24 FOSSILS FROM SOUTHERN UNITED STATES— D J LL. vol.xviii. 



ill front, but not quite continuous with the obliquely truncate pillar; 

 IDillar short, concave, with a strong- plait behind at its junction with 

 the body. Longitude of decollate tyi^e, 7.5 ; of last whorl, G ; of aperture, 

 4.5; maximum diameter, 2.5 mm. 



Habitat. — Chipola beds, with the last species. 



Types. — No. 113803, U. S. N. M.; also specimens in Mr. Aklrich's col- 

 lection. 



This is a peculiar and characteristic species not like any heretofore 

 known from American Tertiary or recent fauna', and easily recognized 

 by its slender, drawn-out form and sharp spiral sculpture. 



ACTION MYAKKANUS, new species. 



Shell rather slender, the aperture longer than the spire, the whorls 

 five beside the nucleus; outline pointed-ovate, suture distinct, not 

 impressed; sculpture of about -5 evenly distributed, spiral, punctate 

 grooves with wider interspaces; the interspaces are flattened and pol- 

 ished, with transverse incremental rug;ie; aperture rather narrow, the 

 outer liii thin, so that the sculpture is reflected on the inner surface, 

 anteriorly rounded and continuous, with a thin, short, arched pillar lip, 

 carrying one well-marked plait, with a deep groove behind it; base with 

 no trace of umbilicus. Longitude of shell, 8; of aperture, 5; max- 

 imum diameter of last whorl, 3.5 mm. 



Habitat. — Pliocene sands of the Myakka River, Florida; one speci- 

 men collected by Mr. Joseph Willcox. 



Type.—l^o. 113110, U. S. X. M. 



This is a shell more slender than the averag'e of the genus, but a good 

 deal stouter than A./kskIus, from which it is otherwise readily discrim- 

 inated by the evenly disposed spiral sculj)ture and the untruncate 

 pillar. 



RINGICULA SEMILIMATA, new species. 



Shell minute, of three and a half whorls; spire about equal to the 

 aperture; surface polished, suture distinct, not deep, the spire a little 

 turrited and rather pointed; whorls smooth behind the periphery, in 

 front of it evenly spirally grooved, with wider interspaces ; aperture 

 wide, with a thickened and reflected margin ; outer lii)S slightly patulous 

 and thickest at the middle; pillar with two strong plaits, the body with 

 comparatively little callus, only the oldest and most callous showing a 

 parietal denticle, the outer lip extending in front of the pillar, the canal 

 in the adult very narrow and oblique. The size varies. Latitude, 1 to 

 1.2; longitude, 1.5 to 2 mm. 



Habitat.— Chiiwlii beds (2212, 2213), Calhoun County, and Alum Bluff 

 beds, at Oak Grove, Santa Eosa County, Florida. 



Types. — Xo. 113111, U. S. X. M. ; also specimens in the collections of 

 Mr. Aldrich and the Geological Survey of Alabama. 



This species appears to be rather rare; it most nearly resembles R. 

 guppyi, Dall, which is grooved all over and has a less slender spire. 



