146 Proceedings of the Royal Physical Society 
segments overlap each other from in front backwards, affording a firm hinge 
so that the tail may fit accurately against the edges of the two anterior 
sclerites. 
Locality—The exact locality is not given, but the attached labels denote 
that the specimen is from the South Staffordshire Coalfield. 
Horizon.—Coal Measures. 
Type Specimen.—Geological Collection, Royal Scottish Museum. 
CRUSTACEA. 
Division SYNCARIDA, Packard. 
Sub-Order ANASPIDACEA, Calman. 
Genus Paleocaris, Meek and Worthen, 1868. 
Palezocaris sp. [Pl. IV. Fig. 9.] 
Among the Crustacean remains preserved in the ironstone nodules of the 
Gubbins Collection are those of a form which belongs to the group Anaspidacea 
of Calman, but which is not in a fit condition for accurate description. It 
consists of a form with a short anterior segment followed by seven distinct 
dorsal sclerites representing the free trunk or thoracic segments, and these 
again in turn by six abdominal segments, and ending in a tail fan composed 
of a short telson flanked on each side by the uropods of the sixth tail 
segment. 
The first dorsal sclerite which, though it does not extend backwards over 
the seven free trunk segments, is the homologue of the carapace in the 
macrurous decapods. It is of the conventional heart shape, with the pointed 
end turned forwards. There is a distinct rostrum, flanked at its base by 
hollows suggesting that they had accommodated stalked eyes. The carapace 
is divided into three distinct areas by deep sulci, which begin near the 
thickened lateral margins about half-way from front to back and pass 
inwards and backwards in a curved line to the posterior margin, dividing 
that line into three nearly equal parts. The central area is much the 
largest and is strongly embossed. No appendages have been preserved in 
relation to this part of the specimen. 
The seven trunk or thoracic segments are nearly equal in size, and are 
divided into a central dorsal part and side lobes or pleura by lines continued 
backwards from the sulci on the first sclerite or carapace. Remains of five 
well-jointed robust limbs are seen to emerge from beneath the pleura of 
the left side of four of the more anterior free trunk segments, and from the 
last of the trunk segments. From their nature these must represent endo- 
podites. A many-jointed lash, which must represent an exopodite of a 
