1915.] NATURAL SCIENCES OF PHILADELPHIA. 417 
21mm. At Station 28, still lower, the range in diameter is from 17 
to 20 mm. At Station 31, much nearer the mouth of the canyon,’ 
the shells are about typical. 
Sonorella baboquivariensis depressa n. subsp. PI. X, figs. 3, 3a, 36. 
The shell is more depressed than typical baboquivariensis with the 
umbilicus decidedly more widely open; aperture smaller. Alt. 
9.8, diam. 17.7 mm. 
Baboquivari Mountains, low in upper Sycamore Canyon, Station 
29. Type No. 111,559, A. N.S. P. 
EXPLANATION OF PuaTes VIII to XV. 
Pirate VIII.—Figs. 1-1b.—Sonorella dragoonensis. Type. Station 28, Dragoon 
Mountains. No. 103,094. 
Figs. 2-2b.—Sonorella apache. Type. Station 9. No. 111,529. 
Figs. 3-3b.—Sonorella ferrissi. Type. Station 38. No. 103,097. 
Figs. 44b.—Sonorella bartschi. Type. Station 1, Mule Mountains. No. 
103,095. 
Figs. 5-5¢e.—Sonorella sitiens. Type. Las Gijas. No. 112,158. ; 
Figs. 6-6b. Sonorella sitiens arida. Type. Cerro Colorado. No. 112,160. 
Figs. 7—7e.—Sonorella eremita. Type. Mineral Hills. No. 112,159. 
Figs. 8-8b.—Sonorella papagorum. -‘Type. Black Mountain. No. 112,161. 
Puate IX.—Figs. 1-1b.—Sonorella santaritana. Type. Station 5. Santa Rita 
Mountains. No. 112,105. 
Figs. 2-2b.—Sonorella santaritana. Station 5. No. 112,107. 
Fig. 3.—Sonorella santaritana. Albino. Station 5. No. 112,106. 
Figs. 4-4b.—Sonorella walkeri. Type. Station 5. No. 112,164. 
Figs. 5-5b.—Sonorella walkeri aguacalientensis. Type. Station 2. No. 
112,162. 
Figs. 6-6b.—Sonorella walkeri aguacalientensis. Station 1. No. 112,166. 
Figs. 7-7b.—Sonorella granulatissima occidentalis. Type. Station17. No. 
112,165. 
Figs. 8-8b.—Sonorella clappt. Type. Station 8. No. 112,163, 
Pirate X.—Figs. 1-le.—Sonorella baboquivariensis. Types. Station 25, Babo- 
quivari Mountains. No. 111,549. 
Figs. 2-2b.—Sonorella baboquivariensis. Station 22. No. 111,560. 
Figs. 3-3b.—Sonorella baboquivariensis depressa. Types. Station 29. No. 
111,559. 
Figs. 4—4b.—Sonorella tumamocensis. Type. No. 112,245. 
Figs. 5-5b.—Sonorella vespertina. Type. Station 24. No. 111,554. 
Figs. 6-6b.—Sonorella ashmuni ambigua. Type. No. 112,254. 
Figs. 7-7b.—Sonorella ashmuni capax. Type. No. 112,253. 
Piatse XI.—Fig. 1.—Sonorella bartschin.sp. Genitalia. No. 103,095, A.N.S. P. 
Fig. la.—Penis-papilla of same. 
Figs. 1b, 1c.—Jaws of two topotypes. No. 103,095. 
Fig. 2.—Sonorella bartschi, variety. Genitalia. Near Warren, Arizona. 
Fig. 2a.—Penis-papilla of same. 
Fig. 2b.—Jaw of same. 
Fig. 3.—Sonorella ferrissi n. sp. Genitalia. 
Fig. 3a.—Penis-papilla of the same. 
Fig. 4.—Sonorella dragoonensis, n. sp. Genitalia. No. 103,093. 
Fig. 4a.—Penis slit open showing the penis-papilla of same. 
Fig. 5.—Sonorella apache n. sp. Genitalia. 
