44. 



Cope.] ^^ [March 18, 



VIII. nrSINGEKITE, PSEUDOMOUPHOUS AFTEU CalCITE. 



Many years ago the late Julius E. Ralit, of Cleveland, Tennessee, sent 

 me a suite of minerals from the Ducktowa mines, which he was then 

 working. Among them was a specimen composed principally of the ores 

 of that mine,' pyrrhotite and chalcopyrite with a small admixture of 

 zoislte, which was covered witJi crystals of calcite, in part allcred into a 

 dark brown mineral with resinous lustre. The calcite is in the form ot 

 irregular hexagonal prisms, showing planes of a scalenohedron, the 

 smaller ones terminating in acute scalenohcdrous. The largest crys- 

 tals are abor.t 20""" in length and 10°"" thick. They all contain a 

 nucleus of unaltered calcite, the hi>ingerite surrounding the core of cal- 

 cite is from 2 to 4™"' in thickness. With a small quantity (0 2236 grm.) of 

 fairly pure m itcrial I made an analysis, the results of which show that 

 the pseudomorphous mineral belongs probably to hisingerite, gillingite or 

 thraulite, if they are not all moie or less pure varieties of the same spe- 

 cies. 



The analysis gave : 



Loss by ignition = 23.70 



SiOj = 24.42 



Fe.,0, = 49 02 



ZnO = 1.17 



CaO = 1.83 



MgO = 0.41 



100.55 

 University op Pennsylvania, March 16, 1887. 



Synopsis of the BatracTda and Ri'ptilia obtained by H. II. Smith, in tha 

 Province of Mato Grosso, Brazil. 



By E. D. Cope. 



{Bead before the American Philosophical Society, Marcli IS, 1SS7.) 



The Naturalist Brazilian Exploring Expedition commenced its work in 

 the province of San Paolo. From the neighborhood of Sao Joio do Rio 

 Negro a collection of Batrachia and Roptilia was forwarded to the writer, 

 and a list of them vvas published in the Proceedings of this Societjs 1884, 

 p. 18.").* Mr. Smith then went into the interior, crossing the mountains 

 into the province of Mato Grosso to Cuyaba. on the headwaters of the 

 Paraguay river. After a short sojourn at this town, he selected for resi- 



• In tills collection tliere occurs a specie^ of Pseudis which I had identified 

 with thti P. parad>xa. In oimparlson with the type of the P. mnnlidactyla the 

 specimens turn out to belong to that species, as supposed by Dr. Boulenger. 



