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BULLETIN OF THE LABORATORIES 
the serrations decrease in prominence with the size of the specimens ; 
the indentations are bordered by crescentic non-poriferoiis spaces ; 
these spaces are large and conspicuous in the larger forms, decreasing 
to narrow, but distinct proportions in the smaller specimens. The 
specimens from New Mexico, Kentucky and Chester, Illinois, are un- 
doubtedly the same as our Ohio forms. Those from Colorado are 
readily connected, it seems, by the variable forms at Danville, Illinois. 
In conclusion, I desire to express my gratitude to Prof. C. A. White, 
of the National Mviseum at Washington, for the ready access to the 
specimens described by him from western localities. The above dis- 
cussion is designed merely to present a better understanding of this 
species, from the abundant material which it has been my good for- 
tune to see. 
Common at Bald Hill; rare at Flint Ridge. 
ACANTHOCLADIIDH:, Zittel. 
Ramose bryozoa, dendroid, pinnate, or forming fenestrated ex- 
pansions, consisting of strong central stems and smaller lateral branch- 
es proceeding from the margins; the latter uniting in fenestrated gen- 
era with the branches of adjacent stems. Stems and branches both 
poriferous on one side only, non-poriferous dissepiments therefore 
absent. 
Genus GLAUCONOME, Goldfuss. 
Main stem very slender, branches springing from the stem at large 
angles, often at almost right angles. Celluliferous face of both' main 
stem and branches with two alternating, longitudinal series of cells. 
Non-poriferous side longitudinally striated. 
VI. Glauconome whitii, sp. n. 
{Plate VII, Fig. 4, <7, ci) 
Largest specimen 18 mm. long and 6 mm. wide, evidently not a 
complete zoarium. The stem is very slender, rounded, and regular 
in thickness, having a diameter of about .22 mm. On either side are 
branches, diverging from the stem at an angle varying from 65 to 82 
degrees, usually nearer the angle first given. These branches are of 
two kinds; the smaller kind are very narrow, about. 13 mm. wide, 
and rather short, a millimetre or less is the length of the largest, so 
