1915.] NATURAL SCIENCES OF PHILADELPHIA. 417 



21 mm. 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 \\idely 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 Plates VIII to XV. 



Plate VIII. — Figs. 1-16. — Sonorella dragoonensis. Type. Station 28, Dragoon 



Mountains. No. 10.3,094. 

 Figs. 2-26. — Sonorella apache. Type. Station 9. No. 111,529. 

 Figs. 3-3b.Sonorella ferrissi. Type. Station 38. No. 103,097. 

 Figs. 4:-Ab. — Sonorella bartschi. Type. Station 1, Mule Mountains. No. 



103,09.5. 

 Figs. 5-5c. — Sonorella sitiens. Type. Las Gijas. No. 112,158. 

 Figs. 6-66. Sonorella sitiens arida. Type. Cerro Colorado. No. 112,160. 

 Figs. 7-7e. — Sonorella eremita. Type. Mineral Hills. No. 112,159. 

 Figs. 8-86. — Sonorella papagorum. Type. Black Mountain. No. 112,161. 



Plate IX. — Figs. 1-16. — Sonorella santaritana. Type. Station 5. Santa Rita 



Mountains. No. 112,105. 

 Figs. 2-26. — Sonorella santaritana. Station 5. No. 112,107. 

 Fig. 3. — Sonorella santaritana. Albino. Station 5. No. 112,106. 

 Figs. 4-46. — Sonorella ivalkeri. Type. Station 5. No. 112,164. 

 Figs. 5-56. — Sonorella walkeri aguacalientensis. Type. Station 2. No. 



112,162. 

 Figs. 6-66. — Sonorella walkeri aguacalientensis. Station 1. No. 112,166. 

 Figs. 7-76. — Sonorella granulatissima occidentalis. Type. Station 17. No. 



112,165. 

 Figs. 8-Sb.— Sonorella clappi. Type. Station 8. No. 112,163. 



Plate X. — Figs. 1-le. — Sonorella baboquivariensis. Types. Station 25, Babo- 

 quivari Mountains. No. 111,549. 



Figs. 2-26. — Sonorella baboquivariensis. Station 22. No. 111,560. 



Figs. 3-36. — Sonorella baboquivariensis depressa. Types. Station 29. No. 

 111,.559. 



Figs. 4-46. — Sonorella tumamocensis. Type. No. 112,245. 



Figs. 5-56. — Sonorella vespertina. Type. Station 24. No. 111,554. 



Figs. 6-66. — Sonorella ashmuni ambigua. Type. No. 112,2.54. 



Figs. 1 -lb. —Sonorella ashmuni capax. Tj^pe. No. 112,253. 



Plate XI.— Fig. I.— Sonorella bartschi n. sp. Genitalia. No. 103,095, A. N. S. P. 

 Fig. la. — Penis-papilla of same. 

 Figs. 16, Ic. — -Jaws of two topotypes. No. 103,095. 



Fig. 2. — Sonorella bartschi, variety. Genitalia. Near Warren, Arizona. 

 Fig. 2a. — Peni.s-papilla of same. 

 Fig. 26. — 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. 



27 



