209 



Disc. 



Discina convexa. 



xm 



..^.)SVy«>%:,V.-7?:5i--"\?5'-''S;i 



i«ii 



m^^^: 





ia DISCINA CONVEXA. 



Hamilton strata, VIII c. Spec. 858-17 (too poor to identify 

 with certainty) from Mansfield, Tioga Go. Chemung. VIII g, 

 Discina circe. (Billings, Pal. Foss. Vol. 1, 1862, Discina 

 lamellosa, Hall, 1847 ; OrhiciUa lamellosa, Bro- 

 derick, 1833.) Emmons, Am. Geo]. 1855. I, ii, 

 200, plate 8, fig. 10. — Trenton limestone forma- 

 tion. II c. 



(Shumard, Trans. 8t. Louis Acad. Sc. 

 Vol. 1,1858, p. 231, from 

 the Upper Coal Measures 

 of Kansas.) Gollett's In- 

 diana Rt. 1882, page 121, 

 plate 25, fig. 9, natural 

 size, upper side of upper 

 valve — Goal measures of 

 Vermillion Co., Ind. — 

 XIII. The second figure is from a specimen in Goll.Wyoming 

 Hist. Soc. at Wilkesbarre, from anthracite coal measures. Mill 

 Creek limestone, 1000' above Conglomerate No XII. Two of 

 these impressions are seen on the rock piece, one unmistakeably 

 of this species ; an inch across, a third of an inch high ; con- 

 centric lines well indicated. The other may be D. newierryi 

 but the two species are much alike. Heilprin, An. Rt. Geo. 

 Sur. Pa., 1858, page 452, f. 18. — Monongahela series. XV. 

 Discina conradi. Hall. See Appendix. 

 Discina convexa. Shumard, Trans. St. Louis Acad., 1858, 

 Coal measures ; doubtfully identified by Heilprin among the 

 Wyoming Hist. Soc. collection of anthracite fossils found near 

 Wilkesbarre, Pa. An. Rt.,1885, p. 452.— XZ/Z 



Discina ? both valves convex. Specimen 807-38 



(00, p. 235) Fellows and Genth's Coll. on Marshall's Creek, 

 Monroe Co., in Hamilton, VIII c. 



Discina discus. (Hall, 1859, Pal. N. Y. Vol. 3, p. 195, 



plate 9, fig. 13, Low. Held.) Claypole's list, 

 Perry Co. F2, xiii. Specimens X-10, 16, 

 20, twenty-one in all, Lower Helderberg 

 shale. Found also by Dr. Barrett near Port 

 Jervis, in the Stormville shale division of 

 the Lower Helderherg formation, White's 

 ^, ^ Pike Co., Rt. G6, p. 132.— VI 



