent 



