128 PALEONTOLOGY OF NEW JERSEY. 
Among the examples which I have seen of this species there is but 
little variation except in size, and not much in thisrespect among the adult 
specimens. It is very readily distinguished from the other naticoid shells 
of New Jersey, except N. abyssina Morton, by its oblique patulose form, and 
from that one by its smaller size and by the flattened space below the suture, 
which is a very distinctive feature as compared with any of the associated 
species. The broad, open umbilical cavity which appears to have been en- 
tirely destitute of callus or thickening of any kind, or even of reflection of 
the columella, and with a somewhat angular margin, will also be a distinctive 
mark. Externally it has some resemblance to Gyrodes Alabamiensis Whitt., 
from the Eocene, but is more oblique and not so elevated; but in the um- 
bilical area it is entirely different. Perfect shells from Texas show the sur- 
face to be marked only by fine concentric lines of growth. G. alveata Con- 
rad? appears to be the same species, and the figure given a very good one. 
Formation and locality: Dr. Morton’s type specimens were from Prairie 
Bluff, Alabama, where it is not uncommon. All the New Jersey specimens 
yet seen are either from Mullica Hill, near Mount Holly, or Crosswicks 
Creek. It also occurs in many vlaces in Alabama, and in a very perfect con- 
dition in Texas. 
GYRODES ALTISPIRA. 
Plate xvi, Figs. 7, 8. 
Lunatia ? altispira Gabb: Proc. Acad. Nat. Sci., Phila., 1861, p. 320; Meek, 
Check List Cret. and Jur. Foss., p. 20. 
Lunatia altispira (Gabb) Meek: Geol. N. J., Newark, 1868, p. 729. 
The internal casts which I have placed under this species are about 
three-fourths of an inch in height, and about half an inch in diameter on the 
body whorl; the form is erect and the spire elevated, with about three and 
a half volutions, the last one forming two-thirds of the entire height, and 
by much the greatest bulk of the shell; summit of the body volution 
squarely truncate or flattened adjacent to the suture, and a little flattened 
below, thus forming a rather distinct angle on the top of the volution; the 
umbilicus is small, but open, and without thickening or callus; base of the 
'Am. Jour. Coneh.. vol. L, p. 265, Pl. xxvuit, Figs. 9, 10. 
2 Jour, Acad. Nat. Sci., Phila., 2d ser., vol. 4, p. 289, Pl. xiv, Fig. 45. 
aes 
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