GASTEROPODA OF THE LOWER GREEN MARLS. 49 
tion. ‘To this, in the present specimen, is added an unequal increase in 
growth from an accident during life, and some slight compression from the 
condition of its imbedding, the compression coming in a dorso-ventral 
direction. I have given three figures of this specimen on PI. ty, Figs. 1-3, 
for the purpose of correction. 
Mr. Meek" has emended Mr. Conrad’s generie description, as follows: 
“Shell with body volution a little compressed dorso-ventrally; columella 
flattened; spire about one-fifth the length of the aperture and canal;” citing 
the same species as the type. Mr. Meek undoubtedly took his ideas of the 
shell from Mr. Conrad’s description and a very imperfect figure of the back 
of the shell only. Of this I feel certain, for the reason that the type, which 
is the property of the Am. Mus. Nat. Hist., New York City, coming to them 
through Prof. Holmes, of Charleston, South Carolina, was at that time 
packed away in New York, and not opened until some years afterward by 
myself. Here he has increased the confusion by regarding the slight indi- 
vidual imperfection and accidental compression as the principal and impor- 
tant generic feature. Mr. Conrad? adds still further to the confusion by 
citing from the Paleontologia Indica, vol. 2, as belonging to this genus fig- 
ures and species which are quite distinet from it: This also Mr. Meek points 
out. Mr. Meek* in the earlier lines of his extended description of the genus, 
states that the spire is “not papillate at the apex.” The specimen is 
slightly imperfect at the apex, but it shows plainly that it was papillate 
at the apex when perfect, although but slightly so. Again, speaking of the 
aperture, he says, “being angular, but not notched or canaliculate above,” 
which the specimen certainly is, and quite distinctly so. Still, notwith- 
standing these features, Mr. Meek’s genus Neptunella, with which he was 
comparing it, is quite a distinct form. Mr. Conrad’s genus may be char- 
acterized as follows: 
Shell turbinate or pyriform; spire short; canal and beak short, slightly 
bent in the lower part; columella smooth, thickened, slightly callous in 
the upper part; aperture large, channeled above and narrowly contracted 
‘Invert. Pal., vol. 9, U.S. Geol. Surv. Terr., pp. 343-044.} 
*Am. Jour. Conch., vol. 4, p. 248. 
’U. S. Geol. Surv, Terr,, vol. 9, Invert Pal., p. 343, 
MON XVIII——4 
