160 Marine Shells of the Western Coast of Florida 



escape of young. Perry has seen Anachis penetrate capsules 

 and devour the young embryos. 



Anachis avara similis-s^ (Ravenel) PI. 31, fig. 225 



Alt. to 10 mm. Characters of shape and color those of A. avara 

 semiplicata, about one-third smaller; six whorls; 17 or 18 axial 

 ribs, intercostal spaces spirally striate, strongest below. In juvenile 

 specimens body whorl is slightly angulate at base. 



Abundant on grassy bottom in shallow water. 

 Anachis obesa^ss (c. B. Adams) PI. 32, fig. 226 



Alt., 4-6 mm. Shell small, ventricose, rotund; five whorls, spire 

 almost half of height; sutures distinct, excavated; axial ribs, inter- 

 costal spiral striations; aperture oval, oblique; outer lip thin in young 

 specimens, thickened and denticulate in adult; base of columella 

 denticulate. 



Abundant on weedy bottoms. Many found among branching 

 hydroid colonies and on shells of living Atrina. 



Genus NITIDELLA Swainson, 1840 

 Nitidella nitidula^a* (Sowerby) PI. 51, fig. 346 



Alt., 9 mm. Shell oblong-ovate, smooth, shining, whitish, 

 marbled with brown; spire short and acute, of about two whorls, 

 followed by five or six rounded whorls; sutures distinct. The body 

 whorl is 7 mm. in length, rounded, 4 or 5 mm. in diameter slightly 

 above center of the shell. Aperture the length of the body whorl, 

 anal canal narrow and deeply notched; columella sinuous, with two 

 small plications; outer lip thickened, denticulate within; operculum 

 corneous, small. 



Littoral regions, under rocks and detritus. 



Genus tOLUMBELLA Lamarck, 1799 

 Columbella-05 rusticoides-"« Heilprin PI. 31, fig. 223 



Alt., 28 mm. Small, ovate, smooth; white ground color macu- 

 lated and reticulated with bright chestnut-brown; soft, hispid epi- 

 dermis; six or seven convex whorls, spire short, acute; body whorl 



'9- Lat., similis, like. 

 293 Lat., obesus, fat, stout. 



291 Lat., nitidus, shining, sleek, fat; nitcJula, field-mouse, shrew-mouse. 

 — Cicero. 



295 Lat., columna, column; bella, pretty, elegant. 



296 Gr., russus, russet, red. 



