346 PROCEEDINGS OF THE ACADEMY OF [May, 
Alt. 1.1, diam. 2.7 mm. (type, fig. 5A). 
De me ieee ys apie idee 35) od) 
Summit of Big Hachet Mountain, Station 11. Type No. 112,012, 
A. N.S. P., collected by Pilsbry, August 25, 1910. 
This species is abundant at Station 11, in the dirt under stones. 
It is more closely related to V. perspectiva Sterki than to any other, 
but it is a very much larger shell. V. cyclopherella has far finer 
striation. V. gracilicosta has closer riblets and a much smaller 
umbilicus. V. albula has a smaller umbilicus. 
Having collected and identified some thousands of the Vallonias 
of Arizona and New Mexico in the last ten years, it was a surprise 
to find a species which differs conspicuously from the three mountain 
species mentioned above. As we have not found V. sonorana. else- 
where in our work in southern New Mexico and Arizona, it seems 
likely that it is a southern species which barely crosses the inter- 
national boundary. As a rule, Vallonias are rather widely, dis- 
tributed snails. 
The Holarctic genus Vallonia now comprises about 25 recent and 
pleistocene and a half dozen tertiary species, besides about a dozen 
named varieties. It is likely that some of these are mere synonyms. 
We have nine recent species in the United States, all of them readily 
recognizable, except V. excentrica, which is often hard to tell from 
pulchella. 
Vallonia perspectiva Sterki. 
Station 11, a few specimens taken with the preceding species. 
Il. THe Frormpa Mountains. 
The Florida range (accent on the 7) is about twelve miles long, 
with a maximum elevation slightly exceeding 7,000 ft. It runs from 
north to south. A partially detached but adjacent continuation 
northward is known as the ‘Little Floridas.”” As in neighboring 
ranges, there is a long ascent or mesa before reaching the base of 
the mountains proper (5,000 ft.), characterized by a zone of tree 
yuceas. The mountains are arid and rather barren, of limestone in 
the middle towards the top, granitic southward and _ porphyritie 
northward. Vegetation scrubby. We noted as common two small 
species of oak, hackberry, sotol, cylindropuntia, a broad-leaved 
agave, etc. Barrel cactus (bisnaga) was seen at the foot. 
In November, 1906, Mr. Ferris and the author drove out from 
Deming 18 miles to Mr. Priser’s cabin, where there is a small spring, in 
