376 ADDITIONS AND CORRECTIONS. 



tempting the separation of the various races of the mode si <r 

 series by means of variations in the number of teeth alone. 

 It chances that the specimen chosen as type is one of the 

 3-toothed forms. 



"The animal is bluish-gray or slate in color, the body quite 

 chirk, the foot and peripheral portions much lighter and semi- 

 transparent. A rough sketch of the cephalic region of one of 

 the Falls Creek specimens is offered in fig. 6. 



"Whether the hereditary value of this race is that of a 

 'form' or a subspecies can only be shown by the more de- 

 tailed study which must be left for the future. Until then 

 the personal equation must necessarily largely govern. In 

 any ease it will prove useful to have a name for it" (Berry)* 



VERTIGO ALLYNIANA Berry. Fig. 7. 



'The shell is minute, short, robust, ovate-conic in outline, 

 thin, dark reddish-brown in color, with only a dull gloss: 

 weakly, irregularly striate. The spire tapers with increasing 

 rapidity from the last whorl to the obtuse apex. The whorls 

 are convex, the last having a shallow but distinct excavation 

 in the palatal region and a weaker one over the upper palatal 

 tooth, the latter extending to the lip, which thus becomes 

 flattened or very slightly indented on its outer segment. The 

 aperture is pyriform in outline, and would be rather small 

 except for the quite flaring lip, which is little thickened and 

 very fragile at the edge. There are 5 teeth constantly de- 

 veloped in all the material examined. The parietal, columel- 

 lar, and upper and lower palatal lamella? are well developed, 

 and there is a distinct, though small angular lamella. The 

 columellar is situated well back in the aperture and quite 

 high up on the pillar. The low T er palatal is also rather deeply 

 immersed. 



"Length of type 2.1; diameter to lip edge 1.3; length of 

 aperture 0.81 mm. ; whorls 4%. 



"Type: Cat. no. 3764 of the writer's collection. Paratypes 

 in the Academy of Natural Sciences of Philadelphia, and the 

 private collection of Allyn G. Smith. 



