38 
LIFE, IN ITS LOWEB FOKMS. 
two lakes of equal dimensions. Sometimes the whole 
bladder wrinkles and partially collapses into a rugose 
column, and then slowly distends again, when the open- 
ings are seen as they were before 
“ The efferent stream pours out at each of these orifices, 
carrying with it fecal matters from the interior, and any 
light-floating atoms that may be in the vicinity, as I saw 
with beautiful distinctness, by making the surrounding 
water slightly turbid. 
“ On my touching the bladder with the point of a needle, 
it at once shrank up into a wrinkled column, but did not 
retract, and presently distended again. Thus the specimen 
exhibited very distinctly those characteristics of animal life 
— sensibility to touch, and spontaneous movements.” * 
* Tenby, 320. 
