Dr. H. Woodward — Carboniferous Arthropods. 467 



The longitudinal furi'owsof the axis serve to maintain the trilohed 

 character of the whole body. The thoraceti'on consists of six nearly 

 equal, coalesced segnaents (the ridge and farrow of each are marked 

 on the central lobe) curving backwards to the margin, and bordered 

 by a stout ridge, which in each segment terminates in a prominent 

 marginal spine (of which there are seven, the seventh forming 

 a part of the rudimentary abdomen); the spines are united to each 

 other by a flat naTrow-scalloped border of the shield. The extremity 

 of the axis, composed of two or more coalesced segments and together 

 with the telsou or caudal spine (wanting in this specimen), form the 

 rudimentary abdomen : (the telson or tail-spine being absent can only 

 be vaguely estimated from other specimens). There are indications 

 of tubercles along the axial lobe, the base of the largest of which is 

 seen near the termination of the axis over the articulation for the 

 telson. 





Fig 

 Figs. 3 and 4.- 



X li. 



Two detached head-shields of Euproops AmicB, H. Woodvv., 

 showing long post-cephalic spines from the genal border of the head-shield. 

 From Caledonia Pit, No. 4 : Glace Bay Mines, Cape Breton (H. M. Ami, 

 1907). 



Compared with the type of Euproops {E. Bance, Meek & Worthen) 

 the head-shield of E. Amia is deeper from back to front, the free- 

 cheek spines are more laterally divergent and more hollowed out 

 upon their inner posterior border ; the axis is broader than in the 

 type, in which the margin of the glabella is somewhat narrower 

 and the eyes are said to be more anteriorly placed ; in E. Amice 

 the posterior border of the glabella, which is rounded, terminates in 

 a pair of slender spines three times as long as those of the type 

 i^E. Dance). The thoracetron in E. Amice is roundly cordiform, and 

 the scalloped marginal border is more definitely separated from it. 

 [As Dr. Meek's specimen is mainly known by his admirable restoration 

 a strict comparison with less perfect materials leaves some points 

 rather doubtful.] 



I dedicate this species to its discoverer, my friend Dr. Henry M. 

 Ami, who has devoted many years to the study of Acadian geology. 



