418 PROCEEDINGS OF THE ACADEMY OF [June, 



Fig. 5a. — Penis-papilla of the same. 



Fig. 56. — Median transverse section of the penis-papilla. 

 Fig. 5c. — Upper end of the penis-papilla opened to show the conic nipple 

 in the apex of the cavity. 



Plate XII. — Figs. 1, la. — Sonorella walkeri. Genitalia and detail of penis-papilla, 



epiphallus and flagellum. Station 8, Santa Rita Mountains. 

 Fig. 2. — Sonorella walkeri. Genitaha. Station 5, Walnut Canyon, Santa 



Rita Mountains. 

 Fig. 3. — Sonorella ivalkeri. Genitalia. Station 5. 

 Figs. 4, 4a. — Sonorella clappi var. Genitalia and detail of penis-papilla, 



epiphallus and flagellum. Station 17, Santa Rita Mountains. 

 Figs. 5, 5a. — Sonorella walkeri. Genitalia and detail of penis-papilla, 



epiphallus and flagellum. Station 15. 

 Fig. 6. — Sonorella clappi. Genitalia. Station S. 

 Fig. 7. — Sonorella clappi. Genitalia. Station 12. 



Plate XIII. — Fig. 1. — Sonorella baboqidvariensis. Genitalia and detail of 

 penis-papilla. Station 25, Baboquivari Mountains. 



P'igs. 2, 10. — Sonorella eremita. Genitalia of two individuals of the tvpe 

 lot, No. 103,100. 



Fig. 3. — Sonorella sitiens. Genitalia and detail of penis-papilla, and epi- 

 phallus of a topotype. No. 103,102. 



Fig. 4. — Soronella papagorum. Genitalia and detail of penis-papilla. No. 

 103,099. 



Fig. 5. — Sonorella tumamocensis. Genitalia and detail of penis-papilla. 



Figs. 6, 6a. — Sonorella eremita. Jaws of two individuals. 



Fig. 7. — Sonorella sitiens. Jaw of type. No. 103,102. 



Fig. 8. — Sonorella tumatnocensis. Jaw of types. No. 103,101. 



Fig. 9. — Sonorella respertina. Terminal ducts of genitalia with detail of 

 end of the penis-papilla. Cotype. 



Fig. 10. — Sonorella eremita. Terminal ducts of genitalia. No. 103,100. 



Plate XIV. — Figs. 1-16. — Holospira danielsi. Type and paratvpes. Tweed 



Canyon, Station 2. No. 112,199. 

 Figs. 2~2c.—H. danielsi. Station 39. No. 112,198. 

 Figs. 3, 3a.— H. danielsi. Station 18. No. 112,195. 

 Figs. 4-46. — H. danielsi, variety. Station 12. No. 112,196. 

 Figs. 5, 5a.— H. danielsi, variety (?) Station 40. No. 103,092. 

 Fig. 6. — Holospira campestris cochisei. Station 21. No. 112,218. 

 Figs. 7-7/. — Holospira campestris cochisei. Cotypes. Station 16. Figs. 



7d, 7e opened to show the internal lamellae. No. 112,219. 

 Figs. S-86. — Holospira campestris cochisei. Station 27. No. 112,220. 



Plate XV. — Figs. 1-lrf. — Holospira campestris. Type and paratvpes. Station 



26, Dragoon Mountains. No. 112,214. 

 Fig. 2. — H. campestris. Station 25, Dragoon Mountains. No. 112,215. 

 Figs. 3-36. — Holospira millestriata. Type and paratypes. Station 7, 



Dragoon Mountains. No. 112,225. 

 Figs. 4, 4a. — Holospira millestriata. Station 36, Dragoon Mountains. 



No. 112,227. 

 Figs. 5-5r. — Holospira millestriata. Station 37, Dragoon Mountains. No. 



122,235. 

 Figs. 6-66. — Holospira ferris.si fossor. Tvpe (fig. 66) and paratypes, near 



Warren, Arizona. No. 112,238. 

 Fig. 7. — Holospira ferrissi sanctcecrucis. Type. Santa Cruz R., Tucson, 



Arizona. No. 112,239. 

 Figs. 8-8e. — Holospira arizonensis mularis. Type and paratypes. Near 



Bisbee, Arizona. No. 112,236. 



