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The specimen figured happens to be nearly smooth ; on the spire there 

 are some obscure oblique wrinkles. A specimen from the hammock shows 

 strong, irregular ribbing, of which there are only traces seen on the one 

 figured. All the specimens obtained at Ballast Point, where it seems rare, 

 seem to have been more or less worn before being fossilized. This is the first 

 species of Nerita described from the Atlantic Tertiary rocks, and resembles 

 some of the Pacific coast recent species more than it does the recent species 

 of the Atlantic coast and the West Indies. 



There are a number of Californian fossils of the genus. 



Genus NBRITINA Lamarck. 



Neritina chipolana n. s. 



Plate 23, figure 19. 



Older Miocene of the Chipola beds, Chipola River, Calhoun Co., Florida, 

 Burns. 



Shell small, polished, smooth, with a low spire and three whorls ; nucleus 

 swollen, prominent, suture distinct ; general form resembling that of 7\^. /z^/a 

 L. ; aperture produced, the outer margin thin, the body with a moderately 

 thick callus ; at the base of the pillar-lip is a slight projection, outside of which 

 the callus is impressed ; pillar above this prominence irregularly and minutely 

 denticulate, the teeth when continuously present numbering ten or twelve. 

 Alt. of shell 5.0; max. diam. 5.3 mm. 



This neat little shell retains its color-markings, which are composed of 

 dark, narrow lines radiating from the axis and over the whorl in every conceiv- 

 able form of zigzag or curve, either singly' or in groups of three to five, either 

 continuous or broken. In general, however, there is much more of the surface 

 of an individual free from lines than covered by them — a feature apparently 

 characteristic of this form. Some rare varieties of N. virginea Lam exhibit 

 much such a style of painting, but in that species when little triangles are 

 formed the line bounding the triangle behind is always broader than elsewhere, 

 giving the effect of a shadow ; in N. chipolana the lines are not widened. Size 

 and coloration being considered, there is no recent American species which 

 approaches this one very closely. 



Neritina (Theodoxus ?) edentula n. s. 

 Plate 19, figure 11. 

 Pliocene of the Caloosahatchie and Shell Creek, F"lorida, Dall and 

 Willcox. 



Shell small, smooth, or striated by incremental lines, with a depressed 

 spire and about three whorls ; aperture oblique, outer margin thin and sharp ; 

 body with a rather thick callus; pillar smooth or very obscurely striated, 

 edentulous. Alt. 5.9; max. Ion. 5.6 mm. 



The type-specimen has lost its color-markings, but many of the other 



