MUSEUM OF COMPARATIVE ZOOLOGY. 39 
termination almost entirely concealing the small umbilicus. Greater diam- 
eter, 19 mm.; lesser, 15 mm.; height, 11 mm. ; 
Var. Magor. Six full whorls, umbilicus less concealed. Greater diameter, 
22mm. (Fig. 3.) 
Helix ptychophora, A. D. Brown. See Vol. V. p. 855. 
Arionta Townsendiana, var., W. G. Binn. 1. c. Suppl., Pl. IV. Figs. E, F. — 
Man. Amer. Land Shells, p. 128, Figs. 101, 102. 
Deer Lodge Valley, Montana: the large variety was found by Mr. Hemphill 
along Salmon River, Idaho: Bitter Root Mountains, Umatilla Co., Oregon : 
Weston, Oregon, to the Dalles. The range westwardly through the Cascades 
has been already explained above (see p. 28). 
Formerly I was disposed to believe this to be a ase of Arionta Town- 
sendiana, but the larger number of specimens received from various localities 
has convinced me of its being distinct. It is a true Mesodon, very much like 
M., clausus. It is a smaller shell than Zownsendiana, more globose, less widely 
umbilicated, with more circular aperture; the sculpturing lacks the transverse 
strie and malleations of the Arionte. 
For genitalia, jaw, and lingual dentition, see Terr. Moll., V. 
To my knowledge, Arionta Townsendiana has not been found east of the 
Cascade Mountains. 
Mesodon Columbianus, Lea. 
Plate I. Fig. 5. 
A species of the Pacific Province as well as the Central Province. Also re- 
ceived from Ceur d’Aléne Mountains, Idaho: Deer Lodge Valley, Montana. 
(H. Hemphill.) 
One Coeur d’Aléne Mountain specimen with parietal tooth is figured. 
The form found at these Central Province localities is the variety called labi- 
osa by Gould. It is more globose than the type, has a more circular aperture, 
without the horizontal basal margin or toothlike thickening to the peristome. 
The latter is extremely broad, grooved, not flattened. It must be remembered 
that this toothed form is not the armigerus, Ancey, which will be treated under 
the Pacific Province species. 
Vallonia pulchella, Mitt. 
A universally distributed species. Also at various points in Utah (Hemphill). 
Pupa muscorum, Lin. 
Plate IIL. Fig. 11. 
Universally distributed. 
The shell figured, which appears to me identical with this species, was sent 
to me by Mr. Ancey as P. sublubrica, from White Pine, Nevada. 
