Lectures on the comparative anatomy and physiology of the invertebrate animals : delivered at the Royal College of Surgeons . 458 LECTURE XIX. rest, and connected, in Calamisfrum, with a kind of comb attachedto the metatarsus of the hind legs. Six, however, is the ordinarynumber of spinnerets in the spiders, two of which are longer thanthe others. The secretion does not issue by a simple outlet, but bya multitude of microscopic pores (Jig. 171), ^^^ which, in the shorter pairs of spinnerets, areprolonged from the terminal surface upon minuteprocesses. If you throw a little dust upon
Lectures on the comparative anatomy and physiology of the invertebrate animals : delivered at the Royal College of Surgeons . 458 LECTURE XIX. rest, and connected, in Calamisfrum, with a kind of comb attachedto the metatarsus of the hind legs. Six, however, is the ordinarynumber of spinnerets in the spiders, two of which are longer thanthe others. The secretion does not issue by a simple outlet, but bya multitude of microscopic pores (Jig. 171), ^^^ which, in the shorter pairs of spinnerets, areprolonged from the terminal surface upon minuteprocesses. If you throw a little dust upon theweb of any of the orbitele spiders, of the Epeiradiadema for example, you may observe that itadheres to the spiral, but not to the radiated,threads; for the spiral thread is beset with minuteviscid globules. Lyonnet supposed that the ad- uppeT s^T^ret. hesive threads issued from the tubular, and the egenauaavt is. others from the sessile orifices. The secretion is a glutinous fluid,insoluble in water, and quickly drying in air ; some species, as Ar-gyroneta aquatica^ spread their nets habitually under water. The decree and mod
Size: 1564px × 1598px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorowenrichard18041892, bookcentury1800, bookdecade1850
