232 



CERION, GROUP VIII. 



high, narrow and inconspicuous from in front'. Parietal lamella low, 

 small, varying from moderately short to long, central in position. 



Length 31J, diam. 11 mill. 



Length 33, diam. 12J mill, (average typical specimen). 



Length 38, diam. 13 mill. 



Bahamas: Turk's Island (Gabb, Swift). 



G. regina P. & V., Proc. Acad. Nat. Sci. Phila. 1895, p. 208 

 (June 18), with varieties percostata, comes, swiftii, eucosmia and 

 brevispira; 1896, pp. 320, 330, pi. 11, f. 23, 24; with varieties 

 comes (p. 320), eucosmium (p. 321, pi. 11, f. 21), percostatum 

 (p. 321, pi. 11, f. 22), swiftii (p. 321) and brevispirum (p. 321, pi. 

 11, f. 25) ? Pupa maritima SOWB., Conch. Icon, xx, pi. 3, f. 20. 



This species is allied to C. regium, which it resembles in the con- 

 spicuous excavation or flattening of the last whorl below the umbili- 

 cal groove, and in the usually more or less open umbilicus. 



Form percostatum P. and V. PI. 34, fig. 12. 



Form of shell and mouth as in C. regina ; but the whole surface 

 except the nepionic apex is regularly ribbed, as in C. album Mayn., ex- 

 cept that the ribs on the cylindrical portion are wider spaced. 

 White, much mottled and clouded with brown. Holds the same 

 relation to C. regina that album holds toward lentiginosum. Length 

 35^; diam. 13 mill.; often smaller in the same proportions, or com- 

 paratively wider. Mouth longer than in C. album Mayn. Turk's 

 Island. 



Form comes P. and V. PI. 34, fig. 16. 



Shell with the form, size and sculpture of G. regina, but coloring 

 of 01 lentiginosum Mayn.; heavily streaked and marbled with chest- 

 nut brown, on the cone finely speckled and zigzagged. Turk's 

 Island. (Swift, Gabb, et al) 



Form swiftii P. and V. PI. 34, figs. 13, 14. 



Shell with the elongated form and large, excavated umbilical tract 

 of G. regina, but smaller, thinner, distinctly tapering from the body- 

 whorl upward ; parietal callus very heavy in adults, parietal lamella 

 low, deep-seated. Last two whorls rather distinctly ribbed. Color 

 varying from white, to chestnut, streaked and speckled with white. 

 Length 26, diam. 10 mill. Turk's Island. (C. Blume, in Robert 

 Swift collection, A. N. S.) 



