64 



can be studied with comparitive case. The Desmidiae the second 

 and so on. 



But the geology on typographical features of the Legano Esta- 

 cado I do not wish to go further into at the present time as 1 shall 

 hereafter have something to say on this subject (/). Now 1 merely 

 wish to indicate of the vast sea which we are considering and 

 enumerate the fossil Bacillaria found on the Staked Plain. These 

 were named in a paper by Lewis Woolman, Henry Kain and Dr. 

 D. B. Ward in the American Naturalista for June 1892, since then I 

 have speci mens from Mr. Woolman and Dr. Ward and now I have 

 specimens of the earth itself from W. Kenedey of the State Geolo- 

 gica! Survey of Texas. 



The first specimen contained the foUow ing Bacillaria according 

 to Woolman and Kain. 

 Amphora ovalis C G. E. 



— uncinatum C. G. E. (^). 

 Achnanthes ventricosa C. G. E. 

 Campylodiscus clypeus C. G. E. 

 Cymbella cistula H. 



— lanceolatum C. G. E. 

 Denticula valida P. 



I must here say something about the group, called a genus, 

 Denticula, anent the figures of it in Van Heurck.'s Synopsis des 

 Diatomces de Belgique i8òo-i8ói. These forms are ali one a spe- 



(') 1 bave recently called to minti that the following is in the Proceedings of 

 the American Association for the advancement of Science 38 meeting at Toronto, 

 Ontario August 1889 a paper on The Geology of the Staked Plains of Te.xas, 

 with a descriptiou of the Staked Plain formation, By R. T. Hill, University of 

 Texas, Austin, Texas (Abstract). The Staked Plains show it to be an extensive 

 mesa, which was an interior base level in late Tertiary or early Quaternary time. 

 Its surface is covered by a freshwater lacustrine sediment, consisting of loam 

 and gravel for which the name of the Staked Plain formation is propeed. 



This does not account for the mode of formation of the .Staked Plain but 

 theory is given within. 



(2) In the paper in the American Naturalist Mr. Kain says that this is dou- 

 btless which Ehrenrerg figures as Coccoìiema iniciìiafuiii Proc. Roy. Ac. Ber- 

 lin 1870, pi. I (11), fig. 9. It is howerer an Amphora. 



