Chemistry and Physics. 459 • 



mih. those of the 



aral arch is also less elevated in the speci- 

 'served, and the whole vertebra is more depressed. 

 I are pleurodont. The species was about two feet in 



iA!ii:tli of posterior dorsal vertebra, from edge of cup 



1-ondofball, 2-SO lines. 



Wi.ltli of cup, 2- " 



['•I'll of Clip, . 1- « 



I ^iou of anterior zygapophyses, 4*30 " 



remains on which the present description is based were 



il by Mr. €. T. Ballard and the writer, in the Tertiary 



at Crrizzly Biittes, Wyoming. They are now in the Pea- 



•"'"N Museum" of Yale College, as are all the other specimens 



described in the present article. 



SCIENTIFIC INTELLIGENCE. 



I Chemistry and Physics. 

 1. On a new series of ammonia-platinum bases.— Y. T. Cleve, 

 to whom we owe an elaborate and valuable investigation of the 

 compounds of platinum with ammonia, has discovered a new and 

 remarkable series in which two atoms of tetratomic platinum com- 

 bine to form the hexatomic diplatinum. These compounds are 

 lormed by treating the iodide, iodonitrate 

 ^ros s base with ammonia, so that we have the formulas Pt, 

 «2aJ,e32N02, and Ptoa, . 2NH2 . O3 . 2NO2, or ; 

 aecordmg to Blomstrand's views : 



I I ^ Br 



