MOLLUSCA. 687 



An examination of numerous examples from southern localities 

 in the collection of the National Museum at Washington has 

 shown that G. infracarinata is not distinct from G. crenata, one 

 species having been described from internal casts and the other 

 from examples with the shell preserved. The type of G. spillmani 

 Gabb, preserved in the collection of the Philadelphia Academy 

 of Science, is also not distinct from G. crenata. 



Formation and locality. Merchantville clay-marl, near Mata- 

 wan (ioo 4 , 101), near Jamesburg (141), Lenola (163) ; Wood- 

 bury clay, near Haddonfield (183) ; Wenonah sand, near Craw- 

 fords Corner ( I26 3 ) . 



Geographic distribution. New Jersey, Alabama, Mississippi. 



Gyrodes altispira (Gabb). 

 Plate LXXVIL, Figs. 19-21. 



1861. ? Lunatia altispira Gabb, Proc. Acad. Nat. Sci. Phil. 



(1861), p. 320. 

 1 86 1 ? Gyrodes obtusivolva Gabb, Proc. Acad. Nat. Sci. Phil. 



(1861), p. 320. 

 1864. Lunatia ? altispira Meek, Check List Inv. Foss. N. A., 



Cret. and Jur., p. 20. 

 1864. Gyrodes ? obtusivolva Meek, Check List Inv. Foss. N. 



A., Cret. and Jur., p. 21. 

 1868. Lunatia altispira Con., Cook's Geol. N. J., p. 729. 



1868. Gyrodes obtusivolva Con., Cook's Geol. N. J., p. 729. 



1869. Lunatia obtusivolva Con., Am. Jour. Conch., vol. 5, p. 



45, P 1 - *, % II - 

 1892. Gyrodes obtusivolva Whitf., Pal. N. J., vol. 2 (Monog. 



U. S. G. S., vol. 18), p. 129, pi. 1 6, figs. 9-12. 

 1905. Gyrodes altispira Johns., Proc. Acad. Nat. Sci. Phil. 



(1905), p. 21. 

 1905. Gyrodes obtusivolva Johns., Proc. Acad. Nat. Sci. Phil. 



(1905), p. 21. 



Description. "Shell, as known from internal casts, of mod- 

 erate size, somewhat erect, obliquely subglobose with a moder- 



