THE NAUTILUS. 81 



Length 27.8 mm., diam. 11.5 mm.; aperture, length 9.7 mm., 

 width 8.6 mm. 



The clausilium is widest in the middle, tapering towards both 

 ends. It is a little thickened at the distal end, and the main 

 curvature is near the filament. 



Type, Cat. No. 215084 U. S. Nat. Mus., from the Peruvian 

 Andes, in the vicinity of San Miguel (6,000 ft.), Urubamba 

 Valley, Province of Caxamarca, Peru, collected by Dr. O. F. 

 Cook, and referred to the writer by Dr. Wm. H. Dall. 



This species is strongly differentiated from all known Neniae 

 by its very obese figure and small number of whorls, none be- 

 ing deciduous. The sculpture allies it to such forms as N. 

 taczanowskii (Lub. ), which also agrees in the armature of the 

 throat. The inflation of the penult and contraction of the last 

 whorl give the shell an appearance of deformity. Dr. Paul 

 Ehrmann has remarked of the genus Nenia l that Ecuador and 

 northern Peru are its distribution center; the group here reaches 

 its acme of differentiation, and is most numerous in species. 

 The present species, of a shape hardly to be matched in the 

 whole family Clausiliidas, is a further illustration of the diversity 

 of forms found in this focal region for Nenia. 



MY JOURNEY TO THE BLUE AND WHITE MOUNTAINS, ARIZONA. 



BY JAS. H. FEERISS. 



At the close of a summer in the Catalina mountains, Frank 

 Cole, the guide for tourists and bug hunters to the wilds, led 

 me into the seventh heaven. Something over 200 miles north- 

 east of Tucson, Mt. Thomas, also known as Sierra Blanca and 

 Old Baldy, in this region of perfect delight, stands 13,496 feet 

 above sea level, the highest in Arizona, and at that time un- 

 known to conchology. Here was the chance at that mythical 

 Oreohelix " big as a tea saucer." 



J The late Dr. C. Boettger (1909) and most other recent authors on this 

 group consider Nenia generically distinct from Ctausilia. Its nearest affinity 

 in the old world appears to be the Indo-Chinese genus Garnieria. 



