(61) 

 the posterior pair of blooa corpuscle Hiasses ciirj. tue latter be- 

 come rati.er closely associatea v/iti". t i'.em. {'Fi^.AC) 1 couli not 

 discover that tliese fibers were ii^ any way related to tr.e ne- 

 pkriaia as has beeii aescribea for some species. 



In the re^^icii o-^ tne insertion of tke ventral tevitacles, 

 the muscle -fibers of the ventral tracts become a^iain applied to 

 ti.e ventral body wall but definite tracts are no lovii^er present. 

 However, in the trunk re^iion these fibers form a definite tract 

 which is coij-^ined to th.e veiitral body wall and it does not dis- 

 appear uiitil the perianal rin.: is reached. CPigs. 44(g) - (j;) - (i) ) 



/jfiOther tract of muscle fibers preseiit in Species, B. , 

 wi.icl: does not seem to be developed in other Ac tinot roci'-ae, 

 judi^in.; from existinjj descriptions, is tiiat found in the re-;icn 

 of tt:e bases o +" the tentacles. "^rom the dorsal muscle tracts, 

 where ti.e most dorsal and ai.terior pair of tentacles arise, mus- 

 cle fibers are ^-iven off wnich. follow the bases o-^ the tenta- 

 cles and wnici^ form a well developed rin^, of muscle ^^ibers; in 

 oth.er words, there is a ri H;,, of muscle fibers wiiich follov;^ tnc 

 line of insertion of the mesentery between the collar and tnink 

 cavities. ("^ig.44 e) 



A tract cf muscle fibers v.iiich also sssms to ccc-'r only 

 in Species, B, , is one compcsca of only a fev; fibers which are 

 found runiiing arx)und the edge of the hood on the internal wall 



