Peco. 



608 



specimen at all like this one (now in the Mas. N. Hist. Boston) 

 ever seen by Lesquereux. — XIII, 

 Peeopteris plumosa, Darlington bed. Q 54, 55. — XIII 

 Pecopteris polymorpha. Q 54, 55. — XIII 

 Peeopteris (Alethopteris) pretiosa, Hartt. Dawson's Acad 

 Geol. 1868, p. 553, fig. 192 L (See figure under P. serrulata 

 below.) Upper Devonian of St. John, N. B. — VIII-IX. 

 Peeopteris pusilla. See Psendopecopteris pusilla. XIII 

 Pecopteris rarinervis, Fontaine. Monograph, U. S. Geol. 



Sur. Vol. 6, 1883, page 

 48, plate 26, fig. 3, ulti- 

 mate pinna; 3 a^mag- 

 ni-fied\ 4, summit of 

 last pinna ; 4 «, mag- 

 niHed, Only known 

 by small fragments, 

 found in the Aspin- 

 wall Shaft tip, and at 

 Carbon Hill over the 

 bottom coal, Richmond field, Va. So much like Carhoniferous 

 forms as to excite suspicion; undoubtedly Mesozoic ; much 

 like Heer's European Asterocarpus meriani^ and A- platyra- 

 chis ; but pinnules always separate down to base. — Trias, 

 Pecopteris resupinata, Lesq. G. B. Simpson's figures of 



U.S. Bull. 6 



ofjbacoe's Col\ 

 dtTitktonJcL 



specimen No. 1097 a, natural size^ and 5, enlargement of one 

 leaflet, in Mr. Lacoe's Collection at Pittston, Pa., from Mazon 

 Creek, 111. Coal meaeures, XIII 



