_Eupomatus intereans_ sp. nov.
This species is separated from _E. uncinatus_ (Philippi) with some
hesitation since specimens of the latter are not at hand for direct
comparison. It would seem, however, to be clearly different, to judge
from Ehler's figure, in the form of the uncini. These are much broader
(i.e., at right angles to the dental line), the base projecting
conspicuously but not forming an angulate shoulder as in _E. gracilis_,
being nearly evenly and rather broadly rounded. The teeth are mostly
seven in number, the end below the last of these set off as usual,
rounded. The upper collar setæ coarse, with two teeth or spurs at
base of the slender tip, these commonly more or less unequal in size.
Branchiæ thirteen pairs. Operculum in general as in _uncinatus_; width
of principal expansion 1.25 mm.; the latter even, by narrowing into the
stalk, the rim with thirty-eight projecting acute teeth or serrations
which are straight or very nearly so, not at all uncate as in uncinatus
in which they are also fewer (thirty). Inner crown of eleven spines
each tapered evenly to an acute tip and bent in abruptly toward the
center above, the proximal portion being erect and ordinarily parallel
with the others. No process or series of processes detected within
this crown, the base from which these arise being evenly concave on
its distal surface and convex on the proximal. Spines of the inner
crown dark brown proximally as is the entire basal plate from which
they arise, the remaining part of spines light brown. Operculum proper
nearly black below teeth on proximal surface of the expansion and on
adjacent part of stalk the remaining part of which is white; distal
surface of funnel pale. Branchiæ and body in general pale, unmarked or
some of the branchiæ with a blackish mark on stalk toward distal end.
Thoracic setigerous somites seven. Abdominal segments, ninety.
Type--M. C. Z. 2, 178.
Length exclusive of branchiæ, 20 mm.; to end of operculum, about 24 mm.
Width, 1.5 mm.