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CLADOCARPUS VENTRICOSUS. 
Cladocarpus ventricosus. 
PU XRT. 
Trophosome.— Stem attaining a height of about an inch and a half, 
not fascicled, simple; pinnz alternate, each springing from a rather long, 
lateral process of the stem, somewhat waved. Hydrothece distant; front 
wall with a depression just below the margin, then greatly inflated ; 
margin with a long, strong tooth in front, and with shallow crenations 
in the rest of its extent; intrathecal ridge strong, transverse, springing 
from a projection of the posterior wall of the hydrotheca near its fun- 
dus, and reaching a pomt about midway between this and the anterior 
wall. Supracalycine nematophores scarcely overtopping the hydrotheca ; 
mesial nematophore quite detached from the hydrotheca. 
Gonosome. — Phylactogonia springing from the proximal internodes of 
a certain number of the pinne, which are situated near the distal end 
of the stem, twice bifureating; gonangia springing from the stem in 
groups, each group close to the axil of a pinna, obovate, with the sum- 
mit curved over the termino-lateral orifice. 
Dredged off Sand Key from a depth of 100 fathoms. 
This is a well-marked form; its singular ventricose hydrothece, and 
the complete removal of the mesial nematophore from the hydrotheca, at 
once distinguish it. In Cladocarpus dolichotheca the mesial nematophore, 
while equally free from the hydrotheca, originates close to its base, but 
in the present species its point of origin is removed much farther back, 
and the entire nematophore is adherent to the front of the internode. 
The septal ridges of the hydrothecal mternodes are very distinct. 
Where the stem towards its proximal end ceases to carry pinne, it is 
provided with two or three very oblique joints, each of which carries a 
fixed nematophore, and similar nematophores are continued down the 
stem in a longitudinal series, at short and equal intervals (Fig. 5); here, 
again, as in Cludocurpus dolichotheca, strongly suggesting the disposition of 
the denticles in one of the single-sided graptolites. Near the base of the 
stem the nematophores may become biserial and opposite. Cauline nema- 
tophores are also situated, one on the axil of each pinna and one on 
the stem in the intervals between the pinnae. The sex of the gonan- 
gia could not be determined. The phylactogonium has a single bifur- 
cation close to its origin, and one of its branches again bifurcates. 
