304 THE CARBONIFEROUS SYSTEM. 



Pleurophorus quadricostatus n. sp. (Fig. 107), coll. Hartt, Stewiacke. 

 — Shell elongate, beaks near anterior end. Hinge-line nearly straight, 

 central margin with a fold and sinus under the beak, and curving 

 thence to the rounded posterior end ; four obscure radiating ridges 

 diverging from the beak to the posterior margin, crossed by low con- 

 centric undulations. Length, five lines. Bed (e). 



Fig. 107. — PleurophoriLS quadricostatus. Fig. 108.— Cardinia suh-angulata. 



Isocardia. — Like /. transversa^ De Koninck, but narrower. A cast 

 from East River, Pictou. Collected by Mr D. Fraser. 



Cardinia nana^ De Koninck, coll. J. W. D., Onslow, in an impure, 

 black, flaggy limestone. — The specimens are larger than the Belgian, 

 but otherwise similar. 



Cardinia suh-angulata, n. sp. (Fig. 108), coll. J. W. D., Pugwash. — 

 Form oval, with an obscure ridge from the beak to the lower part of 

 the posterior end. Surface covered with irregular lamellar lines of 

 growth. 



Cardijiia Antigonesensis, n. sp., coll. J. W. D., Antigonish. — 

 Regularly oval, but somewhat narrower posteriorly ; beak a little in 

 front of the middle. Breadth rather less than half the length. Sui'- 

 face marked with delicate growth lines, but smooth. 



Area punctifer, n. sp., coll. Hartt, Windsor. — Shell broad oval in 

 form, truncate posteriorly, the tumid beaks and middle portion de- 

 scending abruptly behind to the straight hinge-line. Surface with 

 regular flattened concentric ridges, crossed, especially near the posterior 

 margin, by oblique radiating lines, each composed of a thin ridge 

 bearing a row of minute papillse. Bed {a). The specimen is only 

 a fragment, but must have been nearly an inch broad and two inches 

 long when entire. 



Cardiomorpha Vindohojiensis, Hartt (Fig. 109). — This species is 

 known only by casts, one of which is faithfully represented in the 

 figure. 



Cardiomorpha Archiacana, De Koninck, occurs with the above in 

 the Windsor limestones. 



Conocardium Acadianum, Hartt (Fig. 110), coll. Hartt, Windsor. — 

 Triangular, with a very prominent central ridge. Prolonged posteri- 

 orly into a very long wing or siphonal tube. Anterior slope marked 



