(7t) 

 laterally r-laced oiic; they are rreseut oiily in Lfie youn. larva of 

 11^ or 14 teiitacles. '^rthermore, in t.te larva with Ik or 14 

 tentacles, there is no sirn of the beginning of the adult bocty 

 cavity. /^Ithou-h these ne no de rmal masses v/hich, accorain.^ to 

 niy observations, ^ive rise to the blood corpuscles, have a simi- 

 lar position to the funaament of the younfj adult boay cavity yet 

 1 aiT! coi'Vinced that they uo not i^ive rise to it. 



In Species, A., there is no iiitimate relation between the 

 masses of blood corpuscles aiid the nephridia, such as has been 

 described by Masterman (15) f 'o r the species from St. Anarev/s Bay 



and by Lon,:chyjnps (12) for Actinotrocha branch! ata. In tlie lor- 



bloua corpuscle masses 

 va of 10 tentacles the , are, hov/ever, closelv arclied to the 



Stomach wall in the re^^ion of the digestive area. There is no 

 mesoderirral epithelium covering that part o f t he surface of the 

 stomach v.hici'i lies within the collar cavity ana liz^ blooa cor- 

 puscles se«!m t,r be so intimately relatea to the di;_,estjve areas 

 tliat 1 sjri iiiclined to lielieve tnat they receive nourishment from 

 them, 



7/hile the blood corpuscles vary in size and undoubtedly mul- 

 tiply by karyokinetic division yet T have never found the "largo 

 and some\7tiat coarsely granular" and the "smaller finely granular" 

 i; corpuscles th^t Ikeaa (9) spea^'S of nor in this species nave 1 

 ■ound any "gigaijtic mesoderm cells" in the region of the blood 



