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J. M. Clarke—New Phyllopod Crustaceans. ATT 
by Estherie, destined to be quickly buried in the first wind- 
drift of sand on the return of high tide.” We can not prove 
from this | species, HZ. pulex, the presence of fresh-water deposits 
in the Hamilton, but the evidence is fairly in favor of brackish 
water pools, guarded from the action of the waves of the open 
ocean and depositing a smooth muddy bottom. Associated with 
these clannish little fellows are undescribed species of Beyrichia, 
Leperditia, Entomis, with a species of Discina not identified, 
and this association, omitting the Discina, is not an impossible 
one for such a bra ckish water pond. Even the Discina itself 
is not a serious objection to it, as I have found but a single 
example, which may have been washed in either as a dead she l, 
or as a live one, and if the latter, may have soon yielded to its 
unfavorable environment and dis ed, or have adapted itself to 
the change and have lived on in an abnormal condition, as this 
specimen seems to prove. 
Spathiocaris, n. g. (G2a6n=a spathe.) Plate, figs. 1, 2, 3. 
rapace in one piece ) oblong- -elliptical ; dimensions when 
Car. 
normal, length : width :: ‘ nterior and posterior mar- 
ginal curvature of the he ‘value except near the sides of the 
ce 
of dorsal suture except in the fact that when gin Noor eet 
as many specimens are, the line of folding is usually straight 
from apex to anterior margin, but there is no external mark of 
a commissure in the ornamentation lines on the surface.. It 
has for several years been a matter of some doubt to myself, 
whether this fossil should be looked upon as crustacean, which 
I now believe it to be, or some new form of Discinoid brachio- 
pod which it very closely resembles, but my reasons for nt 
ing it the former lie in the fact that while I have in m 
sion thirty specimens, all that have as yet been found and all 
from a layer only a few inches in thickness, they show a great 
variation In size from a length of four to sixty millimeters, a 
fragment of an unusually large individual showing a probable — 
length of even eighty or ninety mil sowie gad is not a fact 
to expect rte the Discinoid brachiopod reover, every 
mt the carapace, 
so that a among them there is’ no evidence of the ventral or 
oodward from the Moffat shales of seaimarsdattet (qan 
Jour. Geol. Soc., vol. xxii), agrees with Spathiocaris in the — 
