The Shipley Collection of Scientific Papers, Volume 1141880 |
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... abdomen of the young Spider is found to be bent over so as to press against the ventral surface of the thorax ( Pl . XIX , fig . 9 ) . This flexure is shown in section in Pl . XXI , fig . 21 . At the earliest stage of this period of ...
... abdomen of the young Spider is found to be bent over so as to press against the ventral surface of the thorax ( Pl . XIX , fig . 9 ) . This flexure is shown in section in Pl . XXI , fig . 21 . At the earliest stage of this period of ...
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... of the embryo . In the dorsal region of the abdomen the heart has already become established . So far as I have been able to make out it is formed from a solid cord of the NOTES ON THE DEVELOPMENT OF THE ARANEINA . 15.
... of the embryo . In the dorsal region of the abdomen the heart has already become established . So far as I have been able to make out it is formed from a solid cord of the NOTES ON THE DEVELOPMENT OF THE ARANEINA . 15.
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... abdomen three or four transverse septa , derived from the splanchnic mesoblast , grow a short way into the yolk . They become more conspicuous during the succeed- ing stage , and are spoken of in detail in the description of that stage ...
... abdomen three or four transverse septa , derived from the splanchnic mesoblast , grow a short way into the yolk . They become more conspicuous during the succeed- ing stage , and are spoken of in detail in the description of that stage ...
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... abdomen , and the constriction separating the thorax and abdomen has began to appear . The yolk sack has become ab- sorbed , so that the two halves of the ventral plate in the thorax are no longer widely divaricated . The limbs have to ...
... abdomen , and the constriction separating the thorax and abdomen has began to appear . The yolk sack has become ab- sorbed , so that the two halves of the ventral plate in the thorax are no longer widely divaricated . The limbs have to ...
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of the abdomen . In the first place they send off lateral off- shoots , which unite the various septa together , and divide up the cavity of the abdomen into a number of partially separated compartments . There appears , however , to be ...
of the abdomen . In the first place they send off lateral off- shoots , which unite the various septa together , and divide up the cavity of the abdomen into a number of partially separated compartments . There appears , however , to be ...
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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...