GASTEROPODA OF THE LOWER GREEN MARLS. 87 
species, probably belonging to different subgenera of the Volutide. If we 
are to take the specimen represented by Mr. Gabb’s outline figure,' as the 
type, then the strongly lyrated shells found in the Lower Marls at Holmdel 
and Freehold, New Jersey, would belong to this species. In this form the 
body volution is symmetri sally curved without angulation at the upper part, 
or flattening on the median surface, and the aperture conforms on its mar- 
gin to the form of the volution, and in the lower part gradually and sym- 
metrically approaches the columella. This form I think is typical of the 
species. But there are at least two others which it is difficult to separate 
from this one. One of these has a differently formed spire, with flattened 
volutions and more distinctly marked sutures, the last volution showing 
a decided flattening in the median portion; the aperture is effuse and 
spreading below, strongly reminding one of the aperture of the living 
V. angulata Swainson. <A third form which I find associated with these 
is shorter, thicker, and shouldered above, having the largest part of the 
volution at its upper margin. It also occurs only at the base of the 
Upper Marl Bed. I will, however, here restrict the species to that first 
described and consider the others under distinct names. Mr. Gabb in 
redescribing’ V. nasuta says that he has seen specimens with five or six 
folds on the columella, although it normally has but three. I am inclined 
to think that here he has confounded more than one species, as I have 
not been able to find specimens having more than four true folds, although 
sometimes the spiral ridges of the exterior may have left their imprint 
on this part of the shell. 
In comparing this form with 2. Texana Con., it seems to me there is 
very little if any difference, and I am much inclined to consider them as 
the same species, but in the absence of any good specimen of that species 
I hesitate to pronounce positively between them. 
Formation and locality: In the Lower Marls at Freehold, Marlborough, 
Holmdel, and Crosswicks, New Jersey. Mr. Gabb also cites it from Patula 
Creek, Alabama. 
‘Jour. Acad. Nat. Sci., Phila., vol. 4, Pl. xivuu, Fig. 9. 
2Proc, Acad, Nat. Sci., Phila., 1876, p. 294. 
