PLEIOCENE FOSSILS. 119 



and beads formed by transverse grooves on the whorl, which extend from the suture 

 to the periphery; periphery formed by a spiral raised line; base convex, striated; 

 umbilicus profound, crenulated; superior and basal margin of aperture angular. 



One of the most beautiful species of the genus; only a single specimen yet found. 



Plate XXVI. Fig. 4, Natural size. 



Locality. Pee Dee. Museum, College of Charleston. 



LITOFJMDiE. 



LITTORINA.— Fekruss. 



LITTORINA IRE OR ATA.— L-. R. Gibbes. 



Plate XXVI. Fig. 5. 



Turbo irrorata, Say, Jour. Acad. Nat, Sci., Vol. 2, p. 239. 



Littorina irrorata, L. R. Gibbes, Cat. Fauna So. Ca., appendix Tuomey's Geology, p. 20. 



L. testa crassa, turbinata; anfractibus lineis nunterosis elevatis obtusis mqualibus spires 

 modo intortis; basali aufractu mazirno; sutura bene designata; spira acuta; apertura 

 magna integra rotundo-ovata; labri margine tenuato; labio crasso. 



Description. Shell thick, top-shaped; whorls, with numerous revolving, elevated, 

 obtuse, equal lines; body-whorl very large; suture well defined; spire acute; aperture 

 large, entire, rounded-ovate ; outer edge of lip thin ; labium thick. 



This is a very common estuary shell from New-Jersey to Florida. A thousand living 

 specimens may at any time be collected, in a half-hour, from the mud-flats of Ashley 

 river. 



Plate XXVI. Fig. 5, Natural size. 



