118 
Mr. A. W. Waters on the 
spot in the centre. May these perform the same functions as 
the pore-tubes or the rosette-plates ? 
Hah. Scandinavia, Finland, and Spitzbergen, and all seas 
of Europe. 
43. Bugula fastigiata, L. 
Bugula plumosa , Pall., B.M. Cat. p. 45, pi. liv. 
Bugula avicularia, forma fastigiata, Smitt, Krit. Fort. Stand. H.-Bry. 
i867, p. 291, pi. xviii. figs. 16-18. 
44. Cellaria jistulosa, L. 
Salicornaria farciminoides, Ell. & Sol., Busk, Mar. Polyz. p. 16, pi. lxiv. 
figs. 1, 2, 3, pi. lxv. bis. fig. 5. 
Cellciria Jistulosa, L., Smitt, Krit. Fort. 6. Sk. Hafs-Bry. 1867, p. 362, 
pi. xx. figs. 18-20. 
For synonyms see Smitt and Reuss. 
Found in the Scandinavian seas and generally in Europe; 
also Algoa Bay ; and in Europe has been found in the Eocene, 
Miocene, and Pliocene. In Naples at all depths greater than 
10 fathoms. 
45. Tubucellaria cereoides , Ell. & Sol. 
Cellaria Michelim , Reuss, Foss. Pol. d. W. Tert. p. 61, pi. viii. 
figs. 1, 2. 
Onchophora tubulosa, Busk, Quart. Journ. Micr. Sci. 1855, vol. iii. 
p. 320, pi. iv. fig. 1. 
For a list of synonyms see Reuss, Foss. Bryoz. des Oest.-Ung. Miocans, 
p. 6; and see pi. xi. figs. 11-15, pi. xii. figs. 1, 2. 
The genus under its different synonyms has been sometimes 
described as having only one corneous tube to each new 
branch, which is not the case ; for sometimes several tubes 
grow out of the aperture of neighbouring cells, and from these 
are produced the basal cells of a new branch. 
The operculum (36* & 37*) in this species is very charac¬ 
teristic. It is suboval with a slightly flattened proximal end; 
near the sides are the muscular processes; the centre is lighter 
on account of there being a double chitinous layer over all but 
the centre ; width 0T3 millim., length 0'06. The operculum 
is situated at the bottom of the tubular peristome. 
In the apex of the subtriangular distal wall there is one 
rosette-plate near the centre of the zoarium. In the lateral 
walls there are four, two near the middle of the zoarium and 
two above, further removed. It is not without interest to find 
that in a closely allied species, T. hirsuta (Onchophora hir¬ 
sute, Busk, = Margaretta harhata , Hutton), there is a slight 
difference in both operculum and rosette-plates, by which they 
may be distinguished. 
