262 PALEONTOLOGY OF THE EUREKA DISTRICT. 
described from them, namely: Pupa vetusta, P. Bigsbyi Dawson, Zonites 
(Conulus) priscus Carpenter, from the Coal Measures of the South Joggins, 
Nova Scotia; Pupa Vermillionensis, Dawsonella Meeki Bradley, from the 
Upper Coal Measures of Vermillion River, Illinois, and Strophites grandeva 
Dawson, from the Devonian plant beds of St. John, New Brunswick (Amer. 
Journ. Sci., 3d ser., vol. xx, p. 403, 1880). Subsequently Prof. R. P. Whit- 
field gave the results of his study of Dawsonella Meeki, showing that it was 
probably an operculate shell, and he also described. Anthraco-pupa Ohioensis 
from the higher beds of the Coal Measures at Marietta, Ohio ([bid., xxi, 
p- 125, .881). All of the species are true land shells, the aquatic division 
of the Pulmonifera being unrepresented up to the time of the discovery in 
Nevada of the species to be described. The geologic horizon at which the 
latter occur is intermediate in position to the Devonian plant beds of New 
Brunswick and the localities in the Coal Measures of Nova Scotia, Illinois, 
and Ohio. . 
A brief notice of these shells was published in Science, vol. ii, p. 808, 
1883. . 
Genus PHYSA Draparnaud. 
Physa prisca Walcott. 
Physa prisca Walcott, 1883. Science, vol. ii, p. 808, fig. 2. 
Shell small, oblong, sinistrally spiral, and with about four volutions, 
the last one expanded, ventricose, with the short, small spire 
above less than one-fourth its length; aperture more than three- 
fourths of the length of the body volution, broadly rounded 
anteriorly, becoming more pointed at the opposite end; outer 
lip thin, inner lip slightly reflected on the last whorl. 
Surface smooth or marked by fine lines of growth. ; 
The shell is apparently that of a true Physa, although wofehaly 3. 
thicker than in most species of the genus. It may belong to a subgeneric 
group, but of this we have little evidence in the specimens before us. 
The largest specimen has a length of 9", and the smallest of 4™™. 
Formation and localities—Lower portion of the Carboniferous Group, 
in a chocolate-colored limestone, on the western slope of New York and 
Richmond Mountains, Eureka District, Nevada. 
