120 PROCEEDINGS OF THE ACADEMY OF [Feb., 



behind the lip, preceded by an opaque white, very coarsely striate, 

 inflation; base opaque white, projecting more than in the type; callus 

 within the outer lip is very heavy. Color dull corneous brown, like 

 the type. 



Head of Big Emigrant Canyon, in the region of pifion pine groves. 

 Type No. 99,701 A. N. S. P. from Station 1; also taken at several 

 stations eastward in the same neighborhood. 



The head of Big Emigrant Canyon is cut into numerous small 

 ravines, the northern slopes of which are wooded with pinons. The 

 rock is limestone. Here Holospira was found in large numbers. In 

 the type lot 25 specimens, taken wholly at random from a series of 

 some hundreds, were opened and measured. 



Three lamellae: superior, axial and basal (16%) — 

 Length 13 . 5, diam. 4 mm. ; whorls 13*. 

 " 13, " 3.9 " " m. 



12.3, " 3.9 " " 12*. 



u 12j a 4 a u 12 l 



Two lamellae: superior and axial (24%) — 

 Length 13.4, diam. 3.9 mm.; whorls 13*. 



One lamella: axial (60%) — 



Length 15.1, diam. 3.9 mm.; whorls 16. 



