"PYLORIC GLAND" OF THE ASCIDIAN BOTRYLLTS. 45 



form a network over the intestine. All the tubes, ducts and 

 ampulla that have been examined carefully have been found 

 to be lined with a ciliated epithelium. Moreover, it is worthy 

 of note, perhaps, that Huxley. '51 and Delia Yalle ('81) have 

 observed a bladder-like -welling of the duct in Didcnunim. To- 

 daro figure- the -ame for Salpa. A type of gland differing 

 -lijitly from the one- referred to above was described by Julin 

 ('041 in Ari-lnnsfidia. The single dun was -hort, ami branched 

 into but ~i\ tubule- \\hich did not branch on the inte-tine but 

 ran par, il lei to one another almost -ill the \\a\ to the ami-. There 

 were no l\ pii al am pi 1 1 I.e. The-e tube- r.m be-t be compared to 

 (he ivetal tubule- de-i ribed above for Jititryllns. 



\- llie \\riter mentioned in the int rodliclory paragraph great 

 ditli-n -nee o! opinion exists a- to the function of thi- "r.;an. To 

 be -me. few author- ha\e \eiitured to -tron^ly -upport OIK- idea 



and Illo-l lla\e been i|llite te-er\ e< 1 in their Conclusion-. \ct it is 



o| -uttn ient iniere-t t \\arrant the \\riter'- re\ie\\ing their 

 opinion- biielly. n-iderin^ those \ieu- that \\ere ba-ed 



< le.irly on mi-, on. vpt ion- ct. \ to the -tructureof 



the or^aii. \\e \\ill take up a fe\\ of the other-. I\..ill\ \\hell 

 I lancoi k i lied (he or^aii in <|ue-tim a true liver much can 



be -a ill to -uppoit the \ie\\. It- relation to the blood -upply 

 plainl\ rei all- that of the \ ertebraie li\ er. Indeed u ith \\ hat \\ e 

 kllou at pre-ent of the or^ail. il \\"llld be \er\ dilticillt to relute 

 (hi- idea, particularly a- the \ertebrate li\er ha- been known to 

 6 icte ( armin. 



Chandeloii 7^ . |)ella X'alla '85 ami \--ii \\ini\\aitei ' 'c)6) 

 and l-ett '03 Consider, after thoroughly re\ iewing the -ubje.t, 

 that the function is digestive. Henri '03 ha- other than mor- 

 pholo-ic.il exidence. 1 |.- -i\-, \>. ~> ; : "Kn fai-ant ile- macei \i- 

 tion- de cette u'aiidi 1 p\lori.|ue. on obtient un liijiiide riche en 

 am\ la-e, il ne digere ni ralbumine, ni la tibrine; cette maceration 

 .igit an coiitraire faiblement -m la gelatine. Cette glande con tient 

 done bien de- ferment- digestifs. Les macerations des autres 

 parties du corp- de la Sdlpt donneiit de- re-ultats n^gatifs." 



Kupfter /.sj) and Koule '84 \>\ means of injections arrived 

 at the conclusion that the-e tube- \\ere part of the blood vascular 

 >y-tem. l.i>ter ('34), Huxley (,'511 and after them Pizon ('93) 



