50 CLADOCAEPUS 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 Acjlaophenia bicuspis* 



In the Cladocarpus paradisea of the present Report the gonangia are borne 

 exclusively on the sides of the phylactogonia ; while in C. doUcJiotheca 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. 



Trophosnmc. — Stem attaining a height of about an inch and a half, carry- 

 ing alternate pinnae for a short distance from its distal end, and with three 

 four or very oblique internodes just below the pinnate portion. Hydrothecos 

 widely separated from each other, deep, tubulai", 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. 



Gonosome. — Gonangia ovate, with a latero-terrainal orifice, borne on the 

 front of the stem, each one singly, close to the axil of one of the distal five 

 or six pinnfB, 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 racific Reef from .a depth of 283 fathoms. 



This is a remarkable and beautiful species. It is i-endered very striking 

 by its deep and widely separated hydrothecae, each overarched by that 

 portion of tlie 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. II., figs. 7 - 10. 



