122 PROCEEDINGS OF THE ACADEMY OF [Feb., 



At Station 2, at the bottom of the canyon (middle branch), a few- 

 dead specimens sharply, but very finely, striate throughout were found 

 (pi. XI, figs. 9, 10, 11, 12). On the tapering cone and basal whorl 

 the striae are coarser. At the head of this branch a small series (about 

 25) of similar shells Avas found. They are hardly distinguishable 

 from H. cionella. Holospira colonies are scattered profusely all over 

 the head slopes of Big Emigrant Canyon. We doubt whether more 

 than one specific stock is represented there, though when thoroughly 

 worked several minor races might be mapped out. 

 Holospira cionella Pils. PI. XII, figs, l, 2. 

 Proc. A. N. S. Phila., 1908, p. 217. 



The types of this species came from near Old Fort Bowie. The fort 

 stands on the narrow and Ioav neck which unites the Dos Cabezas 

 range with the Chiricahuas proper. Only the adobe walls now stand; 

 only the cemetery remains to be guarded! The ridge has here a 

 minimum elevation of 5,500 feet. About a mile south Mr. Dixon's 

 place lies in the valley east of two conical peaks, known as Bull Hill 

 and Quartzite Peak, the former of cherty limestone formation. Holo- 

 spira cionella is found on the slope of Bull Hill facing the fort, the 

 exact spot being along a tiny gully w T hich crosses the trail to the fort. 

 This place is indicated on the right at (3) in the photograph reproduced 

 on page 67. It probably has an elevation of 6,000 to 6,200 feet. 

 Another colony is on the lower slope of Quartzite Peak, toward Dixon's 

 house, also indicated in the photograph at (2). Specimens from this 

 place agree most closely with the original types of cionella. 



The figured types (pi. XII, figs. 1, 2) are cylindric shells, evenly and 

 rather finely but strongly rib striate, the striae not weaker on the latter 

 whorls ; they are coarser on the swelling behind the contraction preced- 

 ing the lip. Out of 11 shells of the type lot opened, 9 have an axial 

 lamella only; 2 have axial and superior or parietal lamellae. When 

 originally describing this species only a few specimens were opened, 

 and all happened to have one lamella only. The four specimens figured 

 in 1905 measure as follows (the first three may be considered cotypes) : 



Length 12, diam. 3.1 mm. ; whorls 12^. 

 11.3, " 3.25 " " 12. 



11, " 3.25 " " 12. 



8.7, " 3 " " 11. 



Bull Hill (pi. XII, figs. 4-8). Specimens from the locality facing 

 the Fort are all smaller than the types, though a few individuals of 

 the original lot, such as pi. 27, fig. 31, of our former paper, are entirely 

 similar. 



