The Shipley Collection of Scientific Papers, Volume 1141880 |
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... spinnerets and anal lobe are shown as five papillæ in Pl . XIX , fig . 9. Dor- sally the heart is now very conspicuous , and in front of the cheliceræ may be seen the supra - oesophageal ganglia . The indifferent mesoblast has now to a ...
... spinnerets and anal lobe are shown as five papillæ in Pl . XIX , fig . 9. Dor- sally the heart is now very conspicuous , and in front of the cheliceræ may be seen the supra - oesophageal ganglia . The indifferent mesoblast has now to a ...
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... Spinnerets . st . Stomodæum . I - IV . Ambulatory appendages . 1-16 . Postoral segments . FIG . 1. — Ovum , with primitive cumulus and streak proceeding from it . FIG . 2. - Somewhat later stage , in which the primitive cumulus is still ...
... Spinnerets . st . Stomodæum . I - IV . Ambulatory appendages . 1-16 . Postoral segments . FIG . 1. — Ovum , with primitive cumulus and streak proceeding from it . FIG . 2. - Somewhat later stage , in which the primitive cumulus is still ...
Página 30
... spinnerets ( a ) is filled by a small tongue - like process ( t ) . The wider gap separating the posterior ( or superior ) spinnerets ( p ) is occupied by a terminal projection of the abdomen ( 2 ) containing the anus . Each of these ...
... spinnerets ( a ) is filled by a small tongue - like process ( t ) . The wider gap separating the posterior ( or superior ) spinnerets ( p ) is occupied by a terminal projection of the abdomen ( 2 ) containing the anus . Each of these ...
Página 31
... spinneret . There are three pairs of Tubuliform glands , two opening on the inner side of the posterior spinnerets , and one upon the outer surface of the intermediate spinnerets . The above glands are comparatively large , and their ...
... spinneret . There are three pairs of Tubuliform glands , two opening on the inner side of the posterior spinnerets , and one upon the outer surface of the intermediate spinnerets . The above glands are comparatively large , and their ...
Página 33
... spinnerets must be kept forward by a gentle strain on the thread , and the pos- terior spinnerets thrust aside with a needle . The new lines may then be traced to the intermediate spinnerets , and proceed from large spinning tubes on ...
... spinnerets must be kept forward by a gentle strain on the thread , and the pos- terior spinnerets thrust aside with a needle . The new lines may then be traced to the intermediate spinnerets , and proceed from large spinning tubes on ...
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Página 61 - ... illustration, which we have only to go into the garden to find. There we may see in abundance what is now upon the screen — the webs of those beautiful geometrical spiders. The radial threads are smooth, like the one you saw a few minutes ago, but the threads that go round and round, are beaded. The spider draws these webs slowly, and at the same time pours upon them a liquid, and still further to obtain the effect of launching a liquid cylinder in space, he, or rather she, pulls it out like...