1923} NATURAL SCIENCES OF PHILADELPHIA 69 
chestnut-brown band with very indistinct pale borders, somewhat 
glossy, with fine, weak growth lines, and below the suture on the 
last whorl a group of incised spiral lines (weak on some specimens, 
but probably always present). Whorls increase rather slowly, 
the last slowly descending in front. The peristome is very slightly 
expanded. 
Height 11, diam. 17.3, umbilicus 2.5 mm.; 43 whorls. Type. 
S i 7-5 mms Station 49, 
cc 9, a3 15 cc (73 (79 
Soft anatomy unknown. 
S. clappi in the Santa Ritas has some resemblance to this 
species, but the last whorl is wider and the surface granulose. It 
appears distinct from known species of other ranges by the size, 
small umbilicus and especially the sculpture. Numerous dead 
specimens, part of them in good condition, were taken at Station 49. 
Until specimens can be dissected the position of this species in 
the genus cannot be determined. 
Sonorella sabinoensis tucsonica n. subsp. 
Tucson Range, the commonest species, generally distributed. 
Stations 63, 64, 66, 74, 75, 77, 80-83 in one valley, ‘wild pig 
amphitheatre’; 72, 73, 79 are the small form from the northwest 
end of the range. Also at Stations 54, 56, 57. 
The shell is similar to S. sabinoensis except that the umbilicus is 
a little larger in specimens of equal size; as in that species, the last 
whorl, seen from above, is quite wide. It differs from S. papa- 
gorum by the sculpture of the embryonic whorls, which is distinct, 
as in sabinoensis, while in papagorum it is extremely weak, the 
surface appearing more polished. The color is distinctly darker 
than papagorum, wood-brown or almost fawn color, with a usually 
broad chestnut-brown band with pale borders. The last whorl 
descends very little in front. 
Height 15.7, diam. 27. mm., 4% whorls. Type. Station 81. 
cf 15 roiinoA,<s - @ Station 57. 
(a3 123 “cc 20.5 (73 (73 e ce 64. 
The genitalia are similar to S. sabinoensis, characterized by a 
rather long penis, in those measured from slightly over 4 to nearly 
3 the diameter of shell. The slender, slightly tapering penis- 
papilla is also long, generally wrinkled somewhat, but in one speci- 
men (Station 64) it was smooth. The flagellum is small, or in a 
specimen from Station 57, wanting. The penis and vagina are 
longer than in S. papagorum, but of the same type. Measurements 
follow: 
