372 TRANSACTIONS OF THE WAGNER FREE 



with his Natka caroliniana by Conrad, and subsequently reinstated by him, 

 -while he figures as an adult specimen an individual of a distinct species. It 

 grows to the height of half an inch, and would seem to be the depauperate 

 representative in the Miocene of N. vicksburgensis of the later Eocene. The 

 specimens from the Chipola beds are in a much better state of preservation 

 than those from the New Jersey marls. That from Costa Rica figured by 

 Gabb under the name of einimdoides does not seem to differ materially from a 

 well-grown heniicrypta. 



Polynices (Lunatia) internus Say. 



Plate 20, figure 7. 



Naiica inlerna Say, Journ. Acad. Nat. Sci. Phila., ist Ser. iv. pp. 125-6, pi. vii. fig. i, 1824. 

 Natica heros Tuomey and Holmes, Pleioc. Fos. S. C, p. 114, pi. 25, figs. 15 a, b, 1857; 



not of Say. 

 Natica heros Conrad [ex parte), Proc. Acad. Nat. Sci. Phila. for 1862, p. 565, etc. 

 Natica catenoides Conr. (pars), non S. Wood, Proc. Acad. Nat. Sci. 1862, p. 565. 

 Natica heroica Dall (MSS.), this paper, 'p. 213 ; name only. 



Chesapeake Miocene of St. Mary's River, Maryland, of Wilmington, 

 North Carolina, and of South Carolina ; Pliocene of the Waccamaw beds, S. 

 Car., Johnson. 



While Say's figure of his Natica interna is very bad, yet, taken in connec- 

 tion with his description, I have concluded it can refer only to the present 

 species, and therefore withdraw the manuscript name which I had intended to 

 apply to it. 



The Miocene NaticidcE of our Tertiary have hitherto been in a good deal 

 of confusion, partly owing to their poor state of preservation. In the present 

 group, beside L. hemicryfta, I recognize, after studying a large mass of material, 

 three species with well-marked characteristics, and easily separated when once 

 discriminated. They are : L. interna, L. caroliniana Conr. [pars) and L. heros 

 Say. Conrad confused all together for a long time, then named L. caroliniana, 

 but seemed afterward to forget which of the three he had separated, and applied 

 the name caroliniana to each in turn and also to L. heinicrypta, and finally 

 capped the climax by describing an entirely distinct Cretaceous species from 

 North Carolina under the name of Lunatia carolinensis. For a time also he 

 seems to have confounded L. interna with N. catenoides of the British Crag. 

 Under the circumstances, it is fortunate that the original caroliniana Conrad 

 (1841) had previously been described by the brothers Rogers, underthe name 

 of perspectiva, so that Conrad's name may be entirely expunged from the lists_ 



Lnnatia inter?ta may be discriminated by its low spire, its full and rounded 

 whorls, and by the characters of the umbilicus, which shows a marked sulcus 

 ascending spirally below a t'nickened, obscure rib, which are respectively in- 

 dicated in mature and perfect specimens by an emargination and a callus 

 on the pillar-lip. It has six or eight whorls, and attains a breadth of 26 and a 

 height of 28 mm. 



