18 
On a Move of Repropuction by Spontaneous Fission in 
the Hyproipa. By Prof. Atuman, F.R.S. 
(Plate IT.) 
Tue hydroid which presents the remarkable mode of 
reproduction. about to be described was obtained in Loch 
Long, on the west coast of Scotland. It is a Campanularidan, 
profusely branched with its trophosome, bearing considerable 
resemblance to that of Odelia didiotoma, No gonosome, 
however, was present in any of the specimens collected; and 
though I believe that there are sufficient grounds for re- 
garding it as generically distinct from all previously described 
hydroids, its exact systematic position cannot, in the absence 
of a gonosome, be assigned otherwise than provisionally. 
It is in the possession of certain peculiar appendages—the 
morphological condition of the phenomenon which physiolo- 
gically distinguishes it from other hydroids—that I find the 
grounds for assigning to it a distinct generic rank. I would 
propose for it the name of Schizocladium ramosum, with the 
following diagnosis. 
Family—CAMPANULARID#. 
Genus—ScHIZOCLADIUM. 
Trophosome. — Hydrocaulus rooted, branching, carrying 
besides the hydranth-bearing ramuli others (fissiparous ap- 
pendages) which spring from various parts of the hydro- 
caulus, are of a cylindrical form, simple, and never give 
support either to a hydranth! or toa generative bud. Hydro- 
thecz with inoperculate orifice. 
Gonosome unknown. 
Name from oxiZw, to divide, and xAadiov, a branchlet. 
S. ramosum. 
(Pl. II, figs. 1 and 2.) 
Trophosome.—Hydrocaulus attaining a height of about an 
inch, much and irregularly branched, distinctly annulated at 
the origin of the branches and-for some distance from their 
distal extremities; fissiparous appendages equal to, or 
slightly surpassing in length, the hydranth-bearing ramuli, 
1 For reasons given elsewhere I use the term “ hydranth” to signify the 
proper alimentary zooid of the hydroid colony. 
