PERMO-CARBONIFEROUS FENESTHELLIDA. 191 
Relations and differences :—In 1885 Mr. Robt. Htheridge 
junr., described from Queensland, a species under the name 
of Polypora? Smithii,+ which resembles P. pertinax, but 
according to both the description and figure of this species, 
the material was not very good. However, Mr. Etheridge 
distinctly states that in P.? Smithii there are from 6 to 9 
cells in the space of a fenestrule, and as this is a character 
which seems very constant, it is considered sufficient to 
separate the two forms. 
Again Waagen and Pichl? identified one of the Indian 
species from the Upper Productus Limestone with Polypora 
biamica Keyserling,a Permian form from Russia, and from 
Waagen and Pichl’s description and figure, P. pertinax 
only differs in minor details. Unfortunately I have been 
unable to obtain access to Keyserling’s original description, 
but feel that the weight of probability is very much against 
the identification of the two forms. 
POLYPORA TUMULA sp. nov. (Pls. VII, fig. 3, FX.) 
Description :—Colony fan-shaped, the largest specimen 
in its fragmentary form, over three inches in length. Habit 
erect. Branches moderately stout, separated from each 
other by approximately their own width, bifurcating at 
rare intervals. Cross-bars stout but thinner than the 
branches, rounded. Fenestrules oval, about twice as long 
as broad. 
The non-celluliferous layer is thin. Its exterior, only 
known from casts, is apparently nearly smooth or faintly 
striated longitudinally. These striations are however 
more prominent on the interior surface, that is the one on 
which rests the bases of the cells. 
The exterior surface of the celluliferous layer is decidedly 
irregular, being elevated into numerous protuberances, 
* R. Etheridge junr., (13) p. 219, pl. 9, figs. 1-38; pl. 44, figs. 9, 10. 
* Waagen and Pichi, (8) p. 791, pl. xe, figs. 5, 6, 7. 
