(41) 



without any difftculty v/hen brought into tiie laboratory yet I 

 have never been able to inauce Actinotroctia Species, B. , to do 

 so. I have kept specimens for ten day a or luo re (the pouc>i and 

 blooa corpuscles bein.:; v/ell develcpea) and in some cases they 

 succeeded in evaginatih;-; the ventral pouch but ti.cy were iiever 

 able to complete th.e metaiTiorphosis, 



As far as I know the aarlt of this Actinotrocha has never 

 .en ^ound but I think it probable that it lives under quite dif- 

 ferent conditions frora PhcTDnis architecta and 1 should not be 

 surprised i f it were found to be a deep-water form. 



Tn ternal Organi zation of >_he_ "Pu lly D eveloped A cting tro ci.a. 



"Su bneura l Gland" ;- (Masteraan) Masterinan (lo) has de- 

 scribed a depression in the dorsal wall of the buccal cavity 

 vdiich he terrts a "snbnoural Qld.XiO." and which he compares v/i th 

 the glariO of tne same name in the Tunicata and also possibly 

 ••-i ti-. the hypophysis of the Vert eb rat a. 



Roule (^0) and Ikeda (9) are of the opinion that this de- 

 pression is a pf'oduct of the fixin^ method. 



Lohi^champs (12) does not consider it to be an accidental 

 structure but lie does not aj^ree witn Masteniian's view as to its 

 tiieoreti cal si ,,ni ficaix e. 



I'^enon (17) says that the "subneural £-,land" nrst appear o in 

 connection with the collar ana that durinj development, it shi-^ts 



