385 



Megal. 



crowns of upper molars ; 10, sections of crowns of lower mo- 

 lars on the right side. Compare M, je-fFersoni^ Leidy. — Fonnd 

 in Port Kennedy cave, Chester Co., Pa., with fragments of 

 long bones of uncertain reference. Named after the late 

 Charles M. Wheatley, of Phoenixville, to whom the geology 

 of our State owes so much. — Post-pleiocene. 



Note. — These species of gigantic extinct sloths with enor- 

 mously powerful claws (onyx, hence the generic name) lived 

 with gigantic Armadillos^ Mammoths^ &c., in Pennsylvania 

 just before the Glacial and Human age set it, and some of 

 them even later. — The large extinct fossil animal remains of 

 the Windward islands, the Brazilian fossil tiger and armadillo 

 lately found by Mr. Willcoxin Florida, &c., show the separation 

 of N. and S. America as a recent event. 



* Megalopteris, Dawson; a genus confined to Devonian and 



TLB, 



Suhoarhoniferous formations; related to Neuropteris on the 

 one side, and Alethopteris on the other; having nerves like 

 those of iV. and leaflets arranged like those of A, Its nerva- 

 tion alone distinguishes it from Heer's genus Dan(jeopteris^ 

 Lesquereux in Coal Flora, page 148. Oollett's Indiana Kpt. 

 1883, i^ate 9, fig. 2.— VIII, IX, X. 

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