i66 
BULLETIN OF THE LABORATORIES 
perforated by minute, vertical, communicating canals. Margins of 
zoaria non-poriferous. (Ulrich, Am. Pal. Bry. April, 1884.) 
Genus RHINOPORA, Hall- 
Zoaria consisting of two laminated expansions, grown together 
along their epithecal membranes; the margins are non-poriferous. 
The cell apertures are strongly raised above the surface in little papil- 
lae or pustules. The aperture itself is quite small and usually appears 
more or less irregular in form, suggesting the crescentic lip so char- 
acteristic of the CystodictyonidcE and FistuliporidcF,. The interstitial tis- 
sue, if any, seems to have been obliterated by the secondary deposit of 
sclerenchyma. 
XV. Rhinopora verrucosa, Hall. 
{Plate XV, Fig. 13 ; Plate XVII, Fig. 12.) 
Rhinopora frondosa, Hall .and Whitfield, 1871;, Ohio, Pal. Vol. II. 
Escharina (?) distorta, James, 1879. " 1 "^^ Paleontologist, No. 3. 
Rhinopora venosa, Spencer, 1S84, Niagara Fossils, St. Louis Acad. Science, 
Vol. IV, No. 4. 
Cf. Rhinopora curvata, Ringueberg, Bull, Buffalo. Soc. Nat. Sc., Vol. V, 
No. I. 
Fronds forming thin expansions, the defining margins being sharp 
and distinctly non-poriferous. Specimens usually occur in the form of 
fragments, smaller pieces of which appear flattish, and some pieces of 
even fair size may be found with only a moderate amount of curva- 
ture. However, when broken from the solid rock, parting along the 
epithecal membranes, expansions may be followed for 30 mm. or more 
through the rock, contorted and curved in almost every possible man- 
ner. Proper branching does not take place, but the outlines of the 
fronds are often quite irregular. The character of the base of the 
frond is unknown. The cells are arranged in diagonally intersecting 
rows which may be quite straight for a moderate distance, but usually 
are somewhat curved. This arrangement may be perfectly maintained 
over quite a large portion of the surface, but frequently is perfect only 
in small patches, the rows of which do not perfectly join each other, 
on account of the introduction of new rows, the sudden curvature of 
