466 Br. If. Woodward — Carboniferous Arthropods. 



arenacea, Dawson (Text-fig. 1), fragments of plant-remains, and some 

 traces of fish-scales. 



Like the type of the gemis (see supra, p. 465) in JEuproops Amt(e, the 

 head-shield is remarkable by reason of its narrowness from back to 

 front, and the extreme lateral expansion of its cheek-spines, which 

 curve upwards and outwards from the posterior border of the head- 

 shield towards the middle of the cheek before curving downwards ta 

 their slender extremities, forming an arc of about 55 mm. measured 

 around the front border of the shield, and 36 mm. along the chord 

 from the extreme points of the cheek-spines, or more than three 

 times as wide as the head-shield is long. The frontal border is 

 narrow and slightly flattened, and the frontal doublure is less 

 strongly marked. 



Fig. 2.—Eup)-oops Amice, H. Woodw., sp. nov. x Ij. (The telson is- 

 restored. ) Donkin Pit, No. 6. Coal-measures : Glace Bay Mines, Cape 

 Breton, Nova Scotia. 



The posterior border of the head where it unites with the 

 thoracetron is 14 mm. broad, but it widens to 29 mm. (including 

 the genal border). The glabella, which is slightly raised, is 10 mm. 

 wide at the cervical border, but slightly widens across the line of the 

 orbits, which are only obscurely to be determined, and is faintly 

 circumscribed by a roundly protuberant rim, within which the 

 glabella forms into a double arch in front, the two arches uniting 

 in a V-shaped backwardly directed ridge in the central line, behind 

 which are three small median lobes marked off by transverse furrows, 

 the hindmost resting on the cervical furrow and the front one 

 extending up to the V-shaped point of the axial ridge. The basis 

 of the glabella ridges gives rise to two backwardly directed slender 

 spines, each 9 mm. in length (these are broken off in Fig. 2, 

 otherwise the most complete specimen, but are seen in the detached 

 head-shields, Figs. 3 and 4). The thoracetron articulates along its 

 anterior border with the posterior margin of the head-shield, which 

 is roundly elevated and cordiform in outline, being 11 mm. broad 

 anteriorly, 16 mm. across at its widest part, and about 25 mm. to the 

 extremity of its lateral marginal spines. The axial division of the 

 cephalon, 5 irim. in width, is continued down the centre of the thora- 

 cetron, diminishing gradually to about half that width posteriorly. 



