Khab. 



866 



above), a nut with many rounded ridges, and, as shown by- 

 some specimens, having had a hull or covering, portions of 

 which may be noticed in the figure. (Supposed by Lesque- 

 reax to be the perfect form of E, apiculatum,) Roof of Sharon 

 coal in Summit and Mahoning counties, O. XIL 

 Rhabdocarpon clavatum ? (St.) Gein. Lesquereux, Geol. 

 111. I V^, 461, pi. 31, f. 11. Coal Flora Pa.. 

 ^g:SS^ 1880, p. 581, pi. 85, figs. 14, 20, from Mazon 

 '^-^^S^^^SiSii? creek, 111., and Helena, Ark. Darlington 



led^ Beaver Co., Pa. (Q, 55.) Simpson's fig- 

 WZ^iL.ZacoesG)i ure (1889) of specimen 1026 a in Lacoe's col- 

 lection at Pittston, Pa. XIII, 



Rhabdocarpon costatum, Newberry, Pal. Ohio, Vol. 1873, 

 page 378, plate 44, fig. 8^ (for figure see the group above) a 

 large nut, with numerous keels, every other one strong and 

 sharp, the intermediate ones low and rounded. (Supposed by 

 Lesquereux to be identical with R, acuminatum^ which better 

 preserves the epicarp, or outer shell. Coal Flora, p. 579.) 

 Youngstown, O., in roof of Sharon coal near base of. XII, 



Rhabdocarpon danai,Foster, Annals of Science, Vol. 1854, 

 Coal meaaures. Pal. Ohio, Vol. 1, 1873, page 376, plate 44, 

 fig. 4 (see figure in the group above) ; a unique specimen of 

 an oblong, compressed, and finely striated nut from the roof 

 shales of the Zanesville, Ohio, coal No. 3 ; the nucleus sur- 

 rounded by a broad corrugated margin, in which are visible 

 four or five folds parallel with its edge; badly fractured, giv- 

 ing a poor idea of the fruit. (Newberry.) Pittston, Pa. (Coal 

 Flora p. 580.) XIII 

 Rhabdocarpon howardi. (Lesquereux Coal Flora of 



Penn. 18 80, 

 page 575, plate 

 85, fig. 24, from 

 some coal 

 measure sand- 

 stone in the 

 south of Ohio.) 

 Coliett's Indi- 

 ana Report of 

 1883, page 104, plate 22, fig. 10. A fruit perhaps referable to 

 Trigonocarpon. Coal measures, XIII 



