584 I. iKEDA : 



the septum (uies.). These canals open Ijy funnels (/.) into the 

 l)odv-cavity (rectal chamber) which separates the intestine {int.) 

 from the oesophagus {œs.). These funnels correspond to the larger 

 funnels of Benham, so that in a longitudinal section they appear 

 as long ciliated cell-masses running longitudinally along the 

 lateral mesenteries. If we trace the funnels a little downwards, we 

 find another kind of funnels on the opposite sides of the lateral 

 mesenteries, opening into the lateral chambers. They are re- 

 presented in fig. 62 b if.'), wliicli is taken from the right nephri- 

 dium. They are short indeed and are ;i])t to l)e overlooked. 



Again as to the ring vessels, they are found always as two 

 concentric loo])s (the recipient and the distrilniting) standing side 

 ))y side, and, as was described by Bexiiam, each tentacular vessel 

 receives two small branches rcs])ectiveiy from the two vessels. 

 Besides, in Phoronis hippocrepicr whicli is known from llfracombe, 

 I liave ascertained that the al)ove cited structures (the nephridia 

 and the ring vessels) are indubitably present without any modi- 

 li cat ion. 



If these structures can udt really be found in Fitoroms pmm- 

 tnophila, similar specific anatomical deviations nmst exist in other 

 little studied species, for instance, in P. oralis, P. (jracilis, P. hushi, 

 and so on. From these facts and from the variability of the 

 external characters, I am at ])resent unable to discover })oints ))y 

 wliich Phoronis audralix, P. liippocrrpid, and om- P/ioronis can be 

 differentially diagnosed. 



Tokyo Imjirrial University, 

 Science College. 



October, 1899. 



'^ For the oppurlunity oi'invosligaliii.;.' tiiis ^^pecies, I am luucli iiuk'KU';! to I'rul". Yasuda of 

 the Second Higher Sehuul who kimliy gave uie a tiiuatl purliun ul" a culuny. 



