KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 51. N:o ll. 81 
polyp-bearing branches meet, a reduction always takes place in the number of the coelen- 
terons, and, consequently, the larger branches contain a smaller number of coelenterons. 
It must be maintained that this reduction is really identical with the disappearance of 
the coelenterons of the younger polyps. The coelenterons are very short and, in the larger 
branches, only the coelenterons of the older polyps remian. Generally those coelenterons 
disappear first — they are, too, the youngest — which are situated innermost, at the 
angle formed by the two branches that meet. This reduction takes place with the same 
number (one or two coelenterons) from each side. In the brancdes, of course, a reduction 
of the number of the coelenterons occurs on other occasions, too. When large branches 
meet, a reduction in the number of coelenterons also takes place on similar principles 
(Fig. 14). The large branches contain, consequently, coelenterons, which, later on, are 
again found in the smaller branches. Numerous changes take place in the situation of 
the coelenterons in consequence of these reductions. A great number of the coelenterons 
which are found in the smaller branches can be rediscovered in the larger ones, but it is 
difficult to trace them through the colony, on account of the change in the situation of 
the coelenterons. That there certainly is a difference in age between the polyps which 
are situated on the points of the branches is evident from what has been stated, even if it 
is difficult to decide in each case which of the polyps is the oldest. By carefully tracing 
the respective coelenterons right up into the smaller branches, it would seem as if those 
polyps that are placed outermost on every branch are oldest, although, in consequence 
of the method of ramification, they have received the same position as others on the same 
branch. It is impossible to discover in the coelenterons of the terminal polyps a direct 
connection of the coelenterons formed earliest, as the oldest coelenterons disappear at a 
relatively early period. 
The umbellate and partly dicotomical exterior ramification is not accompanied 
by a corresponding regularity in the interior parts and in the canal system. These 
changes in position of the respective coelenterons have been the cause of the beautiful 
development of the indirect canal system in this species, as, naturally in consequence 
of the changes, the space between the coelenterons has become better arranged and the 
smaller branches, too, have retained good development of coenenchym. 
The specimens of Eunephthya rosea which have been obtained in Baffin Bay and on 
the west coast of Greenland differ from the North Sea forms in their possession of a more 
powerful anthocodia armature. They have, too, minor colonies, with short, powerful 
Pranehes: (PE IT figt21.) 
Habitat: 
Baffin Bay, Lat. 68? 8 N., Long. 58” 47 W., 304 met., stones and clay (Ingegärd 
and Gladan, 2/, 1781), 3 sps.; Lat. 72? 32 N., Long. 58” 51' W., 259 met., stones (Inge- 
gärd and Gladan, "/, 1781), 1 sp.; Lat. 76” 26! N., Long. 67? 27 W., 468 met., hard clay 
with stones (Sofia exp., ?”/, 1883), 3 sps. 
Norwegian Sea, 300—540 met. (UGGLA), 1 sp. 
Norway, Storeggen, 125—-300 met. (V. YHLEN), 1 sp.; Trondhjem Fiord, 1 sp. 
K. Sv. Vet. Akad. Handl. Band 51. N:o 11. 11 
