FOSSILS OP THE CAKBONIFF.ROUS LIMESTONES. 289 



one of the limestones of the Windsor scries, and is, T tliink, certainly 

 new and undescribed. The non-poriferous side has thick parallel 

 bifurcating ribs, with rounded surfaces finely striated longitudinally, 

 connected by much thinner and rounded cross bars, enclosing oval 

 fenestrules. The poriferous side has the bars angular above, and 

 with a central carina, bearing a row of small tubercles, which in the 

 best specimens arc seen to bear delicate spines. The pores arc in 

 two rows at the sides of the ribs. Its nearest allies are F. rcteformis, 

 Srhlot., and F. carinata, M'Coy, but it differs materially from both, 

 more especially in its characteristic spines. 



Fcjiestella, another species, coll. J. W. D., Stcwiacke, with two 

 rows of large contiguous pores. Resembles F. Morrisii, M'Coy, but 

 las the pores closer to each other. 



Fenestclla with larger fenestrules, not determinable. Coll. J. W. D., 

 West River, Pictou. 



Jlrrenicea, Lamx. — Two species of encrusting Polyzoa occur on 

 shells in Mr Ilartt's collections from Windsor. They may, in the 

 meantime, be referred to this genus, but are not determinable. 



Brachiopoda. 



The following descriptions of the Brachiopods of the Carboniferous 

 limestones of Nova Scotia arc extracted from Mr Davidson's paper 

 above referred to, and the figures are from his drawings :— 



" Terebratula sacculus, Martin, sp., 1809, and varieties (Fig. 87). 



" Terebratula dongata and T. sujlata, De Vemeuil, in Sir C. Lyell's 

 'Travels in North America,' vol. ii., p. 220, 1845; and in Dawson's 

 'Acadian Geology,' p. 219 (Fig. 27), 1855. 



Fig. 87. — Terebratula sacculus, Martin ; and interior, sJtoicing loop. 



" All the Terebratidce from the Lower Carboniferous strata of Nova 

 Scotia that have been forwarded to me by Dr Dawson, as well as 

 tlh.se brought from that country by Sir C. Lyell, are variable in shape, 

 but are evidently referable to a single species. M. dc Vemeuil has 

 identified this shell with Schlotheim's T. dongata, and mentions that 



