244 
THE OCEAN WORLD. 
The nursing polypes have been called poboscidiferous organs by 
Mr. Milne Edwards, who has studied them carefully. They are 
rendered conspicuous at a glance by the bright red colour of their 
digestive cavity and their extreme dilat, ability. At the base of their 
; , stems the very delicate fila- 
ments called fishing-lines 
are 
st'Ji 
attached, which are furnished 
with a multitude of stinging 
tendrils of a reddish colour. 
These tendrils slightly re- 
semble those of the Agalmae, 
and the sabre -like weapons 
are not wanting. 
Between the nursing poly- 
pes are placed in pairs the 
reproductive’ individuals, hav- 
ing the form of an elongated 
tube very dilatable, and closed 
at the free end. They have, 
then, no mouth ! Milne 
Edwards calls these “ vesicular 
appendages,” and M.Kcelliker, 
tentacles. The buds arranged 
at the base of each prolific 
individual vary ; but, accord- 
ing to M. Yogt, they are al- 
ways there in pairs— a male 
and female at the base of 
each stem. Figs. 99 and 100 
represent the colony we have endeavoured to describe, 99 being the 
nursing individual of Apolemia contorta magnified twelve times, 100 
representing the reproductive pair under the same magnifying power. 
Fig. 99. Apolemia contorta, 
magnified 12 times. 
Fig. loo. Apolemia con- 
torta, reproductive 
pair, magnified 12 times. 
The Diphyd®. 
We have seen that the Physophora, the Agalma, and the Apolem ■«* 
have for the use of the colony a vast number of swimming vesicules 
