203 
surinamensis (Semper); he expressly States that „they are always 
fewer on regenerating buccal ends, than in the normal individual, 
where they are twenty in number“. It does not appear from this 
statement whether these specimens, even when fully regenerated, 
do not attain to the full number of tentacles which would however 
hardly seem probable. Torel le (1919, p. 19) has found that in Cucu- 
maria Grubei Marenz. the full number of tentacles is regenerated. 
It is thus evident that the development of the tentacles in the 
specimens regenerating the anterior end is different from that of 
the normal embryological development, where the rule is that first 
5 tentacles appear, the rest following later on, apparently in a 
definite order (Edwards 1909). The development in the regen¬ 
erating specimens is accordingly more summary. 
During the development of the ten last tentacles, the pedicels 
and papillæ make their appearance as small points on the surface of 
the skin and gradually assume their normal shape. They appear 
in very distinet, longitudinal rows. At the same time the tentacle- 
collar is formed. — The regeneration of the anal end proceeds in 
a way very similar to that of the oral end. In the youngest stage 
there is no anal opening, the specimen having a simple end (Fig. 
2). As regeneration goes on and a new posterior part grows out, 
a small anal opening is formed, then pedicels and papillæ appear, 
and finally small calcareous anal teeth are developed. 
Internally the regeneration is especially remarkable as regards 
the longitudinal musclebands, which always look as if they had 
been cut in two. The old muscleband is ending in a somewhat 
swollen knob, at some distance from the place where the division 
has taken place, on account of the contraction due to the muscle- 
tonus. The new musclebands are always more siender and delicate 
than the old non regenerated ones (Figs. 2—3). In the cases 
where the oral end was closed, the intestinal gut was found to end 
blindly, hanging free in the dorsal mesentery, and all the organs 
surrounding the mouth were absent, even the new musclebands 
were not developed. In all the 10 tentacled stages dissection showed 
that the mouth was in communication with the old gut, and a calc¬ 
areous ring was formed, very thin and fragile. The ten first tent- 
acle ampullæ were present as ten small buds, of equal size and 
