50 CLADOCARPUS DOLICHOTHECA. 
To the genus Cladocarpus I must also refer a Plumularidan dredged by 
Oscar Sars in the North Atlantic, and described by him under the name 
of Aglaophenia bicuspis.* 
In the Cladocarpus paradisea of the present Report the gonangia are borne 
exclusively on the sides of the phylactogonia; while in @. dolichotheca and in 
C. ventricosus they are borne only on the main stem, the phylactogonia 
arching over them so as to afford them protection in the manner of the 
leaflets of a corbula. In C. formosa of the Porcupine Report, the gonangia 
are borne both by the phylactogonia and by the main stem. 
Cladocarpus dolichotheca. 
Pl XXX: 
Trophosome. — Stem attaining a height of about an inch and a half, carry- 
ing alternate pinnz for a short distance from its distal end, and with three 
four or very oblique internodes just below the pinnate portion. Hydrothece 
widely separated from each other, deep, tubular, with the margin carrying 
a single long tooth in front, crenate in the rest of its extent; each hydro- 
theca overarched by the portion of the pinna which intervenes between 
it and the next above it; intrathecal ridge obsolete. | Supracalycine ne- 
matophores tubular, overtopping the hydrotheca; mesial nematophore not 
adnate to the hydrotheca, but springing from a point just below its base, 
where it forms a free tubular spine-like process with a long oblique slit-like 
orifice. ; 
Gronosome. — Gonangia ovate, with a latero-terminal orifice, borne on the 
front of the stem, each one singly, close to the axil of one of the distal five 
or six pinne, which become here more or less diminished in length, and 
carry each near its origin a dichotomously divided branch (phylactogonium) 
which forms three bifurcations, and arches over the front of the stem, and 
the gonangium there situated. 
Dredged off Pacific Reef from a depth of 283 fathoms. 
This is a remarkable and beautiful species. It is rendered very striking 
by its deep and widely separated hydrothece, each overarched by that 
portion of the rachis which intervenes between it and the next above it; 
the freedom of the mesial nematophore from the hydrotheca is also a well- 
* G. Oscar Sars, Bidrag til Kundskaben om Norges Hydroider. Forhandlinger i Videnskabs-Selskabet 
i Christiania, 1873, p. 98, Tab. IL, figs. 7-10. 
