107 
In many respects F. tenuiceps (Hall) very closely approximates to F’. plebcia (McCoy), 
from the Carboniferous and Devo.ian Rocks of Britain, the chief difference of importance 
being that the fenestrules in the latter are suid to be rect ngular, whereas they are oval in the 
former. I should doubt if the two forms are specifically distinct. 
Locality and Formation.—Abundant in the Corniferous Limestone of Port Colborne, 
Ridgeway, and Lot 6, Con. 1, Wainfleet. Also common in the Hamilton Formation at 
Bartlett’s Mills, near Arkona, Township of Bosanquet. 
131, FENESTELLA FILIFORMIS (Nicholson), 
Polyzoary exceedingly delicate, composed of parallel, extremely narrow branches, about 
_ fifteen or sixteen of which occupy the space of one quarter of an inch. Dissepiments thread- 
like, narrower than the branches, expanded at their points of junction with the branches, 
separated by intervals of about ;1, inch. Fenestrules gne-third wider than long, rectangu- 
lar or transversely oblong, twenty-four in the space of one quarter of an inch measured 
vertically, and about fifteen in the same space measured transversely. Celluliferous side 
unknown, 
I have only fragments of this species, and none of these show 
the celluliferous aspect ; but the proportions of the polyzoary are so 
entirely distinct from all other previously recorded species of the 
genus, that no doubt can be entertained as to its being new. It is 
i very readily distinguished by its filiform and closely-set branches, 
Pe. 2: by the unusual character that the fenestrules are markedly wider than 
a Fragment of Tenestella ° : Z 
filiformis [Nich.] natural size; long, and by the extraordinarily large number of fenestrules in a 
fidl, From the Comiferous Give Space measured vertically. 
Limestone. 
Locality and Formation.—Corniferous Limestone, Lot 6, Concession 1, Wainfleet. 
$ 
Genus Tanropora (Nicholson), 
x 
Canadian Journal, Vol. XVI., No. 2, and Geological Magaztne, March, 1874. 
Polyzoary calcareous, composed of a flattened, linear expansion, which branches dicho- 
tomously and is celluliferous on both sides. ach side of the polyzoary (sometimes one side 
only 4) is furnished with a strong median ridge or keel, which has a longitudinal direction, 
and separates the frond into two lateral halves. The cells have prominent mouths, and are 
arranged in from three to five longitudinal rows on each side of the central keel ; the cells of 
contiguous rows alternating, so that a series of short oblique rows of cells are produeed which 
diverge from the keel like the barbs of a feather. The margins of the polyzoary are usually 
plain and non-celluliferous, and the cells are not 
separated by longitudinal strize or elevated ridges. 
No fenestrules are present, and the entire frond 
forms a continuous expansion within which the 
cells are immersed. 
Two species of Polyzoa which agree in the 
above characters are not uncommon in the Ha- 
milton Formation of Western Ontario, and their 
structure appears to me to be sufficiently distine- 
tive to entitle them to be considered as consti- 
tuting a distinct genus, which I propose to call 
Tenioo:ra. The affinities of Teniopora are clearly 
with Pelodictya, and though there are some im 
a. Fragment of Teeniopora penniformis (Nich.) na- 5 : 
tural size; 6. Transverse section of the same enlarged ; c. portant points in the structure of the former 
Fragment of the same enlarged; d. Fragment still fur- ° ‘ F } 
ther enlarged, showing the prominent mouths of the cells. which [ have been unable to make out, I still 
From the Hamilton Formation. think that the external characters of Teniopora 
alone warrant generic distinction. One of the chief characters of Ptilodictua is the presence 
of a flattened laminar striated axis separating the two celluliferous aspects of the polyzoary. 
I have not been able to establish clearly either the presence or absence of such an axis in 7'@- 
niopora, but my specimens lead me to believe that it is absent, and that there is instead, a ver- 
