CELLULARINE AND OTHER POLYZOA. 327 
species of the genus each joint passes across the proximal end o£ the opesia 
of the outer zooecium ; and in others^ particularly in those with elongated 
zocecia, it passes entirely on the proximal side of the opesia of C and D. — 
Scrupocellaria, all species. Himantozoum may be considered to belong to 
this type, with which it agrees exeept that it is unjointed. 
Type 9 (fig. 9). — The proximal segments of F and G are not in contact, 
and are shorter than the corresponding parts of and D ; the joints 
traversing CGr and DF respectively. A rootlet-chamber occurs on the 
proximal segment of C or D, or of both, and the rootlet is thus given off on 
the proximal side of the joint. — Tricellaria, spp. 
Type 10 (fig. 10). — The proximal segments of F and Gr are separated by 
the whole width of E, and the two bi-anches come off at different levels, that 
•on the side of A being the more proximally situated. Internodes commonly 
composed of three zooecia, G and D then taking on the character of A and B 
zooecia in the next internode. — Tricellaria, spp. (Figured specimen, 2. occi- 
■dentalis var. dilatata, Ortmann, 1889, p. 21.) 
Type 11 (fig. 11). — Except in the fact that the proximal segments of F 
;and G are in contact, this agrees with type 9. — Tricellaria peachii (Busk). 
Type 12 (fig. 12) . — Readily derivable from type 10 hj the suppression of 
the proximal segments of F and G, the internode thus consisting of a single 
zooecium at its proximal end, connected with its predecessor by a single 
chitinous joint. — Tricellaria aculeata, D'Orb. 
Type 13 (fig. 13). — A modification agreeing with type 12, occurring in 
Emma cyathus. The zooecia C and D take on the character of A and B 
zooecia at their distal ends. 
Type 14 (fig. 14). — Internodes composed of three zooecia and, like the 
.zooecia, very short. A slight modification of type 9. — Emma, spp. 
Type 15 (fig. 15). — Proximal segments of F and G in contact, much 
longer than the corresponding parts of J and K. The joints are on the distal 
-sides of and D, and traverse the zooecia FJ and GK. The joints are 
situated at some distance from the axil, instead of being on the same level 
with it, and do not traverse the opesia of any zooecium. Rootlets given off 
on the distal sides of the joints. — Notoplites. A modification represented, m 
■the same genus, in the 'Siboga' Collection results from the suppression of one 
of the joints of the bifurcation. 
Type 16 (PI. 17. fig. 16). — The axillary zoopcium is free on both sides 
distally. The zooecia F and G are not in contact with one another, but each 
is connected with one side of E at a point marked by the presence of a con- 
spicuous rosette-plate (r.p.). — Cornucopina, all species examined. The 
-zooecia are very long, and a constriction partially separates a small proximal 
.section from the main part of the zooecium. 
24* 
