GASTEROPODA OF THE LOWER GREEN MARLS. 121 
DOLITD A. 
Genus DOLIUM Lamarck. 
Doxtium (DOLIOPSIS ?) MULTILIRATUM, Nn. sp. 
Plate xv, Figs. 4-6. 
Shell, as known from an internal cast, small, subglobose or broadly 
pyriform; outer volution forming nearly the entire bulk of the shell; spire 
low, rounded, the whole composed of about three whorls; sutures in the 
cast quite strongly marked; beak of the last volution short and on the 
hack, scarcely distinct from the marginal lip, showing the existence of only 
a very short canal; aperture large, fully five-sixths as long as the entire 
length of the shell; columella showing only a moderate cavity by its re- 
moval, but giving evidence of a projecting part near the lower end on the 
inside; otherwise the cast shows no twist of the columella; surface of the 
cast marked by numerous spiral lines and furrows (about sixteen ridges can 
be counted along the margin of the lip), and also by irregular transverse 
wrinkles, parallel to the margin of the aperture; near the aperture, on the 
last volution, a sharp constriction indicating a strong varix, as if for the 
thickening of the outer lip, over which the spiral lines pass, and there is 
a line of small pits, one on each rib, indicating node-like granules. 
The cast presents every appearance of a species of Doliwn, as tar as a 
‘ast would preserve the features of a shell of that genus. The canal, of 
course, would not show the twisting or tortuous character on a cast, unless 
the matrix of that part was preserved, which is not the case in the present 
instance. It may be that it should be referred to Conrad’s genus Doliopsis, 
but his figure would lead me to consider it much more nearly a true Doli 
if there is any difference of generic importance between them. As I do 
not find that Conrad even characterizes the genus, I can not tell what its 
features may be except from his figure on Plate x, Fig. 15, vol. 1, Am. 
Jour., Conch. ; not having seen his types, I was at first inclined to consider 
this shell as congenerie with Meek’s genus Pseudobuccinum, but on remoy- 
ing the inner whorls of the cast I find there is a solid axis, indicating the 
existence of a true columella, although rather slender, which feature Mr. 
