12 GEORGE BUSK. 
the circumstance that occasionally the lateral tube may be 
seen terminating in a rounded extremity, not at the con- 
stricted base of the zocecium as usual, but at about the 
middle of its length, being, as it were, simply applied, like 
ivy to a wall, and without entering the zoecium. In most 
cases, however, the radical tubes may be seen entering or 
emerging from the usual point at the base of the zowcium. 
The inter-connection of the branches of a ramose zoarium 
by transverse tubes of the same nature as radical tubes is of 
common occurrence in more than one family of Polyzoa. 
As instances may be cited, among the Cabereide, the well- 
known Canda arachnoides with which I think the Caberea 
(or Canda) reticulata of Smitt! should be associated as a 
variety, whilst in the genus Bugula the occurrence of such a 
condition may be observed in several species. Of these I 
would more particularly notice two as yet undescribed forms 
in the Challenger collection, which I propose to name 
Bugula reticulata (fig. 7) and Bugula unicornis (fig. 8), in 
which this mode of connection is very well displayed; but 
in both these instances, as well as in Canda arachnoides, the 
connecting tube is distinctly seen to arise from a zoecium 
in one of the branches, and to be attached to the other 
branch by means of clasping fibres, or by an expanded disc, 
obviously in this respect resembling a common condition in 
the radical tubes. In this respect, therefore, differing from 
the apparent condition of the transverse connecting tubes in 
Kinetoskias pocillum. 
In a third species of Bugula, also,as yet unpublished, 
which I propose to name Bugula mirabilis, although 
there are no connecting tubes between the branches, the 
-mode in which the radical tubes are collected into a long, 
rope-like peduncle, shows a complete analogy with, or 
approach to, the assumed mode of origin of the peduncle in 
Kinetoskias. In fig. 6 is represented the terminal portion 
of the zoarium of B. mirabilis, composed, as will be seen, of 
a bundle of tubes arising from the usual point in the lower 
zocecia, and assembled into a close fasciculus, in which some 
of the tubes, in fact, may be seen in such intimate union as 
to render it uncertain whether their Jumina are not con- 
fluent. The branching terminal portion of one of the radi- 
cal tubes is shown subdividing into slender-jointed filaments, 
each of which, as in Avmetoskias and many other radicellate 
forms, is attached individually to a foreign body; and the 
figure also shows the segmented condition of the tube and 
filaments. 
1 ¢ Floridan Bryozoa,’ p. xvi, pl. v, figs. 43-—46, 
