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to the larce , duct-like portions of the genital organs. 

 But before entering the visceral ganglia, they pass dorsal 

 to a sraall "anterior ganglion" •./nich li t in front of 

 the latter. In passing it , they lose a Si . lount of 

 nerve fibres (fig. 63), v/hich are lost in it. Then the 

 connectives enter the visceral ganglia, but little dimin- 

 ished in size. This anterior ganglion '.vas first described 

 by Pelseneer (13) for the "Ship-worms" and seems peculiar 

 to them and their allies. It is a small ganglionic mass 

 lying distinctly in front of the visceral in well preserv- 

 ed specimens, and from the fibres crossing between the sids; 

 it seems composed of two halves, quite completely fused 

 together. As has been stated, the connectives in passing, 

 send fibres ventrally into it, to be completelj'' lost in 

 it. From this ganglion several pairs of nerves are given 

 off which innervate tho kidneys and other viscera, the gen- 

 ital papillae and the osphrodium, at least in part (fig. 

 60). From the anterior end, a pair passes forwards to sup- 

 ply the genital organs and perhaps other viscera. From 

 the middle of the ganglion a pair passes laterally to in- 

 nervate the genital papillae and the kidneys (fig. 63). 

 Leaving the posterior lateral angles of the ganglion, the 



