1910.] NATURAL SCIENCES OF PHILADELPHIA. 63 
about 44 whorls, the last with some spiral lines on the upper surface, 
sometimes very faint. 
From the west side of Big Emigrant Mountain (pl. I, figs. 11, 12, 
18, 19) a lot of 32 living adults was taken, of almost equally small 
size (No. 94,320). 
Were In! TAM. .c......+:<: eA Ooms 20) O75) G5 1D 18s 7 18:3 
INoror shells...:.2.:......! 2 2 Ae 6 ii as | it 
The degree of elevation is somewhat variable. In one specimen 
(pl. I, fig. 19) the dark band is wanting. This is the only case of 
the kind among our Chiricahua Sonorellas. 
Another lot of 35 living adult shells from another place on Big 
Emigrant Mountain average larger. 
Waa. tH MM: -...66sscn: eae. eo wae Sole vAP O20) sO 8 1:9 
Moe OF ShHElIS....0./05...0:.2.- ies be ik Sed Cao! 1 
Station 6, high in the valley north of Cross J Mountain, 42 adult 
shells, most of them ‘dead,’ measure: 
Diam. in mm........ 22.8 22.5 22.3 22 21.8 21.5 21.3 21 20.5 20 
No. of shells.......... 2 3 2 6 3 4 a LOE 4 5 
Most shells show spiral lines, as in those from Big Emigrant Moun- 
tain. The specimens were taken in the area indicated in the sketch 
on p. 87, but similar dead shells were seen throughout the valley, on 
both sides of the ravine. The rock of this valley is limestone. 
Eastward from this valley (Station 6) a rugged ridge of coarse 
crumbling granitic rock runs towards the mouth of the canyon (see 
map). Five dead shells found on the outer side of the crest of this 
ridge are like those from the valley, but smaller, diam. 18.5 to 20.5 
mm. 
Station 5. Among rocks at and near the north side of the summit 
of Cross J Mountain. The rock here is angular, friable and cherty. 
The shells, 29 adults, mostly ‘‘dead,’’ resemble the larger colony from 
Big Emigrant Mountain, most of them showing fine spiral lines. The 
elevation is estimated at 8,000 feet. See sketch on p. 87. 
ram. 1 WM. 22404.) 23 228 29 2 22 2S 2 
BlOw Of SMClIS)....... 03s. lsc esese 2 1 1 5 4 ; 1 
Piet: MMs. cad. bench. Tk? 208 20.5 20:2. 20 19.8 
Ol SHEIIS:. «2.05200. cet 5 1 4 1 1 3 
Small form of S. optata (pl.1, fig. 17). Some very small specimens 
were taken near the head of Big Emigrant Canyon south of Station 1, 
