84 B, N. PEACH ON SOME NEW CRUSTACEANS FROM THE 
groove. As well as the central ridge of spines, the rostrum bears two lateral 
serrations. 
Observations.—This small species somewhat resembles A. Htheridgit in shape 
and in being spinose, but the absence of the three central ridges on the carapace 
possessed by that species distinguishes it. It is not likely to be confounded 
with any other described species. 
Locality —River Esk, 4 miles south of Langholm, Dumfriesshire. 
Horizon.—Cement-stone group, Lower Carboniferous. 
Genus, Palewocrangon, Salter, 1861; Uvonectes, Salter, Trans. Royal Soe. 
Edinburgh, vol. xxii. p. 394; Paleocrangon, Salter, 1861, Quart. Journ. 
Geol. Soc. vol. xvii. p. 533. 
Paleocrangon Eskdalensis, nov. spec. (Pl. VITI. figs. 9 to 92). A shrimp-like 
creature, about 13 to 2 inches in length. Carapace one-third of the length of 
the body without the appendages. Seen sideways, it is subquadrate, narrow, 
and blunt in front, and produced into rounded lobes posteriorly, which extend 
beyond the posterior margin on the middle line of the back, and overlap the 
pleure of the first abdominal segment. The only ornament isa slight marginal 
ridge, and the anterior margin is slightly serrated or denticulated. <A fold of 
the test which runs almost parallel with and very near to the anterior margin, 
and which supports two or three denticles, may represent the cervical groove. 
The rostrum is not much larger than one of the denticles on the anterior 
margin. Eyes elongated and pedunculated. The antennules are made up of 
long three or four jointed propodites, upon each of which are placed two equally 
long jointed sete. The antenne are made up of long many-jointed flagellee 
and broad basal scales, the tips of the latter not extending beyond the propo- 
dites of the antennules. Of the other appendages belonging to the cephalo- 
thorax only a doubtful appearance of a maxillipede has been observed, and 
represented in fig. 9c, but its component parts are not traceable. 
The abdomen is cylindrical, and tapers each way from the third segment. 
It is made up of six segments, each slightly modified to suit the region where 
it is placed. The first is a mere narrow ring articulated with the last thoracic 
segment, and has small pleure. The pleure of the second expand into 
rounded saddle-flap like lobes, which overlap those of the segments both in 
front of it as well as behind. At the pivot where this one moves upon the first 
segment, the anterior margins of the pleurz are bent forwards at almost a 
right angle till they touch and overlap the posterior lobe of the carapace, so 
that the pleuree of the first segment are entirely hidden, The third, fourth, 
and fifth segments have pointed pleure directed backwards and overlapping 
their succeeding neighbours. The sixth segment is much longer than any of 
the rest, and forms a conspicuous feature. 
a 
