AIR-BREATHING SNAILS AND SLUGS 



291 



White Mountains of New Mex- 

 ico by Rev. E. H. Ashmun. 

 The diameter is 17 millimeters. 

 Some of the specimens of this 

 species have a white tooth on 

 the columella, as is shown in 

 the figure; in others it is very 

 small or absent altogether. 



Aslimu7iella pseudodonta^ 

 Dall, the False-toothed Snail. 

 Figure 280 gives us two en- 

 larged views of this shell. I 

 have a specimen which is nearly 



three- 



Fig. 280, X 1 (*) 



Fig. 281. X I (*) 



fourths 



of an inch across in its largest 

 diameter. It is distinctly horn- 

 colored, but is nearly smooth, 

 showing lines of growth but no 

 ridges. It has a very faint be- 

 ginning of a tooth. Other 

 specimens are smaller, and 

 more nearly resemble the figure. 

 Ashmunella asJiniuni^ Dall, 

 Ashmun's Snail. Three en- 

 larged views of this pretty little 

 shell are given in Figure 281. 

 The diameter is 14 millimeters. 

 The horn-colored whorls are 

 crossed by a great number of 

 very fine lines of growth. One 

 of my specimens shows a very 



