219 
RS: Måler, C. — Einige Fålle von Doppelbildung und Concrescenz bei 
2. 
Hydroiden. — Zoolog. Anzeiger. Bd. 42. pp. 104—11 
1913. Will, L. — Der Einfluss des Hungers auf die Hydroiden und seine 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig, 
ma 
. 
N 
% 
beg 
kausale Beziehung zum Polymorphismus. — Sitzungsber. u. 
dl. E Naturforsch. Gesellsch. zu Rostock. Bd. V. 
pp: 33—56. af. 
Explanation of Plate III. 
Branch of Laomedea geniculata with three frustules in various stages 
of development. — In a the coenosarc nearly fills out the perisarc. 
— In b the thread is somewhat longer, and the middle part of re 
Coenosarc is thin and not connected with the perisarc. — In e 
distal part of the coenosarc is sS separated from the proximal mM ke 
frustule has still a thin proximal part, a tail. 
A frustule of L. geniculata men before the moment of deliberation, 
rounded in both ends, but still resting within the unbroken tube 
20 
A frustule of Laomedea longissima, still connected with the coenosarc 
of the branch. X 48. 
Å frustule of S. Iongissima with a young hydranth. Showing the 
vertical wall separating the "chamberf from the open chitinous tube. 
x 48 
Another frustule of the same species. — The coenosarc of the cham- 
ber has partly been drawn up into the pedicel of the developing 
h 48 
Å primary stolon of a frustule of L. longissima with the marks of 
two pedicels of hydranths (cut off) and with a secondary lateral 
stolon. x 48. 
