102 BULLETIN 90, UNITED STATES NATIONAL MUSEUM. 



Genus AMNICOLA Gould and Haldeman. 



Amnicola Gould and Haldeman, Inv. Mass., 1841, p. 228. Type, A. porata 



Say, as Paludina. 

 Leachia Risso, Hist. Nat. Eur. Mer., 1826, p. 102. First species, L. viri- 



descens Risso, Hist. Nat. Eur. Mer., 1826, fig. 35. Not Leachia Leseuer, 



1821. 

 Microna Zieoler, fide Stimpson, Hydrobiinoe, p. 4. 1865. 



AMNICOLA ADESTA, new species. 

 Plate 1, fig. 7. 



Shell minute, smooth with 5 whorls; nucleus minute not differen- 

 tiated from the succeeding whorls, rather blunt; whorls plumply 

 rounded with a deep suture between them; at the end of the penul- 

 timate whorl is a constriction marking the place of a former resting 

 stage ; aperture sublunate, peritreme complete, simple, slightly thick- 

 ened, pillar lip slightly separated from the body whorls with a 

 chink behind it, extending across the body to the posterior sutural 

 commissure of the aperture; base rounded. Height 3.2, maximum 

 diameter 1.7 mm. 



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



One specimen from the Post collection, U. S. Nat. Mus. No. 

 165023. 



AMNICOLA, sp. indet. 



A defective specimen of an Amnicola, different from A. adesta, 

 but too imperfect to describe, was collected by Mr. Post. It is short 

 and stout and notable for its inflated whorls and very deep constric- 

 tion at the suture. U. S. Nat. Mus. No. 214742. 



Genus CRUCIBULUM Schumacher. 



Crucibuhim Schumacher, Essai, p. 182, 1817. Type, Calyptro'a chinensis 



Lamarck. 



Section DISPOTAEA Say. 



Dispotaea Say, Journ. Acad. Nat. Sci. Phila., vol. 4, p. 131, 1824. Type, 

 Calyptraea costata Say. 



CRUCIBULUM CONSTRICTUM Conrad. 



Dispotaea constricta Conrad, Bull. Nat. Inst., vol. 2, p. 194, pi. 1, fig. 2, 1842 ; 



Fos. Med. Tert., p. 80, pi. 45, fig. 4, 1845. 

 Crucibiilum costata Tuomey and Holmes, Pleioc. fo«?. S. Car., p. 107, pi. 25, 



fig. 4, 1857 : not of Say. 

 Crucihulum constrirtmn Dall, Trans. Wagner Inst., vol. 3, pt. 2, p. 350, 1892. 



Oligocene of Jericho, New Jersey, and of the Tampa silex beds at 

 Ballast Point, Tampa Bay, Florida, Burns and Dall; Miocene of 

 the Choptank River, and St. Mary's County, Maryland ; of the James 



