than hroad, lunate; peristome simple^ acute, margins remote, eolumellar 

 margin sligliUy refiexed, basal margin subsinuate. Greater diameter 4 mill.) 

 height 2t} millP 



Camp 26 : Baker's Park 25 specimens. 



Camp 26 : Cunningham Gulch, 11,000 feet 6 specimens. 



Camp D : Animas Valley. . . - , 25 specimens. 



North Park {Barber) .- 10 specimens. 



This beautiful little shell, described by Mr. Thomas Bland, from my 

 specimens, as above, was not found by me north of the crests of the sier- 

 ras about Baker's Park, but was not uncommon on their southern slopes, 

 where I first found it clinging to vertical and all but inaccessible 

 cliffs in Cunningham Gulch, at an altitude of over 11,000 feet, exposed 

 to daily snow-storms ; yet these specimens were, if anything, finer than 

 those subsequently found along the Rio Las Animas. Mr. Barber's ex- 

 amples are all dead shells, and are not so large or perfect. They were 

 found at an altitude not exceeding 8,000 feet, but the station is not 

 stated. 



Mr. W, G. Binney, who dissected the animal of this species, which 

 seemed with difficulty to wholly retreat into the shell, communicated 

 the following particulars of its anatomy : 



" Jaw low, wide, slightly arcuate, ends slightly attenuated, whole 

 anterior surface with about 22 broad, flat, slightly-separated ribs, 

 whose ends denticulate either margin. This form of jaw is usual among 

 the Helicinae. It is of the same type as H. Lansingi (Ann. Lye. IST. H. of 

 N. Y., xi, 74, fig. 2). Lingual membrane long and narrow. Teeth about 

 16-1-16. Centrals as usual in the Helicince ; the side-cusps and cut- 

 ting-points are well developed, the base of attachment longer than wide. 

 Laterals of same type, but unsymmetrical, and consequently only 

 bicuspid. The change from laterals to marginals is very gradual, there 

 being no splitting of the inner cutting-point. Marginals low, wide, with 

 one inner, long, blunt cutting-point, and one outer small, blunt cutting- 

 point." 



Helix lineatus, Say. 

 Camp D : Animas Valley ^ specimen. 



Eiio Chama, N. Mex. {Binney and Bland)', Salmon Eiver, Idaho {Hemp- 

 Mil). North America except Pacific coast. 



Helix Folygyrella, Bid. and J. G. Cp. — Common on Coeur d'Alene 

 Mountains {Cooper). 



Helix Columbiana, Lea. — Hell-Gate Valley, Montana (Bemp/w^Z) jFraser 

 Eiver {Lord). Pacific coast. 



Helix devia, Gld. — Intruding into Idaho {Binney) ; Deer Lodge Valley, 

 Montana {Hemphill). Pacific coast. 



Helix loricata, Gld. — Sierra Nevada {Cooper). Pacific coast. 



