FOSSILS OF THE CARBONIFEROUS LIMESTONES. 313 



divided by two deep furrows, proceeding toward the ventral margin 

 form a circular pit nearly in the centre, and diverging at an angle of 

 about GO". Margin very narrow ; outline nearly semi-circular. It is 

 nearly allied to B. Kloedeni of the Devonian. 



PhilUpsia Howi, Billings (Fig. 133), "Canadian Naturalist," 

 vol. viii. p. 209. — This species was described by Mr Billings from 

 specimens found by Prof. How of AYindsor, at Kennetcook, Hants 

 County. It is closely allied to P. meramecensis, Shumard, and P. 

 insignis^ Winchell, from the Lower Carboniferous of the United States, 

 but differs in the greater number of rings in the axis of the pygidium 



Fig. IZl.— Serpnlites Fig. 132. — Beyrichia Joncsii ; Fig. 133. — PMllipsia 



annulatus. nat. size and magmjied. Howi. 



or tail-piece, the only portion known. These Phillipsias of the Carbon- 

 iferous are very interesting as the last representatives of the great 

 family of Trilobites, so abundant in the older Palaeozoic rocks. 



PhilUpsia Viridoboiiensis, Hartt. — Pygidium semi-elliptical, very 

 convex ; one or two segments appear to be wanting from the anterior 

 margin ; but the width of the pygidium in that part must have been 

 greater than its length. Ten or eleven articulations are visible on the 

 side lobes and twelve on the axis, which is very prominent and 

 moderately tapering. The axial rings are depressed, convex, becoming 

 smaller, more crowded, and more indistinct toward the apex. Ribs on 

 side lobes depressed, convex, decreasing in length, breadth, and distinct- 

 ness from before backward, while at the same time they become more 

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

 distinctly marked groove, originating on the posterior margin at about 

 one-third the length of the rib 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 3-5ths the width of 

 the axis near the posterior part of pygidium, which is not visible in the 

 only specimen I have examined. 



Crustacean. — In Mr Hartt's collection there is a single fragment 

 which would seem to indicate a Crustacean different from the Trilobites, 

 and probably of higher type. It occurred in bed (e), and must await 

 the discovery of additional remains. 



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