79 
Class, scaphopoda Bronn 
Genus, Plagloglypta Pilsbry and Sharp 
Plagioglypta canna (White) 
1877. DentaMum canna White, U.S. Geog. Surv., W. 100th Mer., vol. 4, 
p. 156, Pl. 12, figs. 6 a, b. 
Remarks. This is doubtless identical with White’s species. It agrees 
in size, angle of divergence, and surface markings — in every respect except 
curvature. White says 1 that the shell is straight or very slightly curved. 
None of the Minnewanka specimens show curvature. Girty, who has 
examined White’s types, says that the type specimens are seemingly straight 
so that he is inclined to believe that White was mistaken in this respect.* 
Exceedingly faint longitudinal striae are undoubtedly present, and 
there may similarly be markings due to a longitudinally fibrous structure 
of the shell. These striae, are, however, too weak to throw the species into 
the genus Dentalium. 
This species and Euphemus carbonarius arenarius n. var. occur to- 
gether in very great abundance in a white quartzite bed. 
Locality and Horizon . Permian of New Mexico and Arizona, and 
of Guadaloupe mountains (Delaware Mountain formation), Texas. In 
the Minnewanka region in the Permian of sections 1-10 (C); 3-3 (c). 
ClaSS, GASTROPODA 
Genus, Euphemus McCoy 
Euphemus carbonarius arenarius var. nov. 
Plate VII, figure 13 
Description. Dorsum broadly rounded when mature, more narrowly 
rounded in immature specimens. Umbilicus closed, at least in the majority 
of specimens; it may be slightly open in a few forms. A thin callus is 
deposited upon the inner lip. Outer lip thin medially, thickened laterally. 
Slit band scarcely visible, sometimes slightly concave, with a faint ridge 
on either side upon the smooth part of the shell. (In a shell 20 mm. wide 
the ridges are distant from the middle of the depression 2 mm.) Surface, 
except for the final half of the last whorl which is smooth, ornamented in a 
shell of medium size with 18 low revolving costae. Lines of growth obsolete. 
The transverse and longitudinal diameters of a specimen of medium size 
are each 26 mm. 
Remarks . This variety differs from the species as described and 
figured by Meek, 8 principally in its greater size. A Nebraska specimen of 
medium size had transverse and longitudinal diameters of 14 mm., with 
18 to 25 costae. Cox’s type specimen of E . carbonarius as figured and 
described by White, 4 has longitudinal and transverse diameters each of 
17 mm., with 20 to 28 costae. 
i Loo.cit. 
* U.S. Geol. Surv., Prof. Paper 58, p. 450. 
* U.S. Geol. Surv., Nebraska, Final Kept., p.224, PI. 4, fig. 16, PI. 11, figs.lla-c. 
* 13th Kept. Geol. Surv., Indiana, p. 158, PI. 33, figs. 6-8. 
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