Dr. H. Woodward—On a Carboniferous Eurypterus. 419 
VII.—Norr on Huryprervs FROM THE CARBONIFEROUS. 
By Henry Woopwarp, LL.D., F.R.S., V.P.G.S., 
of the British Museum (Natural History). 
N the Grotogrcan Magazine for November last (Decade III. 
Vol. IV. p. 481, Pl. XIII.) I gave a brief description of a new 
species of Hurypterus from the Lower Carboniferous Shales, Eskdale, 
Scotland, which I named Eurypterus scabrosus. 
I referred to other Carboniferous forms, and briefly mentioned one 
from the Lower productive Coal-measures, Darlington, Pennsylvania, 
U.S.A., figured as a woodcut only in the American Phil. Soc. Proc. 
vol. xix. p. 152, 1881. 
I was not aware at that time that my friend Professor James Hall, 
of Albany, had printed a “ Note on the Lurypteride of the Devonian 
and Carboniferous Formations of Pennsylvania.” [Extracted from 
Report of Progress PPP, Second Geological Survey of Pennsylvania. 
Svo. with six plates, Harrisburg, 1884; printed in advance. | 
Having, through the kindness of the author, been favoured with a 
copy of this memoir, I hasten to remedy the omission in my paper 
referred to above, and to state that Professor James Hall has fully 
described and figured this Coal-Measure Eurypterus from Darlington 
under the name of H. Mansfieldi. Both in the form of its appendages 
and its size EH. scabrosus is quite distinct from Hall’s £. Mansfieldi, the 
latter being not more than nine inches in length, whereas the former 
measured, when perfect, probably not less than 20 inches. JH. 
scabrosus was, moreover, furnished with long and slender bluntly- 
spinose appendages, but in EH. Mansfieldi the palpi terminated in 
sharp recurved spines, closely resembling the earlier U. Silurian 
forms both in its palpi and swimming-feet. 
Prof. James Hall devotes 24 figures to the illustration of this 
species ; he also figures and describes three others (H. potens, E. stylus, 
and E. Pennsylvanicus) from the same locality and formation as HE. 
Mansfieldi. EE. stylus is a much smaller form, only about half the 
length of the former. E. Pennsylvanicus is only known by a detached 
carapace, and H. potens by some detached portions. Professor James 
Hall also adds an important note on Eurypterus (Anthraconectes) 
Mazonensis, Meek and Worthen, from the Coal-measures of Grundy 
Co., Illinois (see Amer. Journ. Sci. vol. 46, p. 21, 1868: also 
Geol. Surv. of Illinois, vol. iii. (Geology and Paleontology), 1868, 
p- 544, woodcut figure). This, as Hall very correctly points out, is 
no doubt a true Hurypterus, and the slight differences pointed out by 
Messrs. Meek and Worthen do not seem to justify the placing it in 
a distinct genus. 
Prof. Hall figures a second specimen from Mazon Creek, which 
he believes to be the actual counterpart of Meek and Worthen’s 
specimen, and points out how closely it agrees in many respects with 
HE. Mansfieldi, the differences being really only of specific value. 
The same author also figures and describes a very complete but 
headless body of a Eurypterus from the Chemung group (Upper 
Devonian) of Warren, Pennsylvania (plate iii. p. 80, op. cit.), which 
