100 PROCEEDINGS OF THE ACADEMY OF [Vol. LXXV 
This species was, we believe, the first land snail described from 
Arizona. Newcomb’s type appears to have come from Frick, or 
at least he is given as authority for the locality “ Arizona.’”’ Whether 
Frick was a fortyniner who reached California by the Old Yuma 
Trail through Mexico and Arizona, we do not know. We know 
that he lived in Oahu for some years, and collected shells there; 
but no details of his life could be obtained. 
Binney, in 1869, confused Neweomb’s shell with Helix lohrii 
Gabb, a very different shell. His description appears to be com- 
posite, and only his upper figure is certainly identifiable as rowelli. 
The lower figure differs in lacking the parietal callus and in being 
larger. Fischer and Crosse followed Binney in this mistake: 
In 1882, Henry Prime reported ‘‘ Ampelita”’ rowelli from the Salt 
River Mountains, 7 miles south of Phoenix, Arizona, “‘determined 
by Dr. Newcomb.”’ We have seen some of these shells, which 
have a general resemblance to M. rowelli, but are really bleached 
Sonorella “‘bones” of an undescribed species. In 1905, one of us 
(H. A. P.) thought to recognize Newcomb’s species in certain small 
Sonorellas from Sanfords and the adjacent foothills of the Patagonia 
Mountains, Arizona: On comparison with the type specimen, it 
is seen that these shells are different, and the new name Sonorella 
tryoniana has been proposed for them. 
The type-specimen of M. rowelli, No. 27517 of the Newcomb 
collection, Cornell University, is represented in P.ate III, fig. 7. It 
is bleached white, but shows a narrow gray band above the peri- 
phery. The surface is glossy, finely, weakly striate. On the 
antepenult whorl the striz are slightly irregular, indistinctly broken 
into long granules. The apex is now broken, but the last part of 
the embryonic shell remains. It shows a sculpture entirely similar 
to that of M. wolcottiana, M. hutsoni and others,—granules length- 
ened in a spiral direction. The whorls are rather strongly convex, 
the last one very wide, and descending rather deeply in front. 
Aperture is very shortly oval, nearly as high as wide, the peristome 
expanded, a little thickened within, the margins connected by a 
strong parietal callus. Height 8.8, diam. 16; diam. umbilicus 2.8 
mm. Aperture 8 mm. high, 9 wide. 
In the U. 8. National Museum there are two examples (one 
much broken) of a Micrarionta (Plate III, fig. 6), No. 187478, label- 
ledas collected at Tinajas Altas by Maj. E. A. Mearns, Feb. 21, 1894. 
They agree so fully with Newcomb’s type of M. rowelli that we 
