288 



PROCEEDINGS OF THE ACADEMY OF [NoV-DeC. 



del Oro and some other places the general hue is cinnamon or cin- 

 namon-buff, opaque, and the size small, diam. 18 to 20 mm. The 

 smallest adult seen measures 17 mm. in diameter. 



Specimens from the Rincons, Station 22 (1917), are pale cinnamon 

 or greenish above, fading to a pale, bluish-gray on the base, the 

 band with narrow, indistinct paler borders or without them. The 

 lip is conspicuously brown-edged. The umbilicus is generally 

 wider than in the Catalina shells. One perfect shell and another 

 broken one in this lot are albinos, or at least the tint is very pale, 

 and there is no band. These shells are found deep in a rock slide in 

 a quaking asp thicket. At Station 20 (1917), on the northern slope 

 of the Rincons, two dead but fresh shells were found in a day's search. 



Sonorella odorata marmoris n. subsp. PI. III., figs. G to Cb. 



The shell is more solid than S. odorata, opaque; cinnamon, paler 

 around the umbilicus and on both sides of the chestnut-brown band. 

 Last whorl is decidedly more depressed than in S. odorata, and is 

 narrower as viewed from above. The umbilicus is wider. The 

 aperture is much smaller. 



Alt. 10.4, diam. 20 mm.; 4| whorls (type). 



9, 



18 



4i 



Fig. 2. Genitalia of S. o. marmoris, No. 109,079, with detail of penis-papilla. 



Santa Catalina Mountains: Marble Peak, on the east side above 

 the rock slide; old Dan's Gulch on the northwest side, type loc; 

 ridge running toward Mt. Lemon; Ferriss 1911 and 1913. Type No. 

 109,075 A. N. S. P.; paratypes 109,075a, also in Ferriss collection. 



Genitalia (fig. 2) in general similar to S. odorata but the penis and 

 papilla are decidedly longer and there is a flagellum, well developed 

 for a Sonorella. Measurements of the organs are given in the table 

 on page 287. 



