N A T I C I D M . 83 



This is a very abundant shell in the Post-Pleiocene of South-Carolina. Mr. Lea's 

 specimen was obtained by Professor Tuomey from the Meiocene of Virginia. It is also 

 living on the Southern coast. 



Plate XIII. Fig. 2, Shell, natural size. 



" 2a, Magnified view of same, 

 " 2b, Magnified ribs and groove. 



Locality. Simmons'. Museum, College of Charleston; Cabinet F. S. H 



TU KB ON ILL A NIVEA.-H. & A. Adams. 

 Plate XIII. Figs. S, 3a, 3&. 



Chemnitzia nivea, Stimpson, Pro. Boston N. H. Society, Vol. 4, p. 114. 

 Chemnitzia nivea, Stimpson, Shells of New-England, p. 40. 

 Turbonilla nivea, H. $ A. Adams, Gen. Mollusca, Vol. 1, p. 231. 



Description. This shell differs from T. exarata in having the grooves and ribs 

 straight and not obliquely longitudinal. 



Mr. Stimpson dredged it at the mouth of the Bay of Fundy in fifty fathoms ; it is living 

 on the Carolina and Georgia sea shores, and very abundant as a fossil in the Post-Pleiocene 

 beds. 



Plate XIII. Fig. 3, Natural size. 



" 3a, Magnified view. 



" 3b, Ribs and groove magnified. 



Locality. John's Island ; Cainhoy ; Simmons'. 



Museum, College of Charleston. 



TURBONILLA INTEERUPTA.-H. & A . Adams. 

 Plate XIII. Figs. 4, 4a, 4b. 



Turritella interrupta, Totten, Silliman's Jour. Sci., Vol. xxviii, p. 352, fig. 7. 

 Turritella interrupta, C. B. Adams, Boston Jour. Nat. Hist., Vol. ii, p. 275, 



