8; 



= Pliysopliora liydrostatica Fewk. 79. 



= Phyiopliora tiiagnifica Ch. 88. 



= Pliysopliora liydrostatica Ch. 97 a. 



= Physophorr liydrostatica K. C. Schneider 98. 



Stat. 143. Lat. i°4'.5S., Long. 127° 52.6 E. Cat. 230. formald. 4°/^. One specimen. 

 Stat. 203. Lat. 3°32'.5S., Long. I24°I5'.5E. Cat. 173 B. formald. 4%. One specimen. 



The two specimens which were brought home by the Siboga expedition are ver)- much 

 the wor.se for preservation, having altered entirely. The disc-shaped siphosome is, however, 

 easily recognized (PI. XVI, figg. 120, 121) and we think we are justified in using the specific 

 denomination "■ hydrostatica' as on the whole the specimens, as they are, do not show any 

 specific differences. 



We first of all want to give a short description of Cat. 173 B. (PI. XVI, fig. 121) which 

 is remarkable for the enormous size of its pneumatophore. Chun (97 a p. 270) found nearly 

 the same length in the pneumatophore of PhysopJwra hydrostatica. His specimen showed the 

 length of 12 mm. and the breadth of 3 mm. We found the dimensions of 10 mm. leno-th 

 lY-, mm. breadth. 



As in Chun's specimen the pneumatophore is elongated and transparent, its outer walls 

 having an absolutely straight course and narrowing gradually near the top, where they are 

 covered over by dark brown coloured pigment. The entodermal septa separating radial pouches 

 are visible on the outer wall as longitudinal stripes; this is probably the result of the excessive 

 lengthening of the pneumatophore. A stigma was not found on the dorsal side. 



The nectosome has a length of 4 mm.; on the ventral side we found a quantity of buds 

 of young nectophores. Some indications of detached mature ones could also be seen but nothino- 

 can be said of the exact position of these on the nectostem. 



The siphosome is disc-shaped, flattened dorso-ventrall)'. It bends to the rioht but is not 

 yet grown together. 



Immediately on the right side of the nectosome some small buds are developed, which 

 are not yet differentiated. To the right we find one very long palpon (18 mm.) with its partly 

 broken palpacle. The disc shows furthermore a considerable quantity of stalks of siphons, 

 palpons, tentacles and four gonodendra, on which only a few gynophores are left. Tentilla are 

 not present. The exact position of the appendages on the disc is of course, owino- to the 

 absence of any mature ones, impossible to describe. F"inally the most distal |)art of the spiral 

 shows two small stalks of siphons. 



Cat. 2 JO (PI. XVI, fig. 1 20) is more complete as to the amount of appendages on the 

 siphosome. Its nectosome shows a pneumatophore of 2 mm. length and i mm. breadth. We see 

 here very clearly the radial pouches, which were invisible in the other specimen. The nectosome 

 consists of one more developed nectophore and indications of detached ones. It has a leno-th 

 of nearly 1,5 mm. 



The disc-shaped siphosome is smaller than in Cat. 173B. and shows regular facets such 

 as j\I. Sars 77 described in Physophora dorea/is and H.\eckel 88a. The appendages consist of 

 two mature siphons, a mature palpon with its palpacle, and young undeveloped ones, and two 



