218 PALEOZOIC PALEONTOLOGY. 
DESCRIPTIONS OF SPECIES IN THE DECKER FERRY Fauna. 
COELENTERATA. 
ANTHOZOA. 
DIPHYPHYLLUM INTEGUMENTUM Barrett. 
Plate ovis Bice, 
1878. Diphyphyllum integumentum Barrett, Ann. N. Y. Acad. 
seis yok! L.,; sp: iza: 
Description.—Corallum simple, subcylindrical, gradually enlarging 
in size, the external surface marked by vertical, rounded coste and by 
more or less irregular transverse wrinkles. In transverse section the 
outer wall is seen to be thick; the septa are from forty-four to fifty-two 
in number, about every fourth one of which reaches the centre; within 
the outer wall is a zone about equal to the thickness of the wall itself, 
which is apparently free from dissepiments; within this zone, to the 
centre of the corallite, constituting about two-thirds of the entire 
diameter, dissepiments are always present in greater or less abundance- 
In vertical section the open zone, which appears to be free from 
dissepiments in cross-section, is seen to be occupied by large, nearly 
horizontal dissepiments, the central area being occupied by smaller 
and more nearly vertical dissepiments. 
The usual diameter of the species is from 12 to 15 mm., the outer 
wall being about 1 mm. in thickness. The longest individual ob- 
served, an incomplete specimen, is 45 mm. 
Remarks.—This species has only been observed in the condition of 
exceedingly irregular fragments, to which the matrix clings tightly, 
and whose character can be recognized only in thin sections. 
Se Se 
