56 TRANSACTIONS OF THE WAGNER FREE 



sort of vortex over the spire, as expressed by the incremental Hnes. Max. 

 Ion. of shell 8.3 ; max. lat. 5.7 mm. 



Miocene of Virginia and Pliocene of the Caloosahatchie beds, not rare. 



This form is discussed under the head of the preceding. It is erroneously- 

 labeled A'l. ovula Conrad, in the collection of the Philadelphia Academy 

 of Natural Sciences. 



Marginella (Volutella) ovuliformis Orbigny. 

 Marginella ovuliformis Orbigny, Moll. Cuba, ii. p. loi, pi. xx. figs. 33-35, 1842. (Not of 



Gabb, Journ. Acad. Nat. Sci. Phila., new ser. viii. p. 355, pi. 46, fig. 39, 1881 ; = M. 



Gabbi Dall.) 



Caloosahatchie beds. Recent on the southern coast from North Carolina 

 to Florida, and in the Antilles. 



This species, distinguished by its three plaits, small size, rotundity, narrow 

 aperture and moderately thickened outer lip, is not rare in the marls. 



Marginella (Volutella) amiantula n. s. 

 Plate 5, figure 9. 



Shell minute, elongate-egg-shaped, smooth, with involute spire ; aperture 

 rather narrow, subequal, little arched ; outer lip moderately thickened, smooth 

 inside, sulcus behind it very faint; inner lip not callous, with four oblique 

 plaits, the anterior pair much the stronger ; siphonal commissure excavated, 

 apical commissure narrow. Max. Ion. 2.5 ; lat. 1.25 mm. 



Rare in the Caloosahatchie marl. 



This little species is the most elongate and cylindrical in form of any of 

 the species. M. ( F!) amianta Dall, which is the most closely allied in form to 

 this, is more pyriform, has the inner lip denticulated, the plications equal and 

 similar, and the outer lip proportionately thicker and more prominent. 



The following revision of our other previously known fossil Marginellidm, 

 which was necessarily made - while endeavoring to determine the species 

 enumerated in this paper, m.ay be of use to some other students. The capital 

 letters following the names refer to the formations in which they are found. 

 Eocene, Miocene, Pliocene, Post-Pliocene and Recent. C =^ Claiborne sands. 



M. amabilis Redfield, 1852, M. P. R. 



M. americana (Conrad MS.) Redfield, 1871, E. C. ; = M. columba Lea. 



M. ariatina Lea ; = M. crassilabra Conrad. 



M. antiqua Redfield, 1852, M. P. 



M. apicina Menke, P. R., 1828. 



M. avena (Val.) Gabb, 1881, P. 



M. bella Conrad, 1862, M. P. R. 



M. biplicata Lea, 1S33, E. C. (non Risso) ; = Ringicula sp. 



M. chrysomelina Redfield, 1848, P. R. 



M. columba Lea, 1833, E. C. 



M. coni/onnis Sowerby, 1850, M. ; = M. guttata Dillwyn, R. 



