GASTEROPODA OF THE LOWER GREEN MARLS. 105 
PLEUROTOMID:. 
Genus SURCULA H. & A. Adams. 
SURCULA STRIGOSA. 
Plate x11. Fig. 1. 
Surcula strigosa Gabb: Proc. Acad. Nat. Sci., Phila., 1876, p. 279. 
Shell elongated, turreted, with an elevated spire; the number of volu- 
tions unknown, there being now in existence only a fragment of a speci- 
men, consisting of part of the body volution and the next above; body volu- 
tion proportionally large as compared with the other, concave on the upper 
surface and gently convex on the middle portion, the anterior beak and 
canal being absent; the next volution above the principal one subangular 
at the upper third of its height and marked by ten or twelve strong, rounded, 
vertical folds, and also by moderately strong spiral lines; while the body 
volution has also been marked by the vertical folds, but less strongly than 
the other, but is closely covered by nearly equal, vertical and spiral lines 
cancellating the entire surface; one of the latter, at the lower edge of the 
concave upper surface, and another a short distance below, have been 
stronger, and those on the lower half of the volution are somewhat alter- 
nating in size. | 
In Mr. Gabb’s description of this shell, which I suppose was drawn 
from the same individual here used, he states that there are “perhaps 
eight” volutions, and also says it is 3 inches in length. The specimen 
has probably been mutilated, or has possibly fallen in pieces since the 
description was made. The specimen bears no label except that of locality, 
which is Holmdel, as given by Mr. Gabb. He also states that the speci- 
men was loaned to him by Prof. G. H. Cook for description, and as this is 
the only one found from that locality it is most probably the type. The 
only species having any resemblance to it are those herein described as 
Terricula elegans and T. Leda, neither of which can easily be mistaken for 
it and neither of which would appear to belong to the same genus, and are 
readily distinguished by the absence of the concave upper surface on the 
body volution. 
