176 
PALAEONTOLOGY OF NEW-YORK. 
Genus INOCAULIS (nov. gen.). 
[Gr. ivog, Jibra, and xauXos, caulis .] 
A plant-like, corneous coral, with numerous bifurcating branches; structure fibrous or 
plumose. 
The texture of this coral is similar to the Graptolites, a black scaly crust or film being all 
that remains of the substance. From the specimens examined, it appears to have grown in 
groups, with rounded or flattened stems, which are dichotomous above, and more or less 
spreading. The structure is too peculiar to be mistaken, or to be referred to any established 
genus. 
571. 1. INOCAULIS PLUMULOSA (n. sp.). 
Pl. XL G. Fig. 2 a, h. 
Stems flattened, dichotomous ; structure fibrous or plumulose, apparently composed of im¬ 
bricating elongated scales or fibres, which spread equally on all sides. 
This coral is not abundant, though small fragments are frequently seen in the shale. It is 
very often replaced by iron pyrites, and where the surface is exposed to weathering, the fossil 
soon disappears, so that it is only on freshly fractured surfaces that the structure is preserved. 
Fig. 2 a. A part of several stems upon the surface of the shale. 
Fig. 2 b. An enlarged portion, showing the structure. 
Position and locality. In the Niagara shale at Lockport, Rochester and other places. 
(State Collection.) 
The corals of this group, described in the preceding pages, constitute the greater number 
and most conspicuous forms among the numerous species of this period. Further examinations, 
however, will doubtless much increase the number now known, since many imperfect and 
unsatisfactory specimens have fallen under observation, possessing characters distinguishing 
them from those described, but insufficient to furnish conclusive evidence of their affinities. 
