262 PROCEEDINGS OF THE ACADEMY OF {[Mch., 
under my scalpel, gives reason for considering its modification in this 
species of importance. 
I have identified these shells with S. rowelli (Newe.), a species said 
to have been collected in Arizona by Frick, many years ago. SS. arizo- 
nensis (Dall), from Tucson, is more elevated, but is probably related 
to rowelli. 
A form collected by Dr. G. H. Horn, the coleopterist, at Fort Grant, 
Arizona, is closely related to the shells described above. 
In the Patagonia Mountains, a short distance castward from the 
locality of S. rowelli, a smaller form of the species was collected by Mr. 
Ferriss (Pl. XVIII, fig. 35), and also by Mr. Ashmun. The umbilicus 
is narrower and more covered by the dilated lip than in Sanford’s 
rowelli, and the last whorl descends more deeply in front. ‘The shells 
measure : 
83,268, Ferriss coll. 73,604, Ashmun coll. 
Alt. 9 8 8 8 8 mm. 
Diam. 15.4 14 14 14 1s bo 
Alt. apert. 7.8 6.9 6.8 6.5.5 0) ieee ps 
Diam. apert. 8.5 1.8 dot 1.5, 2 eee 4 
One of Mr. Ferriss’ specimens (fig. 35) was sent alive, and proves to 
be like the Sanford’s rowelli anatomically, differing merely in the 
smaller size of all the organs, except that there is no perceptible flagel- 
lum (Pl. XX, fig. 20, the terminal ducts only are drawn). The jaw 
(Pl. XXIII, fig. 18) has about 6 narrow equal ribs. 
The type measurements of H. rowelli given by Newcomb are alt. .4, 
diam. maj. .6, min. .5 inch., about equal to 10,15, 12.5mm. The type 
is in the collection of Cornell University. 
‘Sonorella granulatissima Pils. Pl. X VU, figs. 21-23. 
Nautilus, XVI, p. 32, 1902. 
Bartsch, Smiths. Misc. Coll., Vol. 47, p. 193, Pl. 32, fig. 4. 
The shell in the co-types of this species is thin, pale, with a rather wide 
dark chestnut band without white borders, and visible above the suture 
on the last 24 or 3 whorls. The surface is very minutely and very 
densely granulated over the usual low growth-wrinkles. Near the 
periphery some faint traces of spiral lines may be deciphered in places, 
but they are so slight that they would have been overlooked if not espe- 
cially looked for. The umbilicus is small. The two co-types measure ° 
5 These measurements differ slightly from those given in the original descrip- 
tion, due to the fact that at that time I used sew! a flat millimeter rule, upon 
which it is, I find, impossible to read correctly the dimensions of globose shells. 
