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od. H. Emerton—Cobwebs of Uloborus. 203 
ArT. XXI.— The Cobwebs of Uloborus; by J. H. EMERTON. 
IN a recent article on the cribellum and calamistrum 
(Archiv fiir Naturgeschichte, 1882), P. Bertkau has cleared up 
the uncertainty about the structure of the cribellum by finding 
again the secreting glands at the ends of the fine tubes which 
have their outlets in this organ. Like Blackwall, Bertkau 
places together in one group all the spiders which are provided 
with the cribellum, instead of dividing them among several 
families according to their form and habits, as has been done 
'y more recent writers. One of the principal reasons for this 
division has been the supposed resemblance of the webs of 
Hyptiotes, and especially of Uloborus, to those of the Hpeiride, 
