84 POST-PLEIOCENE FOSSILS. 



Chemnitzia interrupta, Gould, Invert, of Mass., p. 268, fig. 173. 



Chemnitzia interrupta, Stimpson, Boston So. Nat. Hist., Proceed., Vol. 4, p. 16. 



Chemnitzia interrupta, Stimpson, Shells of New-England, p. 41. 



Turbonilla interrupta, H. Sf A Adams, Gen. Mollusca, Vol. i, p. 231. 



Description. There is onlj a slight difference in this shell from the two first named 

 species, T. exarata, and T. nivea, (page 83.) Like the last named, the ribs are straight^ 

 but more numerous, and the grooves are crossed by about fourteen fine revolving lines, 

 which are interrupted by the ribs; in some specimens the lines appear to be in pairs when 

 seen through a lens. 



Plate XIII. Fig. 4, Natural size. 

 " 4o, Magnified. 

 " 4:b, Magnifed rib and groove. 



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



TURBONILLA. CANCELLATA. — {Neio Species.) 



Plate XIII. Figs. 6, 6a, 66. 



Description. The whorls of this species are more inflated than any of the foregoing; 

 the sutures are deeper and angular, and the grooves are crossed by four lines, one 

 equidistant from the sutures, and a pair in the middle. To the unassisted eye the shell 

 appears beautifully cancellated. 



Plate XIII. Fig. 6, Natural size. 

 " 6o, Magnified. 

 " 6J, Magnified ribs, grooves, and revolving lines. 



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



