^7 



Carbouiferoua Trilobiles. SO 



(losc.ibed, sliows it to be rather depressed, oval-oblong, Avldest between the 

 eyes, with a comparatively large sub-trigoiial posterior lateral lobe on each 

 side, extending forward to about the middle of the inner margin of each of 

 the small palpebral lobes ; and just before each of these larger lateral lobes 

 there is another faintly defined, very small, oblique one, not extending quite 

 so far forward as the palpebral lobes. The neck segment is comparatively 

 Avide antero-posteriorly, arched upwards nearly or quite as high as the cen- 

 tral part of the glabella, and like the latter, ornamented Avith small granules. 

 Length of pygidium, 0.82 inch ; breadth, 0.83 inch ; height, 0.16 mch." 

 Loctdity (I )u\ geologkwd position. — Monongalia Co., W. Va. Chester series, 

 Lower Carboniferous. 



We liave cxnmiiied several specimens of this specie/from Mo- 

 nongalia Co., West Vii'ginia, now in the possession of Prof. J. 

 J. Stevenson, of New York city. The largest ])ygidiLim in this 

 collection is about the same size as that described above. The 

 axis has 14 rings, and the side lobes KL'liLtJAer flat rU)s, gradually 

 decreasing in size, and ending abruptly on the inner margin of 

 the border, which encircle.- the outer portion of the pygidiutn. 



PHILLIPSIA VINDOBONENSIS, Hartt 



PhilUpsia Vindobonensis. Hartt, 1868, Dawson's Acadian Geology, p. 818 



(3d edition). 

 PhilUpsid Viiidobonerisis. Herrick, 1887, Bull. Sci. Lab. Denison Univ., 



Vol. IL p. 63. 

 The description of the species w^as drawn by Prof. Hartt from an imper- 

 fect pygidium : we give the original : — 



•• r\vgidium semi-elliptical, ver}- convex ; one or two segments appear to 

 l)e wanting from the anterior margin ; but the width of the pygidium in 

 that part must have been greater than its length. Ten or eleven articula- 

 tions are visible on the side lobes and twelve on the axis, which is very 

 prominent and moderate'.}" tapering. The axial rings are depressed, convex, 

 becoming smaller, more crowded, and more indistinct toward the apex. 

 Hibs on side lobes depressed, convex, decreasing in length, breadth, and 

 distinctness fiom before backward, while at the same time they become 

 more and more inclined backward. The six anterior ribs preserved show a 

 distincth" marked groove, originating on the posterior margin at about one- 

 third the length of the ribs from the axis, and running obliquely, increasing 

 in depth to the end of the rib. Smooth border, none, or extremely narrow at 

 anterior angles, but becoming three-fifths the width of the axis near the 

 posterior pait of the pygidium, which is not visible in the only specimen I 

 have examined." 



Geologiml position and locality. — Lower Carboniferous, Windsor, Xova 

 Scotia. (Chester Group ?) 



