1905.] NATURAL SCIENCES OF PHILADELPHIA. 219 



Length 12.1, diam. 3.5 mm. 



The type was found in the debris of the Rio Grande at Mesilla, New- 

 Mexico. The specimen described above is from near Kingston, Sierra 

 county, New Mexico, collected by 0. B. Metcalfe, sent by Prof. T. D. A. 

 Cockerell. 



H. cockerelli differs from the related H. regis and H. mearnsi chiefly 

 by the smoothness of the intermediate whorls. It is not improbable 

 that the original specimen found in the flood-debris of the Rio Grande 

 was washed down from the region around Kingston, as Prof. Cockerell 

 suggests to me. 



Holospira chiricahuana "• sp. PI. XXVI, fig. 9 ; PI. XXVII, figs. 2&-29. 



Shell imperforate, shortly rimate, cylindric, the upper half tapering, 

 thin, pale brownish-corneous. Whorls 11 to 12, all convex, the first 

 slightly bulging and wider than the second, both smooth, the following 

 whorls sharply sculptured with close riblets a little narrower than their 

 intervals. The last whorl is compressed laterally, tapering downward, 

 the base prominent and white. It is very shortly straightened and a 

 little contracted in front, not carrying the aperture in front of the ven- 

 tral plane of the shell, though the peristome is very shortly free. The 

 aperture is shortly ovate, nearly round, the peristome very narrowly 

 expanded. 



The axis is moderately large and of nearly equal calibre throughout, 

 and at the end of the penultimate and beginning of the last whorl there 

 is a low, short obtuse lamella below the middle on the axis. 



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



8.5, " 2.9 " " 11. 



" g^ " 2.7 " " 11. 



Cave Creek Canyon, Chiricahua jMountains, southeast Arizona. 

 Also Fort Bowie, at the southeastern termination of the same range. 



H. mearnsi Dall is a larger and smoother species. In H. cockerelli 

 the sculpture is coarse on the early and last whorls only, the middle 

 ones having a polished or at least smoothish surface with quite faint 

 striation only. The spire in H. chiricahuana tapers more gradually 

 than in most other species. 



Some of the specimens from Fort Bowie are larger, length 13, diam. 

 3.25 mm.; whorls 14; and one from Cave Creek Canyon, the type 

 locality, measures length 13.5, diam. 3.2 mm.; whorls 14. The riblets 

 are strong and uniform throughout in all the specimens. 



