BRACHIOPODA—NEOTREMATA. 



203 



beak. Much like Schizomania but the brachial valve^has no radi- 

 ating striae. Pedicle area much elevated internally and cut by a 

 narrow, open fissure. Devonic-Lower Carbonic. 



Fig. 236. a, Schizocrania filosa, X 2 > specimen with dorsal or upper valve partly 

 removed, only the margin remaining (B) and showing interior of ventral valve (P), 

 showing broad notch and pedicle groove g ; /, walls ot groove ( Winchell &Schuchert) ; 

 b, c, Lingulodiscina nexvberryi, dorsal and ventral valves, X x (Ohio Pal.); d, Orbicu- 

 loidea convexa, dorsal valve, X l 5 ^> Orbiculoidea missouriensis, X x > (Ind. Survey); 

 f, g, Discinisca iugubris, exterior and interior of dorsal valve, X l (Md. Surv). 



46. L. newberryi (Hall). (Fig. 236, b, c.) Lower Carbonic. 

 Brachial valve with prominent apex situated near the posterior 



margin. Pedicle valve slightly concave with excentric apex and 

 large oval foramen with deeply depressed margins. Shell thick, 

 strong and of a lamellose structure. Surface marked by fine con- 

 centric lines. 



Waverly of Ohio, Nevada. 



XVIII. Schizobolus Ulrich. 

 Oval, depressed convex. Apex of pedicle valve at terminus of 

 a rather deep notch in the posterior margin ; apex of brachial valve 

 subterminal and but slightly elevated with no notch present. Each 

 valve with a pair of muscle impressions situated posteriorly and 

 separated by a median ridge extending about one third the distance 

 to the front of the shell. Devonic. 



47. S. concentricus (Vanuxem). (S. truncatusHa.il.) (Fig. 237.) 



Devonic. 

 Very small, rarely exceeding one fifth inch in length. Broader 



