THE NAUTILUS. 135 
It isa long time since I paid particular attention to these small 
snails, but I do not think the above can be correct. 
The genuine V. coloradensis is a very small form, with only a 
single lamella on the parietal wall; its length is 14 mm. The form 
which I named concinnula I found at higher elevations; it is larger, 
2 mm. long, cylindrical, dull brown with whitish strize, whorls 43, 
striate, suture not very deep, mouth pyriform, usually elbowed ex- 
ternally above, lamellze 4 or 5; one, double, on parietal wall; one 
on columella, about its middle, and two on outer wall; peristome 
distinct. This differs from decora in color and the shape of the 
aperture. 
I did not publish a description of my concinnula, because I be- 
lieved (and still believe) it to be identical with Ancey’s ingersolli, 
which, also unpublished, had priority in MS. But, in view of Mr. 
Dall’s publication, it becomes necessary to refer to it and explain 
what it really is. 
Now as to ingersolli, it was based on Ingersoll’s supposed califor- 
nica. Mr. J. H. Thomson sent me some of the “californica” col- 
lected by Ingersoll, and I transcribe my notes upon them :— 
No. 6. “Animas Valley, Colo.” and “Timber Line, N. E. Ante- 
lope Pk., V. californica Rowell.” (Perhaps only the latter label 
really belongs to the shells.) Certainly not californica, but appar- 
ently concinnula. 
No.7. “ Vertigo californica Rowell, Rio La Plata, Colo.” Rather 
highly colored, but evidently concinnula. 
No.8. “V. californica, Cunningham Gulch.” Shinier than usual, 
perhaps, or thinner, but concinnula. 
There was also a single specimen of the same species from North 
Park, collected by E. A. Barber, Aug. 12, 1874. 
Typical V. decora is 2} mm. long, therefore much larger than 
coloradensis. It is to me evident that there are three quite distinet 
forms: (1) True decora of the north; (2) ingersolli or concinnula of 
high elevations in Colorado; (3) coloradensis of the Colorado mid- 
alpine. Whether these are called species or subspecies is, perhaps, 
of small importance, and Dr. Sterki may be allowed to decide. 
I may later refer to some other matters in Dr. Dall’s excellent 
paper. He keeps “ Zimax montanus” as a species, which it certainly 
isnot. The Patula strigosa v. concentrata Dall, seems to be a form 
similar to my var. minor (J. of Conch., 1890, p. 175), which forms a 
distinct race near Egeria, Colorado. 
