lb und to conaist oi' a layer iii vnuch ccii outimes are not 

 distinp:tiishable , and in which the spherical nuclei lie as 

 in sincytium. The real sensory cells are the spindle- 

 shaped cells lyinc in the deeper part of the osphradiiim. 

 In the second place, Pelseneer (10) has described 

 the osphradiiom in Teredo and Pholas as innervated by a 

 nerve from the anterior ganglion, and the latter as con- 

 nected with the cerebral ganglia tlirough the connectives. 

 From this he concludes that the osphradia, as v;-ell as the 

 other organs of special sense, are innervated from the 

 cerebral ganglia. The organization of the nervous system 

 in Teredo, it seems to me, lends no evidence whatever to, 

 this view. The nerve fibres received from the connectives 

 by the anterior ganglion are quite lost in the latter and 

 cannot be traced into any of the nerves v/hich leave it. 

 Moreover, the anterior ganglion may with much more reason 

 be said to be connected witli the visceral ganglion, for 

 the branch of the so-called osphradial norve from it to 

 the latter, is much larger than the nervous elements re- 

 ceived by it from the cerebro-viaccral coni^ectives. Pel- 

 seneer seems not to have seen the other nerves that leave 

 the anterior ganglion. V/ith as much reason it might be 



