(106) 



nerve fibers. The descriptioi: is brief so 1 am "not able 

 r iio t 

 to say whether the eani^lion that he speaks o^ represents the gan- 

 glion that Kov/alevsky (11) and Cori (4) ciescribe. 



Benham (2) finds no gan£:lion in P. Australis but describes 

 two small areas wl:ich, it seems probable, are the same as Cald- 

 well's "ciliated pits". He is the first to recognize the ex- 

 istence of a lateral nsrve on the rij^ht side as v;ell as on the 

 left, and he finds a nerve ring with a nerve to each tentacle 

 arising from it. 



Cori (4) describes a definite gaiiglioii, a lateral nerve 

 on the left side only nd tentacular nerves. Ke is the first 

 and only investigator who has published anything on the distrib- 

 ution o^ the nervous tissue in the lophophoral orga^i, 



Andrews (1), Torrey (22) and Ikeda (9) have given very 

 brief descriptions of the nervous system but the t vvo former rec- 

 ognize the existence of a short lateral nerve on the right side 

 as well as a long one on the left side, v/hilo the latter speaks 

 of a so-called brain ganglion and nerve ring. 



The account which Andrews gives of the nervous system of 

 P. architecta is ver-j brief since his paper only deals v/ith the 

 description of a new species. Ke only speaks o^ the lateral 

 nerve and makes no mention of a brain ganglion, ring nerve, ten- 

 tacular nerves ox nerves to the lophophoral organ. 



