(56) 

 is also a fairly vrell developed layer cf circular muscles am 

 these together v.ltk trie Ioih.i tudinal muscles t^ive the appear- 

 ance iii surface views of tlio longi tudiiial tracts ^iviiii^ o f ^ 

 bran ci.es. 



The iiervous system o -^ t;ie Actinotrocha of Phoronis Sabat- 

 ieri is less hij^hly developed, jud^in;^ frorr: the specimci^s I 

 have examined, than tnat o -^ either Species, A,, cr Species, B. 

 The i~ani;lion or as Roule (20) Cc<,j.xs it ::...« "plaque cSj^iiali qu e" 



eoiitains {^an^lion cells like ti.ose I have found in other Actin- 



present 

 otrocha.e, v/hieh shows that ti-.ere is something mo re^ than a sim- 

 ple subepidennal nervous system, such as Houle has aoscribed, 

 in ohe Ac tinotro ciia of Phoronis Sabatieri, 



Muscular System:- Tiiere is no doubt but t-iat there is 

 some diversity in the arrangement of muscle :*^ibers in the dif- 

 ferent species of Aetinotroci;ae. A stud-; of tiie two Species, 

 A. aiid E, , as well as ti:e description of different species by 

 other ivivesti^ato rs convinces me of this. 



In my study of ti:e muscular system 1 have had best results 

 with material fixed in "Plerriming 's strong solution ana stained 

 with Haidenhain's iron haematoxylin. These solutions make the 

 muscle fibers stand out very distinctly, whereas material fixed 

 a,nd stained v;ith other fluids shows them so feebly that the 

 muscle tracts might easily be over-looked. 



