Foerste. 
343 
[May 1, 
margin of the calyx is usually slightly elevated, thus adding to the 
suggestiveness of the specific name. The septa as a rule are almost 
straight in the flattened portion of the calyx, although sometimes 
slightly curved, yet never as much so as in the Niagara specimen 
figured from Louisville, Kentucky. The vertical height of the spec- 
imen is about 33 mm. The external surface of the specimen is 
vertically marked by the septal furrows, which are in many places 
rather indistinct, and by concentric quite strong wrinkles with very 
few concentric striae ; the preservation of the exterior of the speci- 
men is such as to suggest that fine striae, even if originally present, 
have probably not been preserved. Various pits and markings on 
one side of the specimen may indicate the bases of former rootlets, 
but of this no certainty is felt. A section at the base of the speci- 
men shows transverse dissepiments when the septa are not contig- 
uous. 
Diphyphyllum cjespitosum, Hall. 
This species is common at Brown’s Quarry west of New Carlisle 
Ohio, and at Ludlow Falls, Ohio. The specimen here described 
came from Brown’s Quarry. The catyces have not been found well 
preserved, and beyond the fact that they are concave towards the 
centre, nothing can be said. The average diameter of the stems 
is 7.5 mm. The branches bud from the sides of the parent stem, 
have a diameter of about 3 mm. at their point of origin and grad- 
ually increase in size until again equalling the parent stem. The 
stems are cylindrical, abundantly striated transversely, the striae 
sometimes assuming the proportions of stronger wrinkles, but never 
to the extent assumed in Diphyphyllum rugosum , Milne-Edwards. 
The form of that species figured by Rominger from the Niagara 
Group of Louisville occupies an intermediate position between the 
more typically rugose form figured by W. J. Davis from the Upper 
Niagara of Louisville, Kentucky (PI. 109, fig. 1) and our Ohio Clin- 
ton form. The stems average about forty-five or fifty vertical sep- 
ta of which one-half usually do not extend for more than 1.8 mm. 
towards the centre of the stems, the other half in large part termi- 
nating within 3 mm. from the border of the stem, while frequently a 
few twisted ends of the septa extend to the very centre of the stem. 
The septa are crossed towards the centre by horizontal diaphragms, 
which may occur at the rate of five or even more in a length of 
3 mm. Near the ends of the smaller septa, within 1.8 mm. of the 
