INSTITUTE OF SCIENCE, PHILADELPHIA. 5 I 



Caloosahatchie beds, rare. Recent on the Southern Antilles and northern 

 shores of South America. 



A single, not mature specimen of a shell which is referable to this species 

 or to M. piilclwa Gray was collected by me from the Caloosahatchie marls. 



Marginella aurora n. s. 

 Plate 6, figure 4 a. 



Miocene beds of the Chipola River, N. W. Florida, a stratum probably 

 somewhat later than the silex-beds of Tampa. 



Shell large, strong, with a short but sharp spire, and about five whorls; 

 suture obscure ; outer lip thick, strong, a channel behind it externally, inner 

 edge finely irregularly denticulate; aperture narrow, posterior commissure ex- 

 tended to the third whorl from the nucleus, wider anteriorly ; pillar with four 

 subequal plaits, the anterior pair contiguous ; body moderately callous; shell 

 showing traces of a rich orange color, perhaps originally red, uniformly dif- 

 fused. Max. Ion. of shell 26.0; lat. 14.5 mm. 



The form is that of prunwn, with a higher spire, different lip and a pos- 

 terior commissure like that of M. carnea. 



Marginella denticulata Conrad. 



Plate 5, figure 8. 



Marginella denticulata Conrad, Journ. Acad. Nat. Sci. vi. p. 225, plate i.x. fig. 21, 1830 



(not of Tate, 1878). Miocene, Md. 

 Marginella eburneola Conrad, Journ. Acad. Nat. Sci. vii. p. 141, 1834. Mioc. Va. 

 Marginella denticulata Conrad, Foss. Med. Tert. Form. U. S., p. 86, pi. 49, fig. 10 (1845). 

 Marginella eburneola Conrad, Foss. Med. Tert. Form. U. S., p. 86 (not pi. 49, fig. 11, which 



is M. limatuld Conr.), 1845 (not 1838). 

 Porcellana {Glabella) denticulata Conrad, Proc. Acad. Nat. Sci. Phila. 1862, p. 564, 1S62.- 

 Porcellana {Glabella) eburneola Proc. Acad. Nat. Sci. Phila. 1862, p. 564, 1862. 

 Prunum eburneola Conrad, Am. Jour. Conch. IV. p. 67, pi. 5, fig. i, i86S. 

 Marginella elevata Emmons, Rep. N. C. Geol. Sur., p. 262, fig. 138, 1S5S. 

 Marginella {Glabella) opaUna Stearns, Proc. Boston Soc. Nat. Hist. xv. p. 21, 1872 ; recent, 



W. Florida. 



Range, from the Miocene of Maryland and Virginia to the Pliocene (Ca- 

 loosahatchie beds) and living on the coast of the United States from Cape 

 Hatteras to Florida and in the Antilles to Barbados. 



Perhaps no instance is more glaring of the singular carelessness by which 

 the late Mr. Conrad marred his, in some respects, valuable paleontological 

 work, than the history of this species. Described by him in 1830, with an 

 unrecognizable figure, four years later he repeats the same diagnosis almost 

 verbatim, and gives a new name with it, but no figure. In the Fossils of the 

 Medial Tertiary of the United States, we have a publication begun in 1838, 



