JELLY-FISH , ETC. 
485 
each arm a short stalk rises, the swollen end of which is beset with stinging- 
capsules. The very extensile mouth-tube moves about tentatively, and easily 
seizes upon the small crustaceans to be found upon the seaweed. Just above the 
base of each arm lies a horseshoe-shaped eye-spot containing a well-developed 
lens, but so far the nerve belonging to a true eye has not been discovered. 
Somewhat higher up, between every two arms, a bud is to be found. None of the 
Clavatella (a, magnified ; b, nat. size). 
specimens of a certain size examined in May were without their six buds, these 
being at such different stages of development that their gradual growth could be 
clearly traced. On the riper buds the rudiments of a second generation of buds 
were to be seen. Multiplication by budding has been observed in other medusae, 
and it is from such budding medusoid colonies that we may perhaps deduce the 
remarkable swimming colonies of the Siphonophora. As a rule, however, all 
medusae multiply sexually by means of fertilised eggs; even the Clavatella at 
other seasons lays eggs. 
Creeping medusae are also found in deep seas, although their presence at great 
depths would hardly be expected. Haeckel remarks that “ few animals appear 
less suited for deep-sea life than 
the medusae, with their soft, 
mucilaginous, watery bodies, 
and their singular methods of 
swimming; nevertheless, a few 
species sink down to great 
depths.” One of the most 
deep - sea life is the Pectis 
antarctica, belonging to the 
family of the Pectinidce. This 
animal is remarkable for its Pedis (nat. size), 
sucker-tentacles, which stand 
in numbers round the margin of the firm cartilaginous disc (these in the illustra¬ 
tion arc represented in a contracted condition). These tentacles bear a great 
interesting forms adapted for 
