1923] NATURAL SCIENCES OF PHILADELPHIA 79 
Specimens from Station 126 are a peculiar form in which the 
caliber of the whorls is somewhat reduced and the aperture is less 
oval, nearly round. The lip margins converge more than in 
ambigua, and are united by a callus in old individuals. Umbilicus 
rather large, contained 6 times in the diameter. Embryonic shell 
as in S. ambigua. The peristome is well expanded and somewhat 
thickened within. Height 12, diam. 21 mm.; 44 whorls. 
Genitalia (Plate. VI, fig. 6) as in some specimens of S. ambigua, 
the penis-papilla smooth. Measurements are given on p. 78. 
The animal, in alcohol, is light brownish vinaceous, duskier on the 
back, as in S. ambiqua. 
Sonorella sitiens Pils. & Ferr. Plate VI, figs. 7, 9. 
Proc. A. N.S. Phila. 1915,p. 407. 
This species, originally described from Las Gijas, further north 
and west, was found everywhere in Pina Blanca canyon, Pajaritos 
Range. This canyon is above Oro Blanco, and heads over the border 
in Mexico. Stations 223, 224, 225, 229, 230, 236, 240, 242 (1919). 
Also in Clark’s mine canyon, Station 237. 
Three specimens from Stations 224 and 229 were dissected. 
They have the essential features of the Gija range type,—a very 
short, thick cylindric penial papilla and no flagellum; but in these 
examples the papilla is not corrugated, probably a condition of 
preservation. It is apparently less contracted, being the fraction 
of a millimeter longer. In a specimen from Clark’s mine canyon it 
is 2mm. long. The organs of 3 specimens measure in length as 
follows: 
Mivcepmt Noo ei ell sik bee wd 3 43740 43734 43723 
Beneeh ob oenign te olla... 4.5 6 5 mm. 
i CCE OMG RE Ne, UA ae Seen fk 1.4 Dave 
ai dake cel ce a a Chee 
‘ oR TICES ee (Ge oe 4 5 Gt 
EE | ult LNT ORE Re FR ON See 224 229 237 
DELO i) ROB MGS CMe eo 9 — 7 
Specimens of the shell from Station 237 measure: Height 10.7, 
diam. 18.5 mm.; height 13, diam. 20.7 mm. 
Sonorella sitiens montezuma Pils. & Ferr. Plate II, fig., 8; pl. VI, fig. 10. 
Sonorella montezuma P. &. F., Nautilus, vol. 33, July 1919, p. 20. 
Huachuca range in Montezuma canyon and the pass into Copper 
canyon, often abundant, Stations 312-315, 320, 321, 323-325, 
327, all of 1919. Type no. 130583 from Station 327. 
