512 Systematic rAi.KoxTOLonY — TrrKU Devoxiax 



Dal^eaxklla sp. 

 Plate LIT, Fig. 



Descrljition. — A small well-defined ventral valve shows the oceasional 

 presence of a species of Dalmandla not unlike D. leonensis. Hall of the 

 Xew York Chemung fauna but perhaps more closely comparaljle to ]). 

 infcra Calvin from the Independence shales of Iowa. Nothing is known 

 I if tlie species except the exterior of the ventral valve which is subcircular 

 and transverse, gently ridged axially and with sliarply defined bifur- 

 cating striae. 



Length 7 mm.; width 9 mm. 



Occurrence. — Jennings Foemation. Polish Mountain section east 

 of Gilpin. 



Colle [. t io n . — ^I a ry 1 a n d Geologi cal Survey. 



Genus RHIPIDOMELLA CEhlert 

 iiHiriDOMELLA VANUXEMI (Hall)' 



Plate LIT, Figs. 7-13 



Occurrence. — Jennings Formation, Chemung Member. Two and 

 three-quarters miles southwest of Emind, West Virginia, in upper Tro- 

 pidoleptus zone. Parkheau Member. Williams Road, east of Cumber- 

 land, 1391 ; 2^4 miles southwest of Cumberland ; Eocky Bun ; Williams 

 Eoad on Polish Mountain, 1289, 1371, 1422. 



CoIlecHon. — Maryland Geological Survey. 



Genus SCHIZOPHORIA King 



Schizophoria striatula (Schlotheim) 



Plate LII, Figs. 14-18 ; Plate LIII, Figs. 1. ID 



Anomia Terebratulites striatulus Schlotheim, 1813. Min. Taschenbuch VIII, 



pi. 1, fig. 6. 

 Orthis impressa Hall, 1843, Geol. N. Y. Rept. 4th Dist., p. 267, flg. 2. 

 Orthis impressa Hall, 1867, Pal. of N. Y., vol. iv, p. 60, pi. viii, figs. 11-19. 

 Schizophoria striatula Grabau and Shimer, 1909, N. Amer. Index Foss., vol. 



i, p. 268, flg. 321. 

 Schizophoria striatula Cleland, 1911, Bull, xxi, Geol. Surv. Wis., p. 93, pi. xix, 



figs. 1-6. 



' For synonymy and description see page 165. 



