332 THE ANATOMY OF INVERTEBRATED ANIMALS. 



distinct, and the testes and ovaria are lodged in the legs and 

 open upon their basal joints. 



Fig, ^l.—AmmotTiea pycnogonides, female (after Quatrefage?).— a, cesopliagns ; <f, 

 antennae ; &, etomach witU its prolongation into the antennae and limbs e • c, 

 rectum. 



Tlie embryo emerges from the egg as a larva provided with 

 a rostrum, and with three pairs of appendages, which repre- 

 sent the short, anterior three pairs in the adult/ The four 

 pairs of great limbs of the adult are produced by outgrowths 

 from a subsequent posterior elongation of the body. 



The comparison of the embryos of the Pycnogonida with 

 those of the Acarma, especially such as leave the egg with 

 three pairs of appendages, appears to me to leave little doubt 

 that the rostrum of the larva Pycnogomnn is formed, as in 

 the Mites, by the coalesced representatives of the chelicerre 

 and pedipalpi. If so, the seven other pairs of limbs are, by 

 three pairs, in excess of the number found in any Arachnidan. 



^ A. Dohm, " IJntersucbungcn liber Bau und Entwickelung der Artbro- 

 poden." Erstes Heft. 1870. 



