378 PROCEEDINGS OF THE ACADEMY OF [June, 



Station 42 (further north than Station 39). Similar to the above, 

 having the same rude sculpture, but a httle smaller in the average, 

 length 11 to 13 mm. 



Station 41. Shells like PI. XIV, figs. 4-46. 



Holospira campestris n. sp. PI. XV, figs, l, 2. 



The shell is shortly rimate, cylindric, with very short terminal cone 

 and mamillar apex. 2| embryonic whorls smooth (the last half 

 whorl very narrow), following whorls closely and finely striate, the 

 striae of the conical portion narrower, hence appearing more widely 

 spaced than those of the cylindric portion, on which they are as 

 wide as the intervals. On the penultimate whorl there are about 

 70 striae. The last whorl is decidedly compressed below the pe- 

 riphery, tapering downwards, somewhat more coarsely sculptured 

 on the latter part. It is shortly rimate and built forward shortly 

 from the preceding whorl. All of the whorls are very strongly 

 convex. The aperture is angular at the upper outer part, elsewhere 

 rounded. Peristome narrowly expanded. Axis cylindric, in the 

 latter part of the penultimate and first part of the last bearing a 

 stout axial lamella. There is also a long and strong parietal or 

 superior lamella, and sometimes a basal lamella. Length 11.5, 

 •diam. 3.7 mm.; whorls 12. 



Mesa at western foot of the Dragoon Mountains at Station 26, 

 along a "wash" or gulley at the south fence of the Fourr ranch, 

 No. 112,214, A. N. S. P. Also Stations 24, 25, in the same vicinity, 

 etc. 



Other specimens of the type lot (PI. XV, figs. 1 to Id) measure as 

 follows. All but one of the specimens opened have two lamellae, 

 one having three. 



At Station 24, a gulley running out of the Fourr ranch, the shells 

 are 9 to 10 mm. long, otherwise similar. 



At Station 25, foothills west of the Fourr ranch (PI. XV, fig. 2) 

 the shells are smaller, with sculpture like the type. The peristome 

 adheres for a short distance to the preceding whorl, or is very shortly 

 free. The columellar lamella is within the front of the last whorl; 



