1905.] NATURAL SCIENCES OF PHILADELPHIA. 265 
lation is finer and less distinct than in typical granulatissima, and the 
umbilicus is slightly wider. The supraperipheral band is wide, and has 
no paler borders. There are 43 whorls, the last rather deeply defiexed. 
The embryonic shell is sculptured as in S. hachaitana. 
Alt. 12: 12 12.4 1 12 
Diam. 23:6 23 22.6 22 22 
Alt. apert. 1 10.5 10.8 9.8 10 
Width apert. 17 122 12 11.4 12 
Width umbilicus ee) ee 2.6 ou 3 
Alt. ula ier H2 1% 12.2 mm. 
Diam. 22 21.9 Zee 20 
Alt. apert. 10.7 10 9.8 oan" 
Width apert. 11.9 15 11.2 10.9." 
Huachuca Mountains, in Brown’s Canyon. Types No. 87,083, 
A.N.S. P., collected by James H. Ferriss. 
The soft anatomy is unknown, but the form, while not conspicuously 
differentiated, is yet readily distinguishable from S. granulatissima. 
Specimens sent to Mr. Bartsch were pronounced by him to “stand 
half way between S. dalli and S. granulatissima.” 
Sonorella dalli Bartsch. 
Smiths. Misc. Coll., Vol. 47, p. 193, Pl. 21, fig. 1 (October 10, 1904). 
This form is somewhat larger and more depressed than S. g. latior. 
It is described as with “numerous microscopic granulations,’”’ but in 
one of the type lot kindly presented by Dr. Dall these are hardly appre- 
ciable. The type measurements are alt. 12, diam. 26.5, aperture 
10.5 x 11.8 mm.; and Mr. Bartsch has kindly supplied the diameters 
of the rest of the scries in the U. S. National Museum, as follows: Type 
lot, Tanner’s Canyon, Huachuca Mountains, 26.5, 26.1, 25.9, 24.1, 24, 
the last two not quite mature. Huachuca Mountains, 25.3 mm. Fort 
Huachuca, 24.6 mm. 
The smallest mature specimen of S. dalli slightly exceeds the largest 
latior by 1 mm., and the smallest adult latior measures the same as the 
largest granulatissima. S. mearnsi Bartsch, from the San José Moun- 
tains, 4 miles south of the Arizona boundary, measures 16 mm. diam., 
being 1.5 mm. smaller than the smallest adult granulatissima. It is 
quite conceivable that S. dalli and S. mearnsi are merely the extremes 
of dimensions in a continuous series of variations in size. Since S. 
granulatissima is the only form of the series known anatomically, the 
ultimate status of the others remains in abeyance. Some or all of 
them may prove to have valid anatomical specific characters. 
