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nearly all reaching quite to the center; dissepiments numerous, 
from two to five or more in each interseptal space in a corallite 
five millimeters in diameter. In longitudinal sections the vesicu- 
lar tissue is well shown and the vesicles are elongated with their 
longer diameter rising obliquely toward the outer surface. Calyx 
small, wall thin at the margin but gradually thickening to the 
bottom of the cup which is from three to five millimeters in depth. 
Bottom of the cup almost a point. The calyces are rarely found 
due to the mode of preservation of the upper part of the colony 
mentioned above. 
The epitheea is thin and weak and is marked by rather sharp, 
delicate, and slightly elevated annulations between which, when 
well preserved, are other more delicate and finer rings; slender 
longitudinal ridges crossing these complete the decoration of the 
surface best seen under a lens. On the weathered and stained 
stem fragments in the upper part of the bed but a portion of the 
epitheea remains. 
This interesting colony evidently belongs to the family 
Cyathophyllidas but docs not agree closely with any of its well 
recognized genera. From Diphyphyllum it differs in the absence 
of tabulae, and the cells are not biareal, as pointed out in Romin- 
ger’s diagnosis, 2 Moreover, the method of mutual support by 
intimate adherence is not a habit of the corallites of that genus. 
From Campophyllum it differs in that its septa reach to the 
center as well as in other obvious particulars. It seems to agree 
best with some of the fasciculate forms of the genus Cyathophyl- 
lum but lacks definite tabulas and the septa cannot be said to alter- 
nate in length with ‘ ‘ the longer septa extending to the center. ’ ’ s 
It may need finally to be relegated to a new genus but for the 
present it is placed in the genus Cyafhophyllum and the specific 
name calvini is offered in honor of the late Dr. Samuel Calvin 
who was a great admirer of the Scotch Drove reef. 
One or two things may be cited in concluding, first, while 
other coral species in the reef occur more or less abundantly at 
many places, Cyathophyllum calvini has not been observed at any 
other place than that described above. Second, the tremendous 
size of the colony is again emphasized when it is recalled that 
there were at least as many as twenty corallites to the square 
inch of surface. This would be equivalent to 25920 on a square 
" 2GeolT Mich. Vol. Ill, pt. 2, p. 120, 1876. 
3 Zittel, Text-book of Paleontology, Vol. I, 2d edition, p. 84, 1913. 
