(59) 



Ikeaa (9) x.as described a pair o "" buiidlea of inn.scle fibers 

 B-pririt.iiif, f-'"om "ttvc iiiiia lateral coriicrt of ti:e ^aiiijlioii aud 

 rTJUiiiiii, divergently aovnr.vard until they insert t he rri-y elves in the 

 collar walls tetween ti:e -f"irst aiid secona teiitacles". These 

 im'scles, to which he has triven tno name of "retractors", are 

 present in the Actino tro chao Species, A., ana Species, E. ('Pit.s. 

 34_35-45-45(a) ) 



The "retractors" tr.at Ikeaa fij^ures in the trunk cavity of 

 one of tie Japanese ActJ no troc r.ae 1 am unable to -^ind in either 

 Actinotrocha Species, A., or Species, E. 



Another pair of bundles of muscle fibers is fbuna in Spe- 

 cies, E. They sprin, from the wall of the hood at the sides 

 of th.e ganj-lion, traverse tr.e cavity o^ the hood aiid be- 

 come inserted on its ventral v/ali. directly under thie 

 f^aui^licn. (Fit:.45 (a) ) 



Certain tracts of muscle ■f'ibers are very hi^^hly developed 

 in Species, E. Transverse sec t ions ( staine d witi; iron haematox- 

 ylin) throu^-n the v/all of ti^e iiood in front o ■f' tiie j^anj-,lion shew 

 blacK dots spread over tiie internal dorsal surface o -^ the hood 

 and these seem to be imbedded in the iissGdenrial linin^^. These 

 dots are the cut eijds of muscle fibers and as th,e sections are 

 follcv/ed posteriorly, tt.ese dots ii,rad\jally become massed about 

 ral-^ way betv/een the j^.aiii^lion and the sensory papilla and rep- 



