332 Shnd obtained from an Artesian Well. 



- perfect specimens of the silicious lorica of diato- 

 maces. All of the forms detected, with a single exception, are 

 rine in habit, and identical with those found living at the 

 present day on the coast of Florida, South Carolina, and else- 

 where. They are. for the most part, much broken, and often 

 but one or two individuals have been seen; in fact, the number 

 of specimens is very small, but still sufficient for identification. 

 They are as follows: — 



Inoptychus a nai ius. Chmphonema acuminatum. 



Amphora ? " marinum. 



A uli&cus prumosus. GrammatopTiora marina. 



radiatus. Navicula t 



Biddulphia rhombus. Orthosira sulcata. 



i ;,,i' >■< snii, Ihn/i. Plagiogramma Gregorianum. 

 I icinodiscus eccerUricus. " pygmwum. 



radlatns. Stawroptera aspera. 





%vbtili8. Syhrdi'it 



i 'lotetta Dallasiana. Terp&inoB musica. 



ZHplon, is ? Triii ntiiumfavux. 



Epithemia sorex. " punctatum. 



Eupodiscus radiatvs. Tryblionella punctata. 



SjHOK/t sj,i<uls, 



Donbtleea these remains of marine organisms are accompanied 

 by partially decomposed organic matter, resulting from the de- 



ited animals and plants, and it is from these as well as the 



diatomacesa that the inflammable gas is derived, and there are 



chaDces at the same time that oil may be obtained from the same 



ii has been demonstrated that the bitumen and oil of 



Pacific coasl is largely, if not wholly, derived from the enor- 



tratum made up f<>r the most part of diatomaceaa with a 



radiolaria, and extending from San Francisco to the lower- 



most portion of California on the slopes of the coasl range oi 



mountains, In this oonneetion the examination by means ol'the 



iofa Bpecimei e becomes of interest, w bile, 



