Geology and Natural ILhtary. 475 



Coal-measares of Zwickau, in the * Zeitectrift der Deutschen 

 <M-'l<MiiM-lu-ii Gesellschaft" for 1882. It is named after its dis- 

 '■■■u-.r. Pn.i'.^nr Kivi-her. Kr> hcheria Wiedei. A tine plate 



">. Poh'nzoic Cockroaches.— Deseripti ons and figures of JS5fo- 



U-'tn,,,, tf„hrll„t„, var. Strlz,,,;,-;. /■:. / •• l ,,-h„ „<n-hi :md Oryctoblat- 



G. Chk. 





-black, almost black: in p:irts iridescent. Opaque 

 finest edges. Brittle. Fracture uneven. Streak, 

 Hardness, about 6. Fuses between 4 and 4-5. 

 r, 4-9478. In the closed tube decrepitates and 

 ;le slightly acid water. Readily and completely 

 heating with concentrated sulphuric acid. Analysis 





HiiH> 



