lis GASTROCOPTA. 



lamella and the very deeply immersed lower-palatal fold 

 remain as in G. ashmimi. 



Arizona : Huaehuca and Mustang Mountains, Type 162445 

 A. N. S. P., coll. by J. H. Ferriss. 



Gastrocopta ashmuni imperfecta P. & F,, Proe. A. N. S. 

 Phila. vol. 75, 1923, pp. 62, 63. 



Gastrocopta pilsbryana amissidens, new subsp. PI. 24, 

 figs. 5, 6. 



The shell is like the typical form except that there is no 

 basal fold. Sometimes the upper-palatal fold also is wanting. 

 Type 161437 A. N. S. P., from the San Francisco Mountains, 

 Arizona, collected by J. H. Ferriss. It also occurs at Mahan 

 Mt. near Mormon Lake, about 20 miles south of Flagstaff, 

 Arizona, and eastward at the Betatakin ruins, and in New 

 Mexico at Golden, Santa Fe Co. It is therefore rather widely 

 distributed in northern Arizona and New Mexico. 



Gastrocopta pediculus (Shuttl.). Vol. 24, p. 158. 



Bifidaria bannertonensis C. J. Gabriel, 1930, Proc. Roy. Soc. 

 Victoria, vol. 43, p. 64, pi. 3, figs. 9, 10, appears, from topo- 

 types received from Mr. Gabriel, to be completely identical 

 with G. pediculus ; but his record extends the known range of 

 the species far southward. The original description follows, 

 with photographic copies of the original figures. Plate 21, 

 fig. 13. 



" Shell minute, white, dextral, attenuate, narrowly umbili- 

 cate. Apex obtuse. Whorls 5, convex, ornamented by 

 numerous impressed growth-striae. Sutures deeply impressed. 

 Aperture roundly oblong, armed with five white teeth; one 

 situated about center of parietal wall, comparatively large and 

 unequally bifid; three placed within the basal and outer 

 margin, the center of which is most prominent; the fifth on 

 the columella. Peristome expanded ; the columellar expansion 

 partly concealing the narrow umbilicus. Size of type : length 

 2.6, breadth 1.3 mm." {Gabriel). 



Bamierton [Victoria, Australia] {A. C. Nilson). 



