42 



point and bere the day settles being at least a yard deep. At the 

 Great Swamp which is farther up the river near Mendum the clay 

 is not so blue and pure. It is sandy. The blue of the clay is made 

 tVom organic matter, the vegetables that decompose in it. 



In this blue clay at llatheld Swamp 1 found Bacillaria, brackish 

 ones, mixed with fresh waler ones, which 1 will now describe. ta- 

 king them alphabetically in order. 



Amphiprora ventricosa C. G. E. 1847, Ber. p. 479. This is not 

 Amphiprora venlricosa F. T. K. 1844, Bac. p. 74, t. 20, fig. VII. 

 which is A rìiomboides C. G. E. 1843, Abh. p. 121. and is found in 

 the brackish water in the North Sea coast. It is fresh water and is 

 found in the material of the Staked Plain, Texas and is described 

 by L. WooLMAN and Dr. D. B. Ward in the American Naturalist 

 1892. 



The Staked Plain material belongs to the Occidental Sea, the 

 Eocene. The Aviphiprora is carried down into the sea and becomes 

 A. subsessilis V. T. I\. It has the samc markings as that form but 

 the outline of the valve is different, having a centrai intlation. Olher- 

 wise it is the sanie. A more or less inflation of the valve at the end 

 or middle cannot of course he used as a specifìc or form distinction. 

 On the F. V, it looks likc Acìinaìilhidium coarctatuni C. (j. E. 184?», 

 Ab. T. I, I, II, fig. 126. 



Aclinocvclus Ralf sii W. S. This is common in the clay of the 

 flatheld Swamp and is remarkable as being a marine form as usually 

 found. It is the first marine form that I bave found growing and 

 alive in the world in fresh water, and shows that f^acillaria are first 

 found in fresh water. 



It also proves my hypolhesis is correct that thcy were first 

 created to grow in fresh water. 



It becomes a problem to prove how they were created, by 

 spontaneous generation, or rather by Arcllebio.-^is, or otherwise. I 

 think Ihe were created by ICnci'genisis. But as Energenisis is a new 

 proces which I will describe hereaftcr I postponc the description of 

 il to a future time. 



The Aclìnocyclus Ralf sii is àlso found in the clay of the F\ìssaic 

 River at Cooke's Bridge about two and a half miles furthcr up the- 

 stream. It is found in the mud of the Passale River between Eittle 



