FOSSILS OF THE CARBONIFEROUS LIMESTONES. 



307 



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

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



Aviculopeden Acadicus, Ilartt (Fig. 114). — Left valve minute, 

 5-32ds of an inch in width, circular, arched, umbones not distinctly 

 seen, 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, 

 separated 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 Hartt's 

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

 others. 



Aviculopeden cora, n, sp. (Fig. 115), coll. J. W. D., Shubenacadie. 

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

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

 fine radiating striiB, resembling those of Productus cora. 



Fig. 114. — Aviculopecten Acadicus ; Fig. 115. — Aviculopecten cora; Fig. 116. — Aviculo- 

 sculpture magnified. sculpture magnified. pecten Debertianus. 



Aviculopeden. — Fragments of large specimens from the Shubena- 

 cadie ; have broad nodose ribs, resembling Peden loUcatus. 



Aviculopeden 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 ear narrow, 

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

 very small. Surface in perfect specimens marked with concentric 

 furrows and obscure radiating lines. This species resembles P. pnsillus 

 more nearly in general form than any of the preceding, but in the 

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



Pto'opoda. 



Conularia planicnstata, 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 



