Insect artizans and their work . heir arrange-ment, or it will capture small water-snails, chieflyspecies of Planorbis, but often the little freshwaterbivalves (Spk&rium), in either case with the shellstill tenanted by its builder. Such a dress ofliving molluscs is apparently cumbrous by reason ofits weight, so we often find that the tailor hasredressed the balance by fixing along each side ofhis tube a bit of stick perhaps twice its gives the required buoyancy, though notsufficient to float the structure. Anabolia nervosa,which makes its case of small fragments of stone,adopts the
Insect artizans and their work . heir arrange-ment, or it will capture small water-snails, chieflyspecies of Planorbis, but often the little freshwaterbivalves (Spk&rium), in either case with the shellstill tenanted by its builder. Such a dress ofliving molluscs is apparently cumbrous by reason ofits weight, so we often find that the tailor hasredressed the balance by fixing along each side ofhis tube a bit of stick perhaps twice its gives the required buoyancy, though notsufficient to float the structure. Anabolia nervosa,which makes its case of small fragments of stone,adopts the same method for lightening it. Seri-costoma and Setodes make their cases of sand, veryneatly spread over the silk lining, slightly taperingand curved. Setodes is in form exactly like themarine shell known as the tusk shell (Dentalium). These cases, carefully examined, will be foundto be broader at one end than at the other— andthereby hangs a tale. The Caddis Worm, as theadvance of life causes it to increase both in girth.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsects, bookyear1919
