67 



The nectosome to the broken end («) has a length of 2,5 cm.; is strongly muscular, 

 gets narrower some distance underneath the pneumatophore ; (5 mm.) from that point it widens 

 gradually (5 — 10 mm.) and gets its original breadth again after 8 mm. On this widest part we 

 find many longitudinal furrows and ridges; the nectostem is very muscular. On the side where 

 the greatest amount of nectophores are being developed, we find the same muscular elevations 

 which in other Physonccta are the indications of detached nectophores. Although all these 

 muscular off-shoots are situated in one continual longitudinal line (in the sketch this line is 

 interrupted, there where the nectosome is broadest, but as they continue somewhat more to 

 the opposite side from that shown in the sketch, they have not been added) the nectophores 

 probably do not develop in one line. This we found also in Crystallouiia and other Agalinidae 

 and is therefore a quite generally occurring phenomenon. It is very difficult to give an exact 

 description of all the appendages and of the position on the common stem, many being lost, 

 the siphosome showing many contortions. 



In PI. XI, fig. 86 they are sketched in their natural position; the sketch shows the 

 specimen as it was taken by the Siboga expedition. 



We suppose a to correspond with a in PI. XI, fig. 85, so «' is the most proximal part 

 of the siphosome and in this part the sketch is partly hidden by the most distal part of the 

 siphosome which is entirely covered by numerous appendages, the description of which will follow. 



The first 15 mm. of the siphosome (or is it the distal part of the nectosome?) is devoid 

 of any appendage; the muscular elevations are well-marked on one side of the 5 mm. broad 

 strongly muscular stem. The stem itself shows annular constrictions and a multitude of longitudinal 

 furrows over its whole length. 



Then after these 15 mm. we find a first gonodendron, its gonostj'le having already 

 attained a length of 7 mm. It shows proximally well-developed gynophores; the most distal 

 ones are the largest in size. The black granulations are visible in the gonostyle, and the black 

 colour of the gonostyles contrasts quite clearly with the whitish gynophores. 



Five mm. further on another gonodendron is found attached in the transverse furrow 

 formed by one of the constrictions. One gonopalpon of the length of 3 mm. is found attached 

 to it. In the immediate neighbourhood of this second gonodendron we find a slender palpon 

 of 3 mm. length which seems to be attached immediately to the stem. It may be, however, 

 that the distal part of the gonostyle is still present though very short and that this palpon is 

 attached to it and should therefore be a gonopalpon. Distinctly attached to the siphosome is 

 a 3 mm. long foliaceous bract the .structure of which we will describe further on. 



At a distance of 7 mm. from this young bract we find another gonodendron, which is 

 larger and better developed than the two first ones. There are two gonopalpons attached to 

 the gonostyle of which one ((z) is figured. Those situated on the right and left side belong to 

 another gonostyle. This time the palpon (a) has attained a length of nearly 6 mm. It shows a 

 very peculiar structure which is more clearly seen in the two other palpons. Its entodermal 

 layer shows elongate Sshaped spots, which show as transparent worm-like blots on the also 

 transparent background. These spots are present on the whole surface except for the basal part 

 of the palpons which is a restricted muscular pedicle, and for its apex, which is sharply pointed 



