524 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
this time the anterior edge of the funnel curves inwards, 
and so causes the funnel aperture to become almost 
completely closed (Pl. II, fig. Ta, f.cd.). In this sketch 
it will also be seen that the anterior mantle slit is now 
widely opened, to allow the water to pass inward (m.op.). 
Inspiration is accompanied by a slight movement upwards 
and backwards of the whole body. During expiration, 
the walls of the body contract again, as the amount of 
water contained in the mantle cavity becomes greatly 
diminished. This water is, however, bound to go out by 
the anterior funnel aperture (fig. 7b, f.op.), for this is 
now wide open while the mantle slit is tightly closed by 
the locking apparatus (fig. 7b, m.cl.). With expiration 
the body moves shghtly downwards and forwards. When 
a stream of borax carmine was passed in at the mantle 
aperture, during inspiration, it was passed out again as a 
red jet, from the anterior funnel opening, during 
expiration. *Thus the way the respiratory water passes 
was indicated. The stream of water thus ejected is sent 
out with great force, and disturbs the surrounding water 
for a considerable distance. There appears to be no 
constant rate of respiration. After a period of rest, say 
in the early morning in an aquarium, the rate is some- 
times as low as six per minute, while after agitation it 
increases to sixteen per minute. During the daytime it 
averaged twelve to fourteen. Smaller specimens appear to 
breathe rather more rapidly than larger ones. While 
resting, the tip of the funnel is generally seen protruding 
either from below the right or the left side of the 
body (Text fig. I). Every now and then Eledone 
changes the funnel over from one side to the other, and 
while so doing the respiratory movements slacken 
considerably. Often the body will be noticed to heave 
convulsively, and the respiration to quicken greatly, for a 
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