48 University of Michigan 
reflected edge of the central is particularly elongate, and the 
mesocone is also slender and lanceolate. ‘The first lateral is 
turned slightly inward and the entocone has moved up on the 
outside of the mesocone. Both of these characters increase 
in prominence through the series of laterals, until in the elev- 
enth tooth the entocone is very small and is high up on the 
outside of the mesocone. This tooth is shaped very much 
like what may be termed the first marginal, only the latter is 
bicuspid. The first 18 marginals are bicuspid, and arranged 
in an almost horizontal row. The individual teeth (No. 21 is 
typical) are not so obliquely placed as are the tricuspids of 
G. gundlachi, or those of this species. T he thirtieth tooth shows 
a minute, additional cusp outside of the others, and is the first 
of 19 tricuspids. With these, the transverse row begins to 
curve obliquely backward. These tricuspid teeth are even 
larger and better developed than are the bicuspids. ‘With the 
reduction in size of the outermost teeth comes an additional 
cusp on the forty-ninth, which is the first of 8 or 9 quadricus- 
pids of rapidly reducing size. The two outer denticles, which 
are often absent (even in adjacent rows in the body of the 
radula this much variation was noticed), are practically 
cuspless. 
Euconulus (?) pittieri (von Martens) (1892).—One dead 
specimen from humus among rocks, near the Laguna de 
Catemaco. This specimen agrees very well with the original 
description. It differs from £. elegantultPby the marked cari- 
nation of the whorls, the more conical shape, the greater prom- 
inence of its radial wrinkles, which extend to within one whorl 
of the apex and which, in regularity and prominence, are some- 
what reminiscent of Strobilops, and the coincident relative 
obscurity of the spiral striations, which, however, are quite 
noticeable on the lower side. It differs from G. gundlachi 
