VERTIGO. 101 



others there may be minute traces of the upper-palatal fold 

 and an angular lamella, but still other examples have only 

 two teeth, no palatal folds being developed. Type 162884 

 A. N. S. P., from 2 to 10 miles up Rock Creek, northeast of 

 Garrison, Montana, collected by H. Burrington Baker. It was 

 taken also near the head of Wallowa Lake, Wallowa Co., 

 Oregon, and at Aneroid Lake, about 8 miles south. 



Vertigo milium Gld., var. Plate 21, figs. 16, 17. 



Vol. 25, p. 146. Specimens from Rio Guayubin at crossing 

 of Sabaneta Road, northwestern Santo Domingo, are figured 

 to show the slightly different race of that island. The shell 

 differs from V. milium by the decidedly shorter lower-palatal 

 fold, which is wholly visible in a direct front view (but in 

 milium longer, the end passing out of view), and by the heavy, 

 calloused columellar lamella. In milium the inner end turns 

 downward, but in antillarum it is brought forward almost as 

 far as the upper end, the space between the two ends being 

 largely filled with callus. The shell is of a compact, oval 

 shape, finely striate, especially the penult whorl. The speci-; 

 mens figured are No. 160406 A. N. S. P., collected by A. A. 

 Olsson. 



Chinese Species. 



Vertigo teilhardi Ping and Yen. Plate 24, figs. 7, 8, 9. 



"Shell minute, rimate, ovoid. Apex very small, slightly 

 higher than first whorl. Whorls about 4i/^, increasing gradual 

 in first two and gradually in last two. Body whorl more than 

 % of the total length of the shell. Surfaces of the first two 

 whorls moderately convex, while that of the last two more 

 convex, body whorl with its base much reduced. Apex and 

 first three whorls look free from striae under ordinary magni- 

 fying lens, and body whorl with extremely fine striae, which 

 become a wrinkle or crease close to the aperture. Sutures well 

 developed, distinct owing to convex surfaces of whorls. Aper- 

 ture somewhat cardiform, if the inwardly bent outer lip be 

 taken as its base. It bears 6 teeth within : the parietal tooth 

 slightly larger than the angular which is small but not obsolete. 



