Buskii. That efZi;3 and embryos v;e re not Ibuna by Loiif^cnamps 

 amonc the tentacles of PhooDnis a'Helgolavid is no doubt due to 

 the fact that the same habit prevails in the above form tl:at does 

 in. Phoronis architecta, 



V/hile the adults were laying, they were examined under the 

 compound iidcroscope. They showed lar<:;e nugibers of eg-^s v/hj-ch 

 v;ere floating; freely back ai/a forth iii the body cavity as the 

 aniiTial contracted and expanaed. Sections of adults iii this 

 conditJcii show that all these free eggs contaiiiOd t]:e first po- 

 lar body spindle. At intervals of about one iTiinute, an egg is 

 extruaed '.vith coiisiderable force from the nephridial openiiig 

 aiid in no case are the eggs at tnis momeiit witri polar boaies. 

 The wall of titC nephriaial ridge is transparent eiiou^x; to see 

 the eggs as they slip tnrou-j^n the larger part of tl"-e liepr.ridium. 

 Hia-.ile passing through, the eggs are pressed by tj;e walls of the 

 organ until they are about twice as Ioh:-, as broad, CFig.l) The 

 fact that ^hcrcnis architecta does not keep its eggs in masses 

 within t}ie tentacular crova-i together with the fact that liioat of 

 the individuals lay their eggs at about the same time of nigj:it, 

 iiiakes it possible to preserve any one stage in the development 

 of the embryo in sufficient quantity for a tiio rough study. 



_ 2'9 r? i li ?a t i£iij, 

 Ikeda (9) aiid Longci^'Jiixps (12) made the observation that the 



