OF DENISON UNIVERSITY. 
16 1 
branches above. All specimens seen were divided at the epithecal 
membrane, which is wrinkled transversely by lines of growth, lunate 
in the middle, the ends deflected backwards along the sides, the round- 
ed ends of the branches are preserved on some of the specimens. In 
specimens whose branches have' become contiguous and have grown 
together at the base of the frond, the wrinkles or lines of growth still 
indicate readily the position of the branches. 
Branches thin and flat, the exterior surface not seen, but the cross- 
sections made gave no evidence of tubercles, and therefore the surface 
is believed to be flat. Cells oval, arranged in longitudinal series, 8 
cells in a distance of two mm, and 10 or ii series occupying the same 
distance in breadth. The series of cells are separated by thin, straight 
lamellae, which are not intruded upon by either cells or interstitial cells. 
Interstitial cells, two, between the ends of the cells, becoming more 
numerous in one or two of the marginal series ; the margin is thickly 
supplied with them, making it poriferous; poriferous margin narrow. 
Frond about 75 mm. long and 70 mm. broad. Branches from 
2.5 to 4 mm. broad. Cells, 8 in a distance of 2 mm, measured lon- 
gitudinally, 10 or II in the same distance measured transversely. 
It will be noted that this species assumes a sort of intermediate 
position between the last and the following. In fact the difference in 
the width of the cells and the different manner of branching, both 
variable factors, alone distinguish them one from the other. 
Locality and position. Soldiers’ Home Quarries, collection of Mr. 
Geo. Caswell. Also, Brown’s Quarry, a form with more distant 
branches. Clinton Group. 
IX. Ph^ngpora fimbriata, James. 
{Plate XV, Fig. 7 .) 
Ptilodictya fimbriata, James, 1878, Paleontologist, No. i. 
Stictopora Van Clevii, Hall, 1883, 12th Indiana Geo. Report. 
Frond arising from a small narrow stipe, attenuated towards 
the base, expanding gradually above until a width equal to 
the branches is attained; then branching dichotomously at va- 
riable intervals in different or even in the same specimens ; 
the branches usually flexuose, forming characteristic meshes upon 
the surface of the rock. Surface unknown, but from numer- 
