380 PROCEEDINGS OF THE ACADEMY OF [June, 
Station 21, hillside, eastern slope of second ravine from granitic 
spur, up to about 600 feet above bed of ravine. The shells are 
variable, as would be expected in a lot gathered over a considerable 
area, having 35 to 50 ribs on the penultimate whorl. Out of 11 opened, 
one has 3 lamelle, ten have two, superior and axial. (Pl. XIV, fig. 6.) 
Station 22, in the bed of the same ravine. Shells having about 56 
ribs on penultimate whorl. Eight opened have 3 very strong lamelle. 
Station 23. Between Stations 21 and 2, near top. Like the 
preceding, lamelle 2 or 3. 
Fig. 2.—Sketch to show positions of collecting stations west of the spur in Tweed 
Canyon. Contour interval about 400 ft. The granitic dyke about 50 
yards wide between Stations 17 and 18 separates colonies of H. c. cochisei 
(below) from those of H. danielsi (above). 
Station 27. Rather large, length 11 mm. with 12 whorls and 36 
ribs on the penultimate whorl to 13 mm. long, with 133 whorls and 
28 ribs. (Pl. XIV, figs. 8 to 8b.) This station is in a gulch on the 
south side of Tweed Canyon, the nearest approach to the area of 
H. millestriata. It shows no approach to that species in sculpture, 
which is coarser than in most cochisei. Some of the ribs were hollow 
and are broken down, as in H. danielsi. This condition is also seen 
to a less degree in some specimens of cochiser from the type locality. 
Holospira millestriata n.sp. Pl. XV, figs. 3 to 5c. 
The shell is shortly rimate, tilleul-buff, composed of about 113 
convex whorls, of which the last 5 form the cylindrical, those pre- 
ceding the conical portion. Embryonic 2 whorls smooth, somewhat 
nipple-like, the second whorl becoming very narrow. Succeeding 
