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POPULAR SCIENCE REVIEW. 
Since this article was printed I have come across another of 
Dr. Koch’s pamphlets. It is a “ second edition” of the New 
York pamphlet of 1845. In the main it is the same with the 
earlier one of that year. The most important difference is in 
the first half of the title-page, which reads as follows : 
“ Description of the Hydrarchos Harlani (Koch). (The 
name Sillimanii is changed to Harlani , by the particular 
desire of Professor Silliman.) A gigantic Fossil Keptile, 
lately discovered by the author, in the State of Alabama, 
March 1845.” 
A second difference is in the appended matter of nearly 
ten pages, which extends the pamphlet to twenty-four pages. 
This matter consists of (1) an extravagant article from “The 
New York Dissector;” (2) the article from “ The New York 
Evangelist ” about the Hydrarchos and Leviathan, alluded to 
on page 344, as occupying the inside pages of the pamphlet of 
1853 ; and (3) a puff from “ The New York Morning News.” 
A third novelty is a large wood-cut of the Hydrarchos 
Harlani , covering the last page of the cover. The body of 
the pamphlet contains only some verbal changes. 
These New York pamphlets of 1845 contain one significant 
discovery of Dr. Koch’s, made during his “ geological tour,” 
which is worth citing. He says : “ When at Gfolconda, Illinois, 
I discovered a large deposit of old red Sandstone or Devonian 
system, in which I found a great variety of non-described fossil 
fish of most wonderful forms, the spiral columns of many of 
them bearing a striking resemblance to a screw, so that they 
are called by the inhabitants of the country ‘petrified screws .” 
The Doctor’s “ spiral columns ” of “ fossil fish ” are the com- 
mon Bryozoan corals of the genus Archimedipora , found there, 
and elsewhere, only in Subcarboniferous rocks. 
