ORDOVICIAN FAUNAS. 213 
mum width, 1.5 mm. to 2 mm.; distal extremity narrow and abrupt, 
with two short, lateral spines; and an extension of virgula for 2 mm. 
to 6mm. Proximal extremity abrupt, showing a prolongation of the 
virgula, which terminates in a “disk,” varying in shape (apparently 
with age) from narrowly lanceolate to broadly elliptic, 6 mm. to 10 
mm. long and 1 mm. to 3 mm. broad. Thece thirty to thirty-six in 25 
mm.; short, perpendicular, apertural margins concave, the excava- 
tion nearly horizontal (slightly inclined distalward), occupying nearly 
one-third of width of the polypary.”—Gurley. 
Remarks.—This species is very distinct from C. bicornis and C. 
typicalis, differing from the former in the absence of the three promi- 
nent spines and the disk developed around them, and from the latter 
by the constantly prolonged virgula. It is also much smaller than 
either bicornis or typicalis. 
DICRANOGRAPTUS RAMOSUS (Hall). 
Plate XVI., Figs. 10-11. 
a847. Graptolithus ramosus Hall, Pal. IN. Y., vol. I., p. 270, pl. 73, 
figs. 3 a-h. 
Description.—Polypary flat, hnear below, with thece on two sides, 
dividing above into two divergent branches, which bear thece on the 
outer margins only. ‘Thece obtusely rounded at their outer ex- 
tremities, rather distant, shghtly narrowed toward the base, about 
twelve occupying the space of 10 mm. 
Remarks.—This species may be easily recognized by its bifureating 
polypary, being different in this respect from any of its associates in 
the New Jersey fauna. 
