1915. 



NATURAL SCIENCES OF PHILADELPHIA. 



397 



Station 2, at the base of bluffs southeast of Station 1 and somewhat 

 higher, afforded a few similar shells (PL IX, figs. 5, 5a, 56). One 

 preserved in spirit differs from S. walkexi by having a decidedly 

 longer penis, penis-papilla and epiphallus. There is no fiagellum, 

 and no penial retractor muscle was found. (Fig. 5.) These differ- 

 ences, if confirmed by further dissections, in our opinion, indicate 

 a distinct species; but to direct attention to it we now rank the 

 race as a subspecies of S. walkeri. The diameter at Station 2 runs 

 from 22.3 to 24 mm. The elevation of this Station is between 

 4,100 and 4,200 feet, according to the topographic map. 



Sorujrella clappi n. sp. PI. IX, f5gs. 8, 8a, 86. 



The shell is umbilicate (umbilicus contained about 8 times in the 

 diameter), thin, depressed, semimatt, cinnamon, the base paler, 

 fading to olive-buff in the middle, and with a chestnut-brown shoulder 

 band having paler borders. Embryonic shell of If whorls, the 

 initial I whorl smooth, the rest densely and evenly reticulate-granu- 

 lous, having an indistinct zigzag pattern in some places, but without 

 the spirally descending threads of the hachitana type. Subsequent 

 whorls are lightly striate and microscopically wrinkle-granose, this 

 sculpture becoming weaker on the base. Whorls 4|, the last descend- 

 ing in front, rounded peripherally. Aperture rounded-oval, the 

 peristome thin, narrowly expanded. 



Alt. 10.3, diam. 19 mm.; umbiUcus 2.4 mm. (tvpe). 

 " 10.3, " 18 ■ " (globose topotype). 

 " 9, " 17.7 " (depressed topotype). 



Genitalia (PI. XII, figs. 6, 7). — Penis slender throughout, with a 

 thick, short basal sheath and a long papilla. Epiphallus and vas 

 deferens slender, the former terminating in a minute fiagellum, the 

 retractor muscle inserted close to its base. Vagina shorter than 

 the penis. Measurements in mm. follow. 



Santa Rita Mountains: Station 8, Madera Canyon, type No. 

 112,163. Also taken at Station 16, Madera Canyon; 6, 12, 13, 14 

 near the head of Agua Caliente Canyon; abundantly at Station 5, 



