Dr. H. Woodward—Eurypterus in the Coal-Mvasures. 279 
Swedish specimens have lately been obtained in so perfect a 
state of preservation that they have been mounted on glass by 
Professor E. J. G. Holm, and a series so prepared are preserved in 
the Natural History Museum, Cromwell Road.’ 
Evryprervs Moyseyi,? H. Woodw., sp. nov. (Pl. XIII, Figs. 1, 2.) 
Figs. 1 and 2 on our Plate XIII are drawn, slightly enlarged in 
each case, from one of the sides of two irregularly-shaped clay- 
ironstone nodules, which have been split open; Fig. 1 displaying also 
upon its inner surface, not only the Arthropod about to be described, 
but also the pimnule of a Neuropterid fern, attesting the near presence 
of land-conditions, as seen also on pl. iv, fig. 3, pl. vi, and pl. vii, fig. 2, 
of Professor Hall’s figures of Eurypterids from the Carboniferous beds 
of Pennsylvania already referred to. 
Our Fig. 1 shows clearly the semicircular fronted head-shield, with 
its truncated posterior border followed by seven rather narrow but 
transversely broad and arching post-cephalic segments. The head- 
shield carries the eyes, which are prominent and placed anteriorly 
and subcentrally on its upper surface; they are smooth (not facetted) 
and of the usual reniform outline. A raised semicircular ridge seems 
to unite them in front, but this is probably due to the squeezing 
upwards of the bases of two of the anterior pairs ‘of endognaths ; 
a detached portion of one of the palpi (ev.) is seen on the left side of 
the head-shield, and two others on the right side. 
Owing to the circumstance that the posterior portion of the cephalic 
shield has adhered to the counterpart of the nodule, the mouth organs 
on its under-side are more clearly exposed to view, and we see the 
oval metastoma, or post-oral plate (m.), occupying the centre of the 
space, having its attached hinder border rather below the posterior 
margin of the head, while its anterior, slightly notched, free extremity 
reaches to the centre of the head-shield. The broad basal joints of 
a pair of powerful ectognaths (ec., ec.) flank the metastoma on either 
side ; only a part of one of their swimming palps (ee.) is seen lying 
detached on the left side; perhaps the appendage labelled (en. 6) on 
the right side may be the other palpus, the distal spatulate extremity 
being in that case broken off, or concealed by the matrix. Endognath 5 
(en. 5, Fig. 1) is a slender organ having only four of its original seven 
joints visible ; the terminal joint being a simple and sharp spine. 
The narrow median organ, or central appendage, of the opercular 
plate, the extremity of which is rounded, is seen in Fig. 1, op., as 
a well-marked impression underlying the four anterior post-cephalic 
segments. 
As in other species of this genus, the first segment following the 
head-shield is narrower than the rest; the three which follow are 
deeper, and increase gradually also in breadth; then follow three 
more, which become gradually narrower but do not diminish in 
1K. J. G. Holm, ‘‘ Ueber die Organisationen des Lurypterus Fischeri, Eichw.”’ : 
Mém. Acad. Imp. Sci. St. Pétersbourg, Phys.-Math. Cl. (vim), vol. viii, No. 2, 
80 pp., 10 pls., 1898. 
* Named in honour of the discoverer, Dr. L. Moysey, M.A., of St. Moritz, 
Ilkeston Road, Nottingham. 
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