176 BULLETIN OF THE 
P. strigosa Cooperi, torm elevata, Ckll. Delta Co. 
P. strigosa Cooperi, form major, nov. Shell with diam. 25 mm. Near head 
of North Mam Creek, Mesa Co., Sept. 14, 1887. 
P. strigosa Cooperi, var. minor, Ckll. Near Egeria, Routt Co., abundant. It 
is quite a distinct local race. 
Pristiloma, Ancer. 
Animal as in Patula. 
Shell small, imperforate, horn-color, shining, many whorled ; spire de- 
pressed conic; aperture sometimes armed with radiating, rather crowded, 
palatal lamelle. 
Northern and Arctic North America, 
Types: Zonites Stearnsi and Lansingi, BLAND. 
Formerly Pristina, Ancey, and Anceyia, PILSBRY, preoc. 
Jaw low, wide, slightly arcuate, ends little attenuated, blunt, with numer- 
ous crowded broad ribs, denticulating either margin. 
Lingual membrane with tricuspid centrals, bicuspid laterals, aculeate mar- 
ginals, as in Zonvtes. 
Separated from Microphysa by the ribbed jaw combined with the lingual 
membrane of Zonites: a very unusual occurrence. 
Pristina Lansingi, BLAND. 
Plate III. Fig. 6. 
I give a better figure of this species. 
Pristiloma Stearnsi, Brann. 
Vol. V., figures in text. Suppl., Plate I. Figs. N (dentition) and O (jaw). 
Shell minute, imperforate, globose conic, striate, shining, horn-colored ; 
suture impressed ; whorls 7, regularly increasing, the last not descending, very 
globose, swollen below, excavated closely around the imperforate umbilical 
region; aperture rounded; peristome simple, acute. Greater diameter 4 mm., 
y that 1 
lesser 34 ; height 2} mm. 
Zonites Stearnsi, Brand, Ann. N. Y. Lyc., XI. 74, Figs. 1, 2 (1875). 
Microphysa Stearnsi, W. G. Binney, Terr. Moll. V., figs. in text; Suppl., Plate II. 
Figs. N (dentition) and O (jaw). 
Astoria, Portland, Oregon ; Olympia, Washington; Alaska. A species of 
the Oregonian region. 
It is larger, more elevated, and more distinctly striated than Lansingi, with 
wider, more rounded, unarmed aperture. 
