" PYLORIC GLAND" OF THE ASCIDIAN BOTRYLLUS. 41 



im Gefasssystem der Ascidien. Man findet dasselbe an den 

 colonialen Gefassen in der gemeinsamen Tunica der Synascidien. 

 Ich hake <l.th<-r das Gan/e fiir cinen besonders enwickelten 

 Theil dt> Circulationsapparates di-m wohl neben der Resorption 



des ("hymn- noch anden- Fum t imu-n zukommen." 



It" Ascidin i'd H hid -hould have open communication between 

 tin- lunicn nf the-e tube- .ind the him id ca\ity it would easily 

 explain IHAV Kupt'fer found tin- injection ma-s in the lumen of 

 the idand. Since no communication ha- been demonstrated, it 

 \\ould U- ea-ier t.i c\|ilain tin- iv-ult of Kuptfer in the liijit of the 

 \\riter'- o\\ n -\| leriment - with indie" c.irmin on Styelii (p. 43). 

 With tin- |in--cni i-\ idi-nc.- l.rfon- u- we caniioi a nine that there 

 i~ .m\ i omnuiiiit ati-ui ln-i\\rrn the Mm id -pace-, of ttntryllns and 

 the lumen ol the p\ loric inland. 



Tin cases in uhich cilia ha\e Keen -ecu in the ampulla- were 

 all oli~er\ed liefure ihe uioilem method- nf ni ; pic iechni<|iie 



\\ere i \o|\ed. ^iine then \\ e lia\e Leeii carried a\\a\ hy the 

 u-e of dead material \\heii in man -. perhap-. a- much, it 



not ill' 'IV. i . >\\\(\ lie -eell ill tile li\ il 



I'i/on ') ^ In- -tudied tli' :i of thi- or-aii Imth in tin- 



tadpole and Inn I i.l l^'lryllns. < n ilii- -tudy the \\ riter ha- veri- 

 fied the 11 -nit- and can Imt accept the conchi-ion of I'i/on (' 

 that in both the origin of the p\lori- inland i- I nun the 



endoderm b\ a -imple < li\ ert iculum of the i^iit. Thi- agl 

 ]ie|-|ectly with \'an Helledeii and Julin '84 and '86) in I'lldllu^ id, 



l.etc\ re '98 in /' na, Kit ter '96 in 



2 in ('A/re//;/./, I'ljanin '84 in /><>ln>!iini, etc. In all cases 

 it arises as an out-pocket of the -toinach. 



I \ci KIMI \ I-. 



The -mallnc-- of the p> loric inland in Hntrylln* and the tmeiie-- 

 of the tubes and ampulla- a- found in the larger a-cidian-, to- 

 gether with the clo-e ap|ilication of the ^laild to the walls of the 

 inte-tine, to the reproductiv ins or to the renal vesicles, 



\\onld forbid, in an\ form that ha- yet been available to the writer, 

 direct phv-iolijcal determination-. It is due to this that the 

 nature of tin- oi-an has been problematical. To be sure Henri 

 ('03) claim- to ha\e i-olated the -land in Sdlfxi, but a- \et the 



