1889.] 
339 
[Foerste. 
branching, even three branches from the same part of the parent 
stem not being a common occurrence in the Ohio Clinton specimen. 
Aulopora precius, Hall, compressus, var. nov. 
Corallum found at Ludlow Falls, Ohio, in the Clinton, parasitic, 
consisting of elongate tubular cells attached to some species of 
Clathrodictyon. The cells begin with a diameter of .8 mm., grad- 
ually enlarge to about 1.7 or 2 mm. at the aperture, at the same 
time becoming more or less vertically elevated above the object to 
wdiich the corallum is attached, to the extent of about 2 mm. at the 
apertural end. The cells are usually strongly flattened or com- 
pressed on the sides, and wrinkled transversely. The distance be- 
tween the budding averages 6.5 mm. After budding the parent 
turns upward and ceases to grow, the aperture being oblong-oval, 
the greater diameter 1 mm., the transverse diameter .3 mm. Owing 
to the wearing away of the specimen the aperture usualty appears 
more nearly circular having a greater diameter of 1.3 mm. and a 
transverse diameter of 1 mm. Budding takes place beneath and 
slightly to one side of the parent cell in a direct line, or more to 
one side diciiotomously, the two new cells forming angles of about 
45° with each other in the particular specimen here described. 
The species was described from the Niagara at Waldron, Indi- 
ana. The Clinton form from Ohio differs in the lateral compression 
of the cells, the greater length is between the budding, and nor- 
mally there is a smaller, less flaring and less rotund mouth. Aulo- 
pora precius, as figured by W. J. Davis from the Niagara of Louis- 
ville, Kentucky, presents a vertical view precisely like the Ohio 
form with cell apertures slightly worp. 
Cyathophyllum celator, Hall, Daytonensis, var. nov. 
(PLATE IX, FIGS. 9-11.) 
The type specimen figured is from my own collection. The other 
specimens here figured and described are from the collections at 
the Ohio State Universit} 7 under charge of Prof. Edward Orton. 
The polyp corallum is simple, subturbinate, rapidly expanding be- 
low, the rate of expanding decreasing above, especially in the more 
elongate polyps. The base of the corallum is always decidedly 
curved, or bent towards one side, the curvature continuing more or 
less with the growth of the polyp, but becoming moderate near the 
