GASTEROPODA OF THE LOWER GREEN MARLS. U7 
BUCCINIDA. 
Genus ERIPACHYA Gabb. 
ERIPACHYA ? PALUDINAFORMIS, N. sp. 
Plate 111, Figs. 16, 17. 
Shell, as recognized by casts only, biturbinate or ovate, almost equally 
conical above and below the point of greatest diameter when looking on the 
back of the shell, the diameter of the largest volution equaling about three- 
fifths of the entire length; apical angle of the spire about 60°; volutions 
round ventricose, with strongly marked sutures in the cast, about four or 
perhaps five when perfect, the last one forming the great bulk of the shell as 
seen in a front view; aperture large, elliptical in form, acute above and nar- 
row below, fully equaling one-half the length of the shell; columella moder- 
ately strong, smooth, slightly bent; surface of the volutions marked by 
slight vertical folds, visible on the cast in some specimens only, others 
appearing perfectly smooth; but where showing they seem to have been 
quite numerous, but confined to the upper part of the volution. Itis prob- 
able there have been spiral lines, but no evidence of them remain. 
I see no reason to doubt the generic identity of these casts with the 
shells to which Mr. Gabb applied the above generic name, although the 
spiral lines are not visible. The shells seem to have been quite thick, judg- 
ing from small portions of the substance remaining on some of the 
casts, and from the space represented between the volutions of the spire, in 
which case the surface striations would scarcely have been presérved if 
they had existed. The lack of evidence of this feature in the casts would 
be no reason for doubting its existence on the shell. The casts are very 
erect in form and much resemble forms of Natica or Paludina, except 
that they show a short rostral beak in front with the prolonged aperture, 
thereby separating them entirely from those genera, or from forms of Amaur- 
opsis, for which they might otherwise be mistaken. The casts also some- 
what resemble those referred to Pyrifusus, and it is possible they should be 
classed as such, but the anterior end appears to have differed by being 
produced to form a more distinct beak. 
