1899] MICROSCOPICAL JOURNAL. 53 



In fact, the marl is fresh-water and became brnckish by 

 evaporation. All natural water contains some solid in- 

 gredients, — chloride of sodium, and also some silica, or 

 oxide of silicon. Now let us see what Ehrenbpr;^- the 

 earliest observer found in the marls of the Great ri-iii • 

 In the report of llie geological exploiationof the fortietli 

 parallel, Vol. 1,]). 120, Clarence King says : "Specimens 

 of the white strat-i were subjected to microscopic analysis 

 by Dr. C. G. Ehn-nberg of Berlin, who found forty si. k 

 di^tinct species v^f diatoms. Of these, 28 have been classed 

 as Polygastera and 18 of Pliytolitharia, the most abund- 

 ant species being Gaillionella i^ranulatri, G. sculpta aiid 

 Spongiolithis acicularis. In a lavender colored bed far 

 up in the series above the acidic tuffs, further sundry 

 l)eds are observed in the same sections containing more 

 or less infusori;i, in which the following were found by 

 Mr. Charles E. Wright : Gaillionella- — -? Spongiolithis 

 acicularis, Pinnularia inasqualis, Coscinodiscus radiatns. 

 G. granulata is Melosira granulata and indistinguisha- 

 ble from M. distans as is G. sculpta. P. inaequalis is 

 Cymbella lanceolatum. C. radiatus is the last and evi- 

 dently th«i round end of M. distans, S. acicularis is 

 tlie sponge spicule I have found and comes from Spongia 

 iluvialiiis. In this way, Wright's and.Elirenberg's speci- 

 mens .-igree with mine. This shows that the Occidental 

 Sea covered also a part of Kansas east of the Rocky 

 ]\Ioun tains and makes of it a vast sea. Later I shall dis- 

 cuss the facts in California. I have lately received speci- 

 mens from tli(> Arizona bed of that sea. They vyere sent 

 by Professor \V. P. Blake, director uf the School of 

 Mines, Tucson, Arizona. 



Diatomaceous Earth from Arizona Containing Cvclotella. 



BY A. M. EDWARDS, Yi. D. 

 I have recieved from Prof. Wm, Bhike, Director of the 

 School of Mines, of the University of Arizona at Tucson, 



