Crustacea. | LOWER PALZOZOIC ARTICULATA. 155 
Creraurus Witiramst (M'Coy). Pl. 1. F. fig. 13. 
Ref.—M°Coy, Ann. Nat. Hist. 2nd Series, Vol. IV. 
Sp. Ch.—Cephalic shield semielliptical, length rather more than half the width; glabel/a semicylindrical, 
gibbous, rounded in front, with nearly parallel sides, three nearly equidistant, curved, segmental furrows 
on each side, the basal pair nearly confluent at their ends with the neck-furrow, enclosing a tumid ovate 
space on each side, separated by an undivided space about one-fourth of the width of the glabella; thorax 
twice the length of the glabella, axal segments large, two-thirds the width of the pleuree, each of which 
has a very large, oblong tubercle at its margin, diagonally cleft by the pleural sulcus, and followed at 
one-third from axis by a hemispherical tubercle, about half its diameter distant from the first, beyond 
which the distal two-thirds of each pleura is falciformly dilated into a thin, flat, fin-like appendage, the 
anterior margin of which is very convex, posterior margin slightly concave, extremity pointed; pygidium 
small, the six marginal spines small, all extending about the same distance backwards, the anterior pair 
therefore longest; they are thick, triangular, and three or four times wider than the others. Length of 
entire animal one inch four lines, of glabella five lines, width about nine lines. 
The disconnected, broadly faleate, paddle-shaped pleurse help to distinguish this beautiful little species, 
which by its narrow elongate form resembles a Remopleurides. 
Position and Locality—One entire specimen, collected from the schists of Golu Goed, Myddfai, by 
Mr Williams, of Llandovery, and presented to Professor Sedgwick by him. 
Explanation of Figures—PI. 1. F. fig. 18. Entire animal, natural size—Fig. 13 a. Profile of ditto— 
Fig. 134. Two pleure and portion of axis magnified. 
Genus. ECCOPTOCHILE (Hamle and Corda). 
Syn. < Chirurus (Beyrich) and? Cryphaus pars Green. 
Gen. Char—Cephalic shield rounded, glabella semicylindrical, convex, extending as far as the front 
margin, with three short segmental furrows on each side, the lower pair curving inwards and downwards ; 
cheeks moderately convex, rugose, lateral angles extended into short spines; eye-line cutting the lateral 
margins, considerably in front of the angles; (eyes small, facetted jid. Corda) ; thorax of twelve joints, axis 
convex, smooth, pleuree much wider than the axis, ending in thick deflected contracted points ; pleural 
groove straight, nearly mesial, and parallel with the margins, pitted, ceasing at the thickened base of 
the terminal spine; pygidium of four joints, those of the axis simple, the terminal one subtrigonal ; 
lateral ribs three on each side, two first pair with a pleural pitted groove, all six ending each in a broad 
ovate terminal expansion. 
EccoprocHILE SEDGWICKI (Ad/Coy). Pl. 1. F. fig. 14. 
Ref. and Syn.—Crypheus Sedgwicki, MeCoy, Ann. Nat. Hist. 2nd Series, Vol. IV. p. 406. 
Sp. Ch.—Cephalic shield subsemicircular ; glahella slightly clavate, smooth, three segmental furrows on 
each side, the posterior pair longest, turning backwards and inwards nearly to the neck-furrow, enclosing 
a triangular space on each side longer than wide, the width rather less than that of the undivided portion 
of the glabella between their bases, the two anterior pair of furrows shorter; cheeks broad, gently convex, 
closely and coarsely pitted; meck-segment thick, smooth; eye-line extending with a slight curve to the 
margin in front of the angles; azal lobe very convex, narrow, slightly tapering, nearly parallel-sided, smooth, 
of twelve segments, three similar belong to the pygidium, a fourth terminal one being obtusely trigonal; 
the side lobes are flattened, and more than double the width of the axal lobe; plewrw nearly straight, 
narrow, and for the greater part of their length flattened, and having a broad, nearly mesial, pleural sulcus, 
deeply punctured like the cheeks, dividing each into two parts, the posterior largest and forming a thick, 
smooth, rounded ridge, in the distal third of its length bent down and a little backwards, swelling to a 
thick narrow ridge in the middle, the sides and the extremity expanding into a broad, thin, foliaceous 
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