OJ)si(/!(i'ii Ifci^ 



429 



roeks, published by Washington, ^ in each subdivision. Soiue 

 of the iinalyses fall into subdivisions, to which no name has 

 been given by the authors of the S3'sti?iu, and when this is the 

 case, I have suggested names, chiefly for convenience in refer- 

 ence, and these names have been placed in brackets. In the 

 complete classification there are five classes in all, and Classes 

 I. and II. each have nine orders. All the rangs and sub-rangs 

 into which Orders II., III. and IV. of Classes I. and II. are sub- 

 divided, are shown in the tables : — 



Class T. — Pkrsal.wk. 

 Ordkr II. Belgare (18) III. Columbake (125) IV. Hkitaxnare (378) 



Rang. 



V. 



Note.- -An x indicates that analyses arc known which belong to this division, 

 but that no name is suggested by the authors. 



I'nited States Geol. Survey, Professional Paper, No. 14. 



