326 SIR SIDNEY F. HAEMBR ON 
Type 3 (fig. 3). — The split extends nearly to the proximal end o£ the 
axillary zooecium, E, which is accordingly free, on its inner side, for the 
greater part of its length. E gives off a connecting process (c.p.) to meet 
the proximal end of F. In the species figured, each of the pairs E, C and 
F, D has a single fork, at the proximal end, divided by the common septal 
wall in such a way that each of the four zocecia has only a half fork, Instead 
of a complete fork as in the other zooecia. — Bugula jolmstonce (Gray), 1843, 
and other species of this genus. 
Type 4 (fig. 4). — The split does not extend proximally so far as in type 3, 
not more than half the axillary zocecium (E) being free on its inner side. 
The connecting process {c.p.) is given off by F, and joins the inner lobe of 
the fork of G, which crosses the basal side of E. — Species of Bvgula, e. g., 
B. scaphoides, Kirkp., 1890, A. M. N. H. (6) v. p. 18, and Bicellariella, and 
most of the species of Stirpariella, e. g., S. zanzibariensis, Waters, 1913, 
P.Z. S. p. 469. 
Type 5 (fig. 5). — The axillary zooecium is almost completely immersed in 
the parent-internode, the split only reaching its distal end. The connecting- 
process (c.jw.) is given off by G and joins the inner lobe of the fork of H. — 
Species of Bugula, e. g., B. dentata (Lamx.), 1816, p. 135, and of Stirpariella, 
e.g., S. caraibica, Levinsen, 1909, p. 104. 
Type 6 (fig. 6). — Although F is in contact with B, it appears to be derived 
'from E, which it meets near the middle of the length of the latter. The 
connection between the proximal ends of the inner zooecia of the branches is 
formed by the independent junction of F and G with E. The proximal ends 
of the zocecia are not bifurcate. Oblique joints, indicated by dotted lines 
and of a type common in Bugula, traverse the zooecia. — Euoplozoum cirratum 
(Busk), 1884, p. 17. 
Type 7 (fig. 7). — Resembles type 6 in the relation of G and F to E, but is 
peculiar in other respects. The axillary zooecium (E), which gives rise to F 
and G, passes into the proximal end of the branch on the side opposite to A, 
a relation which has not been found in any other type. B takes no part in 
the doubling of the number of zooecia, the proximal ends of which are not 
bifurcate. — Kinetoskias cyatlms and all the other species (4) examined. 
In the following types (8-18) the position of the chitinous joints is of 
importance. 
Type 8 (fig. 8). — The proximal segments of F and G are in contact on the 
basal side of E, and are shorter than the corresponding parts of C and D ; 
the joints traversing F and G near their proximal ends, and passing much 
more distally through and D. In the species figured [Scrupocellana ferox, 
Busk, 1852), the joint traverses the middle of the opesia, which is represented 
by dotted lines, of each of the outer zooecia C and D. In certain other 
