346 PROCEEDINGS OF THE ACADEMY OF [May, 



Alt. 1.1, diam. 2.7 mm. (type, fig. 5A). 

 '' 1.2, " 2.6 " (fig: 5B). 



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. cydopherella has far finer 

 striation. V. gracilicosta has closer riblets and a much smaller 

 umbilicus. V. alhula 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 Imrely crosses the inter- 

 national Ijoundary. 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. 



II. The Florida Mountains. 



The Florida range (accent on the /) is about twelve miles long, 

 with a maximum elevation slightlj' exceeding 7,000 ft. It runs from 

 north to south. A partially detached but adjacent continuation 

 northward is knowai 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 

 yuccas. The mountains are arid and rather iDarren, of limestone in 

 the middle towards the top, granitic southward and porphyritic 

 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 



