160 SYSTEirATrc T*Ai.i:nNTor.()fiY — Middle Devonian 



narrow, clonpitc, imisiiilar scar occupies the posterior half of the space 

 between these ridges. Outside this i)air of median ridges is a second pair 

 of poorly defined and very divergent ridges which appear to mark the 

 outer limits of muscular areas. 



The peculiar, short, tripartite process on the exterior of the dorsal 

 valve of this shell was correctly figured by Hall and Clarke' in their 

 work on the Brachiopoda, but in the latest figures of this shell which have 

 appeared Dr. Clarke has figured as the interior of a dorsal valve' (PI. 

 41, Fig. Hi) a specimen which evidently represents a mould of the 

 exterior of the valve. 



This s])ecies occurs in the Onondaga fauna throughout the middle 

 Allegheny region. 



Occurrence. — Eomney Formation, Onondaga Member. Tonoloway, 

 Maryland, 1% miles south of Berkeley Springs, West Virginia. 



Collection. — U. S. Xational ]\Iuseum. 



\E. M. Kindle.] 



Genus STROPHALOSIA King 



Strophalosia truncata (Hall) 



Plate XIII, Figs. 14-1(; 



Strophoviena pxistiilosa Hall. 1843, Geol. N. Y., pt. iv, p. 180, fig. 4. (Not 



Pro(luctu.H pustulosus Phillips.) 

 Productus truncahis Hall, 1857, Tenth Rep. N. Y. State Cab. Nat. Hist., p. 171. 

 Productella truncata Hall, 1867, Pal. N. Y., vol. iv, p. 160, pi. xxiil, figs. 12-24. 

 Productella (Strophalosia (?)) truncata Whiteaves, 1889, Cont. Canadian 



Pal., vol. i, p. 112, pi. xvi, figs. 1, 2. 

 Strophalosia truncata Beecher, 1890, Am. Jour. Sci., .3d ser., vol. xl. p. 241. 

 Strophalosia truncata Hall and Clarke, 1892, Pal. N. Y., vol. viii, pt. i, p. 316, 



pi. XV B, figs. 24-2G: pi. xvii, figs. 10-15. 

 Strophalosia truncata Schuchert, 1897, Bull. U. S. Geol. Surv., No. 87, p. 419. 

 Strophalosia truncata Clarke, 1903, N. Y. State Mus., Bull. 65, p. 330. 

 Strophalosia truncata Grabau and Shimer, 1907, N. Am. Index Fossils, vol. ii, 



p. 240, fig. 292. 



Description. — Shell small, concavo-convex; hinge-line eqmiling or less 

 than the greatest width of the shell. Ventral valve gibbous in the 



' Pal. New York, vol. viii, pt. i, 1892, pi. xx, fig. 16. 

 - Mem. New York State Mus. Nat. Hist., No. 9, 1908. 



