Occasional Papers of the Museum of Zoology 13 



A. Apex coloration: from dark chestnut to practically 

 colorless. 



B. Varices. These dark bands, which appear to corre- 

 spond to former resting periods in peristomal growth, are not 

 very prominent in my shells, but as many as 3 occur on some 

 of the specimens. A break in the color-pattern quite commonly 

 occurs at the varices. For instance, in one shell the coloration 

 of the major portion of the spire approaches trifasciata Pilsbry, 

 although with less prominent color-pattern, but this changes 

 abruptly, on the last whorl, to a pattern resembling crossei von 

 Martens. 



C. General coloration. Almost white to light brown; usu- 

 ally this background color becomes darker on the later growth. 



D. Flammulations. These may be almost black and quite 

 sharply marked, or each may be surrounded by a diffusely col- 

 ored border, as if the colors had "run." In some shells the 

 coloration is so diffuse that the flammulations are quite indis- 

 tinct. One shell is so diffusely colored that the axial bands 

 can only be seen near the varices, while the last whorl shows 

 four indistinct broad spiral zones of light brown. 



E. Angle-spots. These may not be identifiable ; they may 

 appear simply as three projections of each flammulation on 

 the side toward the aperture ; they may tend to become darker 

 than the remainder of the color-pattern, so as to give the 

 appearance of three broken spiral bands (trifracta Pilsbry) ; 

 or they may join up completely {fcntssaci von Martens). 

 When the flammulations are very indistinct or practically 

 absent, but three well-defined spiral bands are present, the col- 

 oration is like tricincta von Martens. None of my specimens 

 Ijelong to this last category, but one shell is even more diver- 



