34 University of Michigan 



The specimens show considerable variation in size ; from 

 individuals seen in copulation, it appears that the males are 

 usually smaller and less globose than the females. Extremes 

 measure : 



Altitude Greatest diameter Height aperture Diameter aperture 



12.4 mm. 107 (13.3 mm.) 55 (6.8 mm.) 63 (7.8 mm.) 



9.3 mm. Ill (10.3 mm.) 62 (5.8 mm.) 66 (6.1 mm.) 



9.1 mm. 117 (10.7 mm.) 67 (6.1 mm.) 73 (6.6 mm.) 



The color variation in this lot may be divided into the fol- 

 lowing classes, which do not appear to be related to habitat : 



(a) General coloration: from milky-white and yellowish- 

 brown to orange and wine-colored. Ten specimens out of the 

 total number were uniformly light-colored, while 3 were uni- 

 formly wine-colored. In the former case, the colored bands 

 are certainly absent ; in the latter, they may be obscured by 

 the dark ground-color. 



(b) One broad, dark band, just above the greatest ventri- 

 cosity of each whorl, and reaching almost to the suture above 

 (42 specimens). This band is either orange or wine-colored, 

 and may be distinct or diffuse. Some of these specimens also 

 show the broken stripe of class (dj, which forms a lower 

 margin to the one considered here. 



(cj Two broad bands, with a light band between (3 speci- 

 mens). The second band is just below the greatest ventri- 

 cosity of the whorls, and varies in color with the other. 



(d) A fine, broken stripe of colored dashes, at the position 

 of the lower edge of the band in class (b) and often present 

 at its lower border. Seventeen specimens have no other mark- 

 ing ; it varies in color like the bands. 



(e) A diffuse tint on the base which begins at the position 

 of the lower edge of the second band in class (c), but which 

 does not occur with it. Eight specimens have the band in 

 class (b) and this basal coloration. 



