FOSSILS OF THE CARBONIFEROUS LIMESTOM.S. 



.",().", 



rounded. Anterior end gibbous and narrow. Very common at 

 Shubenacadie and Windsor, also in Cape 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. 



ft.— Macrodon SkubenaeadietuM {cast). 



Fig. 104. — Edmondia llm-ttii. 



Edmondia Ilartt ii, n. sp. (Fig. 104), coll. Ilartt, Windsor. — Trans- 

 versely oblong, flattened, regularly rounded posteriorly, marked with 

 \. ry 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 anomalu. 



Fig. 106. — Cypricardia 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 

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

 the central part with regular concentric folds. Fulcra! 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. 



( 'ypricardia insecta, n. sp. (Fig. 106), coll. Ilartt, Windsor, bed (a). 

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

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

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

 concentric folds. Length, one inch nine-tenths. 



