1916. ] R. E. Luoyvp: Campanulina ceylonensts. 55 
apparently obtained no nourishment helped to subdue the strug- 
gles of the victim. A yellowish granular stream, the blood and 
coelomic fluid of the worm was seen pouring slowly into the two 
hydroids which were attached terminally. The enteron of the 
hydroids became considerably expanded for a short distance below 
the tentacles and this expansion was no doubt the means of suction. 
A lesser expansion at this point is frequently visible even in the 
resting condition (plate v, fig. 1). The nourishment was not re- 
tained by the hydroids but passed on rapidly into the general 
coenosare of the colony. Within five minutes from the com- 
mencement of the operations, the stems of the hydroids which 
remained extended throughout had regained their usual glassy 
appearance. The body of the worm, motionless and shrunken, 
was released in less than five minutes after capture. 
The Gonosome. 
The gonosome was found in various stages of development 
(plate vi). Although the series illustrated is not complete the 
earliest and later stages are well represented. In the iatest the 
young medusa can be seen lying within the gonotheca provided 
with tentacles and sense vesicles. Although the manubrium is 
still imperforate, the medusa is evidently almost ready to be liber- 
ated. As estimated from the drawing to scale, the convexity of 
the bell of the medusa lying within the gonotheca measures about 
‘7 mm. in the specimen figured The diameter of the bell in the 
smallest medusa caught swimming freely was at least 2 mm. 
There is therefore an interval in the life-history including the liber- 
ation of the medusa and the first part of its free life which was 
not observed. 
There are usually two medusae in each gonosome, a proximal 
and a distal, the latter being always the more developed. Some- 
times only one medusa occurs which probably represents the prox- 
imal member of the pair after the liberation of the distal mem- 
ber. About 1 in 5 of the mature gonosomes were in this con- 
dition. 
The gonosome of Campanulina was described by Hincks as 
growing from the stolon and containing one medusa. In this 
species, however, the gonosome usually grows from the base of a 
hydrosome and contains two medusoid buds. 
In its earliest puuse the gonosome appears as a tubular out- 
growth from the coenosarc which sometimes arises from the main 
stolon but more often from the intermediate branches near the 
base of the hydrosome. This tubular outgrowth is a blastostyle 
which gives rise to the two medusae by budding. Before any 
buds have appeared upon it, the blastostyle has a characteristic 
appearance. It is, we have seen, a tubular outgrowth of the 
coenosare and throughout most of its length it appears to have 
the same structure as the coenosarc of the stolon, the cells of both 
ectoderm and endoderm being opaque and finely granular. Close 
to the extremity, however, the cells have a different appearance, 
