1910.] NATURAL SCIENCES OF PHILADELPHIA. 123 



Twenty taken at random measure : 



Two lamellae: axial and parietal — 

 Length 10, diam. 3 mm. ; whorls 12. 



Goodwin's Canyon, near Lawhorn's ranch, not far south of Nine-mile 

 Water Hole, is the locality of a small series taken by Mort Wien (pi. XII, 

 fig. 3). They are decidedly wider than Fort Bowie cionella, and have 

 either two or three lamellae in the few examples opened. It is apparent- 

 ly a subordinate race of cionella. The largest and smallest measure: 



Length 11, diam. 3.5 mm.; whorls 12*. 

 10, " 3.5 " " 11*. 



Some specimens of similarly wide shape, but with only the axial 

 lamella, in a few opened, were taken by Mort Wien "a half mile from 

 Dos Cabezas Cave." 

 Holospira cionella intermedia n. subsp. PI. XIII, figs. 1-14. 



The head and southern slope of White Tail Canyon are inhabited 

 by a race closely related to C. cionella, but remarkably polymorphic. 

 The internal lamella? vary from one to three, but in most colonies 

 there are one or two, the former number predominating. The sculpture 



