410 J. W. Dawson—FPaleozoice Land Snails. 
2. Pupa Bigsbiis.n. (Figs. 5 and 6.) 
Description.—Shell half the size of Pupa vetusta, or between 
three and four pate ae in length and one and five-tenths 
millimeters in breadth. m, long conical. Body whorl about 
one-third of the entire detipatli, giving the shell a somewhat 
bulimoid form. Whorls five in the largest specimens found, 
tumid, suture much impressed. Surface smooth. perture 
apparently oval in form, but not perfectly known, as the body 
se is crushed in all the specimens. 
A few specimens, none of them quite perfect, were found in 
the erect trees of group XV at the Joggins, along with Pupa 
vetusta. They differ from that species in smaller size, different 
form and absence of sculpture. The specimens do not show 
whether the aperture was toothed or simple, but it was proba- 
bly the latter, as the lip is evidently very thin and delicate. 
From its form it is probable that it belongs to a different sub- 
genus from P. vetusta. It is very much more rare than that 
species in the erect trees, and has not been found elsewhere. 
I dedicate it to my venerable and dear friend Dr. Bigsby, 
F.R.S., of London, a pioneer in American geology, and still an 
indefatigable worker in the science. 
3. Pupa Vermilionensis Bradley. (Figs. 8 and 9, and 14¢.) 
[Bradley in Report of eh ae Survey of Illinois, vol. iv, p. 254. Id. in Am. 
Journ. Sci., III, vol. iv, p. 87.] 
Description.*—Shell spindle-shaped, tapering to an obtuse 
apex, covered with microscopic ridges (25 to 30 in a millime- 
ter) parallel to the lines of growth. Aperture oblique, oval. 
Outer lip thin, slightly reflexed. Columella lip reflexed, thick- 
ened ; furnished with a single central curved tooth, projecting 
nearly half way across the aperture. Junction of columella 
and outer lip somewhat angular and dentiform. In old indi- 
viduals the columella tooth is often continuous through an 
entire turn or farther. It is not seen on shells having less than 
three turns. The last turn forms nearly half the length of the 
shell. Whorls rounded. Suture impressed. Surface glossy. 
Color black or gray. Length three and six-tenths millimeters. 
Width two millimeters. Some individuals are smooth or desti- 
tute of the fine microscopic ridges, but whether this is a natural 
SiR BS or a result of injury to the outer surface, is not cer- 
* Slightly modified from Bradley. 
