BRACHIOPODA — TELOTREMATA. 



307 



306. T. vanuxemi Lyell and Forbes. (Fig. 384.) Cretacic. 



Valves more convex than preceding, plications more numerous, 

 less angular and less distinct, except occasionally in central portion 

 of valve. 



Upper Cretacic (Monmouth) of New Jersey, etc. 



^t^ws*^ 



Fig. 384. Terebratella vanuxemi. Dorsal and side view of average form ; dorsal 

 view of more finely plicate form. (After Whitfield.) 



XCVII. Zvgospira Hall. 



Subcircular, biconvex. Like Atrypa but small and with a median 

 plicated fold in the pedicle valve. Brachial valve marked by a 

 median sinus; cardinal process stout, bilobed. Spirals composed 

 of fewer coils than in Atrypa and turned inwards ; primary lamellae 

 united by transverse jugum (Fig. 385, e) ; surface sharply plicate. 

 Ordovic-Siluric-? Devonic. 



307. Z. recurvirostris (Hall). (Fig. 385, a-e.) Ordovicic. 



Length slightly exceeding width. Smaller than Z. vwiesta. 



Fig. 385. a-e, Zygospira recurvirostris ; nat. size and three views enlarged X 2 

 ((f) brachidium still more enlarged X 4 5 f~h Zygospira modesta, natural^size'and three 

 enlarged views X 2. (After Winchell and Schuchert. ) 



Trenton of New York, Kentucky, Wisconsin, Minnesota, On- 

 tario, Manitoba. 



