121 



B sac constitutes the terminal group of appendages and may also be divided into two 

 different parts, the proximal B 2 ac I' (one gelatinous polypoid, 8 gonophores, one gonopalpon) 

 the distal B 2acl" (one gonopalpon, one medusiform gonocalyx, 8 gonophores). 



Situated proximally to B 2a \s B26, which this time shows only one left side-branch 

 and a terminal group; the side-branch [B 2 6a) shows again a division into a proximal group 

 B 2 ba r (one gelatinous potypoid, one gonopalpon, 4 gonophores, the gonopalpon containing 

 black granulations) and a distal group B 2 ba I" (one gonopalpon, one medusiform gonocalyx, 



4 gonophores). Next to B 2b we find the third left lateral group B 2c which consists of one 

 group only, B 2 c I' distally (one gelatinous polypoid, one gonopalpon with granulation, 6 gono- 

 phores) and B2cl" proximally (one gonopalpon, one medusiform gonocalyx, 5 gonophores). 

 Finally we find as a terminal group the two constituents B 2d, which consists of one gelatinous 

 polypoid, one palpon, 2 gonophores and B 2 c which consists of one medusiform gonocalyx, 



5 gonophores and a gonopalpon. 



This division of the first left side-branch shows assuredly the utmost regularity. We have 

 continued to analyse all the other side-branches and have found the most astounding variety. 



It would take too long to give a lengthy description of all the side-branches {A, B /, 

 C, D, E, F). The arrangement of the side-branches is as it seems to us nearly always indefinite 

 and irregular, as of all these only B 2 showed some regularity. But as it happens, in all the 

 end-branches we find the two divisions: one palpon, one gelatinous polypoid, gonophores and 

 one medusiform gonocalj'x, one palpon and again gonophores. In all 46 of these double-groups 

 we find the same constituents. Only in one case (the fourth lateral division of the side-branch A) 

 we find besides the double-groups one more in addition so that such a threefold group consists 

 of proximally: i) one gelatinous polypoid, one palpon, 5 gonophores; 2) one medusiform gono- 

 calyx, one palpon, 5 gonophores; 3) one medusiform gonocalyx, one palpon and 5 gonophores. 

 We cannot say whether this division into three is quite an abnormal one, but we rather incline 

 to think this is the case, as out of 46 groups only one was threefold. 



We noticed also in many cases that in palpons (never in gelatinous polypoids) there 

 occurred internally black granulations. In all the 46 groups we found no distinct mouth-opening. 

 The remarkable polypoid structure which occurs between the two main side-branches A and C 

 (see PI. XXIV, fig. 175) shows not only distinctly the same black granulations but also a very 

 clearly visible mouth, the aperture to be seen with the naked eye. We cannot call this structure 

 a palpon and further as its walls are very muscular we incline to regard it as a siphon. In 

 that case the main branch of the gonodendron could be considered as part of the stem of the 

 siphosome and in that case the side-branches A, B, C, D, E, F would be considered as the 

 real gonodendra. 



One bunch of generative organs then consists of many gonodendra. 



In that case the only gelatinous polypoid belongs also to the main stem of Physalia. 

 How far the palpons, siphon and gelatinous polypoid are related, we cannot say. 



We always found that in the group in which a medusiform gonocalyx occurs, the gelatinous 

 polypoid is wanting and vice versa. But it is not therefore at all certain that the gelatinous polypoid 

 constitutes a modified medusoid gonocalyx, and has assumed a function which is as yet unknown. 



SIEOGA-EXPEDJTIE IX. 1 6 



