(lOo) 



In Pnororiis Australia, Benhaxn (2) finas the circulatory sys- 

 tem much the sajiie as Caldwell does in the form that he worked on. 

 Practically the only point of difference is that he describf^s 

 the tentacular vessels as dividin., into two branches, one open- 

 in^j into t!ie distributing vessel (inner) and the other, into the 

 recipient vessel (outer). 



Andrews (1) finds that the vascular system of P. architecta, 

 as far as he has dete'-mined, ip 3i^-e tl:at c t' P. Australia '.vhile 

 Ikeda (9) days ti.at Be.x..a-. ' .-. :..c .ri; tio.. holas 1^00 d for P. Ijimai 

 and P. hii:.r"<^crepia, 



A transverse section thnouj. the lo^hotliOral crow:, or P. 

 architecta (l^ig.65) shov/a tnat tne cavity of each tentacle con- 

 tains a blood vessel \;hjch is attached to the inner surface of 

 the :"all. 



At the base of the tentacle^, a cress secHon sh.^s that 

 tne.e are t.o blocu v-^..^.. runnin, parallel to one another through 

 :nost 0- their course arouna the cavity 0- the lophophore. (^gs. 

 65 to 71) These vessels are distinct although closely appliea 

 to one another, thus differing from what Cori finds in P. psam- 

 -Phila. The outer ves.el and inner vessel (Fi,3.6d-.6) are, 



distributing" vessels which 

 ros-6 section throu;h 



respectively, the "recipient" ar: 



Eenham aeuc rices. in f-i ,- f-- .^ ■ 



in .1^. bw IS sricwn a c 



tne base o 



-o tentacle; 



Th no ujiout most ^ t 



he sectioii the 



