FOSSILS OF THE CARBONIFEROUS LIMESTONES. 



303 



rounded. Anterior end gibbous and narrow. Very common at 

 Shubenacadie and Windsor, also in Capo Breton. Its genus is 

 uncertain. 



Macrodon. — A fourth species is known to me only by a few casts 

 of the interior. It is more elongated than M. Hardingi^ and is 

 rounded at the posterior extremity. Its external surface is unknown. 



Fig. 103. — Macrodon Shiihenacadiensis {cast). 



Fisr. 104 — Edmondia Harttii. 



Edmondia Harttii) n. sp. (Fig. 104), coll. Hartt, Windsor. — Trans- 

 versely oblong, flattened, regularly rounded posteriorly, marked with 

 very coarse concentric lines of growth. Resembles E. sulcata, Phil., 

 of the English Carboniferous limestone, but is more elongated and 

 rounded posteriorly. Length one inch six-tenths, breadth eight- 

 tenths. 



Fig. 105. 



-Edmondia anomala. 



Fig. 106. — C'lipricardia insecta. 



[a] Outline of hinge-plate. 



Edmondia anomala, n. sp, (Fig. 105), coll. Ilartt, Windsor. — 

 Transversely elongate ; anteriorly elongate and pointed ; posteriorly 

 descending abruptly from a line passing backward from the tumid 

 beaks to the lower side of the posterior margin. Surface marked in 

 the central part with regular concentric folds. Fulcral plate extending 

 more than half-way from the beak to the posterior end, widening and 

 abruptly rounded posteriorly. Resembles a Sedgwickia in form, but 

 differs in the hinge. 



Cypricardla insecta, n. sp. (Fig, 106), coll. Ilartt, Windsor, bed («), 

 — Transversely oblong. Thrice as wide as long, anterior end very short, 

 posterior somewhat keeled. Hinge-lino rather more than half as long 

 as the shell, posterior margin rounded. Surface covered with strong 

 concentric folds. Length, one Inch nine-tenths. 



