387 



Megam. 



Megalopteris minima, Andrews. See Appendix, 

 Megalopteris ovata, Andrews. See Appendix, 



Megambonia aviculoidea, (Hall, 1859, Pal. N. Y., Vol. 3, 

 ^ p. 274, plate 49a, f. 8. Low. Held.) Clay- 

 ^j^ pole's list of fossils F2. preface, xiii. Speci- 

 men x-20 (two) west of Old Juniata Furnace, 

 Centre t., Perry Co. Lower Helderherq. — In 

 Bedford borough, it occurs in strata exactly like 

 the Tentaoulite limestone of New York, T2, 

 Pl.49ai. p. 89.— VI. 

 Megambonia ? cancellata, Hall. Dawson's Acadian Geol- 

 209 ogy, 1868, p. 602, fig. 209 ; surface cancellated by a 

 cross pattern of concentric and radiating, raised 

 Daw -^ss^ striae. Arisaig, Nova Scotia. — V? 



Megambonia cardiiformis. {Pterinea cardiiformis,) 



Hall, Report on the Fourth 



H. Vol.3. 



Y-VI 



v»r.tt 



Hall 6^'.. 



or Western District, of 

 New York, 1843, page 172, 

 fig. 68. 1, a perfect speci- 

 men; showing equal 

 valves ; hind wing ; radiat- 

 ing fine striae; prominent 

 growth lines ; large promi- 

 nent beak. Perfect casts 

 were also found at the place 

 (Clarence Hollow, N. Y.). 

 It clo5!ely resembles a 

 Pterinea (Megambonia) of 

 the Oriskany sandstone. — 

 Corniferous ( Upper Hel- 

 derherg) limestone forma- 

 tion. — VIII a. 



Megambonia jamesi, Meek. See Appendix, 



Megambonia lamellosa, Hall, Pal. N. Y., Vol. 3. 1859, Oris- 

 kany. Found at Mapleton, Huntingdon Co., Pa. Spec. 200-5 

 (three) from the Oriskany sandstone. Also in Royers' ridge 

 and Sandy ridge, at Orbisonia, and at Three Springs in the R. 

 R. cut through Oriskany, T, 35; T3, 119; see 00^ p. 235, spec. 

 702-2 (two). — This or an allied Oriskany species is seen in the 



