1897.] 



NATURAL SCIENCES OF PHILADELPHIA. 



365 



DESCRIPTIONS OF TWO NEW SPECIES OF CEEION. 



BY H. A. PILSBRY AND E. G. VANATTA. 

 Cerion Fordii P. & V. Fig*. 1, 2. 



Fig. 1. Fig. 2. Fig. 3. Fig. 4. Fig. 5. 



Shell cylindrical, the latter three whorls of equal diameter, those 

 earlier forming a rather short, obtuse cone. Whorls 10 to 10£, 

 earlier two white, smooth, the following finely striated, stria? or rib- 

 lets evenly spaced though of variable closeness, in number 32 to 45 

 on the last or next to last whorl, not splitting or more numerous on 

 the base of the shell, which is rounded, not compressed ; umbilical 

 chink short, subperforate. Color: longitudinally mottled with 

 brown, ochre and snow-white ; sometimes uniform white. 



Aperture vertical or with the base somewhat advanced ; parietal 

 tooth about median, high, long and strong, extending backward 

 about four millimeters. Columellar fold very slight, situated high. 

 Peristome reflexed, its face much thickened ; light brown or whit- 

 ish ; parietal wall generally heavily calloused. 



Alt. 30, diam. of penult, whorl 12, alt. aperture 12? mm. 



Alt. 27, diam. of penult, whorl 12, alt. aperture 10£ mm. 



Alt. 28J, diam. of penult, whorl 11, alt. aperture 11 mm. 

 Var. submarmoratum P. & Y. Figs. 3, 4. 



Like the type except that it is ribless, smooth with slight growth- 

 wrinkles; sutures a little exserted and seam-like above. White, 

 unicolored or with irregular longitudinal dark fleshy brown stripes 

 and sometimes ochraceous stains. The first post-nepiouic whorl of 

 the cone is usually striated. Aperture typical. 



