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IV .—On some new Crustaceans from the Lower Carboniferous Rocks of Eskdale 
and Liddesdale. By B. N. Peacu, A.R.S.M., F.G.S., of the Geological 
Survey of Scotland. Communicated by Professor Gerxiz, F.R.S. (Plates 
VII. to X.) 
(Read 19th July 1880.) 
By the permission of Professor A. C. Ramsay, LL.D., F.R.S., Director- 
General of the Geological Survey of Great Britain and Ireland, and Professor 
GrikiE, LL.D., F.R.S., Director of the Geological Survey of Scotland, I have 
been permitted to describe several new Crustaceans which have come under 
my notice in my capacity of Acting Paleeontologist to the Scotch Survey. 
They are from the-cement-stone group of the Calciferous Sandstone series 
of the Scottish border, and, with a very few exceptions, were got from one 
locality on the river Esk, about four miles south of Langholm, in Dum- 
friesshire, and were almost all collected by A. Macconocutz, Fossil Collector to 
the Geological Survey of Scotland. They belong to two orders, viz., Phyllo- 
poda and Decapoda. 
I. Phyllopoda. 
The Phyllopods as yet found in the Calciferous Sandstone series have been 
confined to the genera Dithyrocaris, Leaia, and Estheria. Some large cara- 
paces, attributable to Ceratiocaris, have however been obtained from the 
Carboniferous Limestone, but as far as I. have been able to make out, no 
body-segments have been described. In the collection above referred to a 
great many specimens occur, which appear to belong to two different species. 
When compared with those found in the Upper Silurian Rocks they differ 
considerably in having the body relatively much larger than the carapace. The 
abdomen appears to be out of all proportion to the carapace if we take such 
well-known forms as C. papilio (Salter), or C. stygius (Salter), as our ideals. 
The tests are not ornamented by the same fine striations as these latter. 
Ceratiocaris scorpiotdes, spec. nov. (Pl. VII. figs. 1 to 17). Carapace about 
one-third the length of the body exclusive of telson, subovate in form, and pro- 
duced into a blunt snout anteriorly, and posteriorly into a rounded lobe, which 
extends backwards beyond the median line of the posterior margin. The 
anterior, ventral, and posterior margins are slightly thickened. The dorsal line 
is almost straight, with a slight droop anteriorly. Jaws two in number, and 
placed within the carapace near its anterior ventral margin. They are hollow 
and denticulated, the toothed portion being much thickened. Body long and 
VOL. XXX. PART I. M 
