THE CARBONIFEROUS PERIOD. 183 
netted wings attaining an expanse of fully seven inches, and 
therefore much exceeding any existing Ephemerid in point 
of size. 
The lower groups of the J/o//usca are abundantly represented 
in the marine strata of the Carboniferous series by Polyzoans 
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to 
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Fig. 126.—Carboniferous Polyzoa. a, Fragment of Polypora dendroides, of the natural 
size, Ireland ; a’ Small portion of the same, enlarged to show the cells; 4, Glauconomie 
pulcherrima, a fragment, of the natural size, Ireland; 4’, Portion of the same, enlarged ; 
c, Thecentral screw-like axis of Archimedes Worthen, of the natural size—Carboniferous, 
America; c’, Portion of the exterior of the frond of the same, enlarged ; ¢”, Portion of 
the interior of the frond of the same showing the mouths of the cells, enlarged. (After 
M ‘Coy and Hall.) 
and Lrachiopods. Amongst the former, although a variety of 
other types are known, the majority still belong to the old 
group of the ‘‘ Lace-corals ” (Feneste/lide@), some of the charac- 
teristic forms of which are. here figured (fig. 126). ‘The graceful 
