Cope.] ^-t-t [June 17, 



it for nickel and cobalt witli negative results. Associated with the iron 

 is native lead, in irregularly shaped rounded and flattened pieces, from 

 the size of a pin's head to about 0.5 inch in diameter. The lead is coated 

 with a crystalline crust of massicot, of a sulphur yellow to reddish yellow 

 color ; some pieces also show very brilliant but microscopic crystals, which 

 may be cerussite. Acetic acid dissolves this massicot, and leaves the 

 metallic lead, which then shows its crystalline structure. A small piece, 

 ou dissolving it in nitric acid, left an appreciable quantity of gold, but the 

 solution contained no silver. 



Prof. Cope made some observations on tlie Eeptilia of tlie 

 Triassic formations of the Atlantic reo-ion of the United 

 States. PTe observed that thirteen species had been described 

 and referred to ten genera. None of these had been referred 

 by their describers to their appropriate orders, and he had 

 undertaken an investigation of them, having for its object 

 such reference, as well as the determination of the closer 

 affinities. 



Three of the species he proved to be Dinosauria. He had already as- 

 signed Megadactylus and Batliygnathus to this division, and would now 

 add Clepsysaurus, Lea, from evidence dei'ived from an ischium discovei-ed 

 among the original remains. It resembled that of Megadactylus. 



Of the remaining ten species, he was satisfied that those referred to 

 Pateosaurus by Emmons, as well as the Compsosaurus and Eurydorus, 

 were founded on posterior teeth of Belodonts. He also said that nothing 

 was to be found in the descriptions of Rhytidodon, Emmons, and Omo- 

 saurus, Leidy, to distinguish them from Belodon, to whicli genus he was 

 inclined to refer the remains which had fallen under his observation. 

 Tlius, three species were certainly to be distinguished from the ten, viz: 

 Belodon caroliuensis, Emm., {Rliytidodon, Emm., f Centemodon sulcatus, 

 Lea); Belodon prisons, Leidy, {Pake.osaurus carolinensis, Emm., ? (Joonp- 

 sosaurus pri^cus, Leidy, Clepsysaurus pennsylvanicus in part, Emmons); 

 Belodon leaii, Emmons, {Clepsysaurus, Lea). The above wei-e not as- 

 serted to belong to the same genus without doubt, but that evidence to 

 distinguish them was yet wanting. He added a fourtli species, discovered 

 by Chas. M. Wheatley, in the Triassic tracks of Phcenixville, Pennsyl- 

 vauia, which was apparently distinct from the above, and of larger size. 

 The remains preserved were dorsal, lumbar and caudal vertebrae, with 

 costal and abdominal ribs; left femur and fibula nearly perfect;, portion of 

 pelvis; ungueal and chevron bones, etc. The femur measured thirteen 

 inches in length, and the lumbar vertebrae exhibited slender cylindric 

 diapopliyses, which bore ribs to the sacrum. This reptile was named 

 Belodon lepturus, and was estimated to have attained a length of about 

 twelve feet. 



Eleven of the thirteen species being thus disposed of, there remained 



