4 
THE VOYAGE OF H.M.S. CHALLENGER. 
or less extent to the body of the hydranth, and does not form as in a true hydrotheca 
a detached receptacle from the walls of which the hydranth is entirely free. 
The gonophores are borne singly on rather long peduncles which spring from the 
sides of the branches, at variable distances below the hydranth. Though the opacity of 
the perisarcal clothing of the gonophores rendered it impossible to determine the nature 
of their contents with sufficient certainty to remove all doubt as to their sex, we may 
safely assume that like similar bodies in other species of Eudendrium they enclose ova, 
the male gonophores in Eudendrium, so far as has been hitherto observed, differing from 
these in form and arrangement. 
The perisarc, not only in the trophosome but in its extension over the gonophores, is 
of a dull brown colour, and is so opaque that a view of the included parts cannot be 
obtained through it. In these respects, as well as in the long-peduncled oviform 
gonophores distributed along the ultimate ramuli, Eudendrium vestitum forcibly recalls 
the general facies of Bimeria vestita; from which, however, it is separated by the form 
of its hypostome, which presents the condition of a distinctly differentiated trumpet- 
shaped appendage characteristic of Eudendrium, instead of being a simple fusiform 
extension of the hydranth as in the Bimeridse. 
Eudendrium rameum (Pallas) (PL II. figs. 1, 2). 
Tubularia ramea, Pallas, Elenchus, p. 83. 
Eudendrium rameum, Johnston, Brit. Zooph., p. 43, 1847. 
Trophosome. — Hydrocaulus profusely and for the greater part of its extent very 
irregularly branched, main stem and principal branches strongly fascicled, but becoming 
monosiphonic distally where the irregular ramification gives place to an alternate 
disposition of the ramuli ; monosiphonic ramuli with several distinct annulations at their 
origin, and often with one or more groups of annulations at variable distances along their 
length. Hydranths with about sixteen tentacles. 
Gonosome not present. 1 
Locality. — Station 149j, off Cumberland Bay, Kerguelen Island; depth, 105 fathoms. 
I can find no character which would justify the separation of the Hy droid which has 
afforded the subject of the description here given from the Tubularia ramea of Pallas = 
Eudendrium rameum of Johnston, a species by no means rare on the British coast. It is 
true that no gonosome is present in the Kerguelen specimen, and the want of this essential 
part of the colony renders the identification of the species less certain than it would 
otherwise be. In the absence, however, of any character inconsistent with the determina- 
1 In the gonosome, as observed in British specimens, the male gonophores are- two-chambered, borne on the body 
of the hydranth in a verticil immediately below the tentacles ; the female are oviform, scattered on the hydrocaulus for 
some distance below the hydranth. 
