FOSSILS OF THE CARBONIFEROUS LIMESTONES. 307 



or a variety of the preceding. Its nearest relative in the Carboniferous 

 of Europe is, I think, /'. gibbosus of M'Coy. 



Aviculopecten Acadicus, limit (Fig. 114). — Left valve minute, 



I2ds of an inch in width, circular, arched, umhones not distinctly 

 n, posterior flattened moderately, not distinctly separated from the 

 umbo. Surface of valve, exclusive of the ears, which are not exposed, 

 ornamented by ten primary, narrow, prominent, raised radiating lines, 

 irated by a space equal to twice the width of one of the lines. 

 In these spaces secondary lines arise, not attaining the dimensions of 

 the primaries, so that the surface is covered with alternately large and 

 small lines; there are also a series of delicate concentric lines, which 

 gives to the surface a reticulated appearance. 



A single specimen of this pretty little shell occurs in Mr Ilartt's 

 collection from bed (a) at Windsor. It seems quite distinct from the 

 others. 



Aviculopecten cora, n. sp. (Fig. 115), coll. J. W. D., Shubcnacadie. 

 — Similar in general form to A. Lyelli, but more regularly tumid, 

 longer, with smaller ears, and the surface regularly marked with very 

 fine radiating striae, resembling those of Productus cora. 



Fig. 1 14. — Aviculopecten Acadicus; Fig. 1 15. — Aviculopecten cora; Fig. 116. — Arictdo- 

 sculpture magnified. sculpture magnified. pecten Debcrlianus. 



(I 



AvicuJopeetcn. — Fragments of large specimens from the Shubena- 

 cadie ; have broad nodose ribs, resembling Pecten p)Ucatus. 



Aviculopecten Debertianus (Fig. 116), n. sp., collected by J. W. D., 

 Lower Limestone, De Bert River. — Shell rather flat, broader than 

 long, small ; breadth less than half an inch. Anterior car narrow, 

 convex, separated by a deep notch from the margin. Posterior ear 

 very small. Surface in perfect specimens marked with concentric 

 farrows and obscure radiating lines. This species resembles P.pusillus 

 more nearly in genei'al form than any of the preceding, but in the 

 ears is nearer to P. depilis, M'Coy. 



Ptcropoda. 



Conularia planicostata, n. sp. (Fig. 117), coll. J. W. D., Irish Cove, 

 Cape Breton, Windsor, and Shubenacadie. — Form very elongate, 

 pyramidal. Cross section square, but by pressure becoming rhombic ; 

 Surface marked by thin raised ribs, in perfect specimens with very 



