FURTHER OBSERVATIONS ON THE BEHAVIOR OF 
TUBICOLOUS ANNELIDS! 
BY 
CHARLES W. HARGITT 
In a former contribution on the general subject above stated 
the present writer (’06)? described certain observations and experi- 
ments on several species of these interesting annelids. During 
the past summer these have been variously repeated and extended, 
and it is the purpose of the present paper to supplement the 
account given in the former by such additional facts as have been 
brought to light, and thus afford a more complete account of the 
behavior of these annelids than was made by the earlier contri- 
bution. The present account has to do with but one species, 
namely, Hydroides dianthus, except as there may be incidental 
occasion to refer briefly to others. 
The earlier observations were made entirely upon specimens 
kept in the aquarium. In the following account considerable 
emphasis will be placed upon observations made on specimens in 
their native habitat, and on the conclusions drawn from modes of 
behavior exhibited by tubes taken at various localities, and under 
greatly differing environments. It seems worth while to empha- 
size this point, as it is altogether probable that certain of our experi- 
mental results obtained from animals in cages, finger-bowls, etc., 
have given rise to more or less inadequate, if not misleading and 
erroneous conclusions. For example, it will be found in phases 
of the accounts which follow that the behavior of specimens taken 
from depths of ten to twenty fathoms shows considerable differ- 
ences as compared with that shown by specimens from shore 
waters, or from depths of two or three fathoms. Similarly the 
aspects of growth in specimens taken from rocky bottoms will 
1 Contributions from the Zodlogical Laboratory, Syracuse University. 
2 Journ. Exp. Zodl., vol. iii, p. 295. 
Tue JourNAL oF ExPERIMENTAL ZOOLOGY, VOL. Vii, No. 2. 
