The Invertebrate Kidney. 
134 
Proceedings of Royal Society of Edinburgh. [sess. 
12 3 
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* In some forms an organ has a dual, triple, &c., function (see Darwin’s Origin of Species, chapter vi.). 
f Memoir on the Pearly Nautilus, by Sir Richai’d Owen, K.C.B., F.R.S. 
t Weinland has found guanin in the excrements of spiders (Zeit. Biol., vol. xxv. p. 390). 
