72 BULLETIN 90, UNITED STATES NATIONAL MUSEUM. 



(not fully mature ?) thin, sharp, slightly arcuate behind. Length 

 of shell 9 mm. ; of last whorl 5 mm. ; maximum diameter 3 mm. 



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



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

 165084. 



Subgenus ASTYRIS H. and A. Adams. 



Astyris H. and A. Adams, Gen. Eec. MolL, vol. 1, p. 187, 1853; no type 

 selected.— D ALL, Proc. Boston, Soc. Nat. Hist, vol. 13, 1870, p. 242; 

 A. rosacea (Gould as Buccinum) . 



The group Alia H. and A. Adams sometimes united with this has 

 bright colored shells and seems sufficiently distinct to preserve both 

 names. 



ASTYRIS TURGIDULA Ball. 

 Plate 15, fig. 6. 



Astyris turgidula Dall, Trans. Wagner Inst., vol. 3, pt. 5, p. 1196, pi. 40, 

 fig. 126, 1900. 



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

 and Post. U. S. Nat. Mus. No. 130350, and 214439 (adult). 



The specimen figured lacks the thickened outer lip. A later ex- 

 ample retains it. 



ASTYRIS ELUTHERA, new species. 



Plate 12, fig. 12. 



Shell small, slender, subacute, smooth, with about 7 whorls ; ap)ical 

 whorl small, inflated, rounded; suture distinct but not deep; subse- 

 quent whorls moderately convex, gradually and imiformly increas- 

 ing in size, smooth, and without sculpture, except the last, which has 

 a small swollen varix behind the posterior part of the outer lip, and 

 on the canal half a dozen fine, sharp spiral grooves with somewhat 

 wider flattened interspaces; outer lip (defective) slightly thickened, 

 the posterior part remaining shows one internal liration and doubt- 

 less anteriorly there were others; body with a slight callus with the 

 edge free anteriorly ; pillar short, obliquely truncate in front, straight. 

 Length of shell 8, of last whorl 5.7, maximum diameter 3 mm. 



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



One specimen from the Post collection, U. S. Nat. Mus. No. 165082. 



ASTYRIS DICARIA, new species. 



Plate 4, fig. 2. 



Shell very small, smooth, short, with somewhat more than 4 

 whorls; suture very distinct, the whorls between moderately convex; 

 last whorl much the largest, base attenuately roimded ; aperture nar- 



