418 PROCEEDINGS OF THE ACADEMY OF [June, 
Fig. 5a.—Penis-papilla of the same. 
Fig. 5b.—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. 
Puate XII.—Figs. 1, la.—Sonorella walkeri. Genitalia and detail of penis-papilla, 
epiphallus and flagellum. Station 8, Santa Rita Mountains. 
Fig. 2.—Sonorella walkeri. Genitalia. Station 5, Walnut Canyon, Santa 
Rita Mountains. 
Fig. 3.—Sonorella walkeri. 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 walkert. Genitalia and detail of penis-papilla, 
epiphallus and flagellum. Station 15. 
Fig. 6.—Sonorella clappi. Genitalia. Station 8. 
Fig. 7—Sonorella clappi. Genitalia. Station 12. 
Puate XIII.—Fig. 1.—Sonorella baboquivariensis. Genitalia’ and detail of 
penis-papilla. Station 25, Baboquivari Mountains. 
Figs. 2, 10.—Sonorella eremita. Genitalia of two individuals of the type 
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 twmamocensis. Jaw of types. No. 103,101. 
Fig. 9.—Sonorella vespertina. Terminal ducts of genitalia with detail of 
end of the penis-papilla. Cotype. 
Fig. 10.—Sonorella eremita. Terminal ducts of genitalia. No. 103,100. 
Puate XIV.—Figs. 1-1b.—Holospira danielsi. Type and paratypes. 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. 4-4b.—H. danielsi, variety. Station 12. No. 112,196. 
Figs. 5, 5a.—H. danielsi, variety (?) Station 40. No. 103,092. 
Fig. 6.—Holospira campestris cochiset. Station 21. No. 112,218. 
Figs. 7-7f—Holospira campestris cochisei. Cotypes. Station 16. Figs. 
7d, 7e opened to show the internal lamella. No. 112,219. 
Figs. 8-8b.—Holospira campestris cochisei. Station 27. No. 112,220. 
Puate XV.—Figs. 1-1d.—Holospira campestris. Type and paratypes. Station 
26, Dragoon Mountains. No. 112,214. 
Fig. 2.—H. campestris. Station 25, Dragoon Mountains. No. 112,215. 
Figs. 3-3b.—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—5c.—Holospira millestriata. Station 37, Dragoon Mountains. No. 
122,235. 
Figs. 6-6b.—Holospira ferrissi fossor. Type (fig. 6b) and paratypes, near 
Warren, Arizona. No. 112,238. 
Fig. 7.—Holospira ferrissi sanctecrucis. Type. Santa Cruz R., Tucson, 
Arizona. No. 112,239. 
Figs. 8-8e.—Holospira arizonensis mularis. Type and paratypes. Near 
Bisbee, Arizona. No. 112,236. 
