BRACHIOPODA — TELOTREMATA. 



347 



397. W. cylindrica Hall. (Fig. 445.) Siluric. 



Elongate-cylindrical. Width and thickness nearly equal. Beak 

 of pedicle valve strongly overarching. Faint mesial depression 

 present in pedicle valve. Surface marked with fine radiating striae 

 near the front. 



Clinton-Niagaran of New York, Ohio. Ontario, Anticosti. 



Fig. 445. Whitfieldella cylindrica (Pal. N. 

 Y.'IV.). 



4^ <^ 



Fig. 446. Whitfieldella inter- 

 media (Pal. N. Y., II.). 



398. W. intermedia Hall. (Fig. 446.) Siluric. 



Obovate, rapidly expanding toward the front which is abruptly 

 rounded. Length and width nearly equal. Faint lines of growth 

 on surface. 



Clinton and Niagaran of New York, Pennsylvania, Ontario. 



^ y^ 



Fig. 447. Whitfieldella nitida (Pal. Fig. 448. Whitfieldella nitida var. ob- 

 N. Y., II.). /fl/^(Pal. N. Y., II.). 



399. W. nitida Hall. (Figs. 447-448.) Siluric. 



Varies from broadly to narrowly ovate. Valves strongly and 

 equally convex. Beak of pedicle valve pointed and incurved. 

 Surface smooth except for concentric growth lines which are at 

 times strongly marked. Often a slight sinus occurs near the front 

 in both valves, producing a slight frontal emargination. 



Niagaran of New York, Kentucky, Indiana, Ontario, Anticosti. 



