91 



Each brauch consists of six joiiits and bears two hydrothecae. Hydrothecae very sballow, 

 with straight margin, separated from the next oue by three joinfcs. Neiuatophores slender, 

 2 side by side above and behind the hydrotheca, 2 below ifc one above the other (one on 

 each Joint), 1 in the axil of the brauch, and 1 in the middle Joint of the stem between 

 two successive branches. 



Gonosome. Unknown. 



Colour. Nearly transparent. 



Locality. East of Misaivi, Sagami Sea, in a small hoilow of „Teonoiwa' (rock), on 

 sea-weeds. 



This species is very small, being less than 10 mm high; the branches are short, and 

 being all of about the same length this species can easily be distinguished frora P. setacea 

 by its general form. On a closer examination, however, the number and arrangement of 

 the nematophores are found to be exactly the same as in P. setacea. If in P. setacea each 

 Joint of the steni were divided into three and each short Joint of the branches into two, 

 the arrangement would be exactly what we find in the present species. Moreover, the 

 joints do not appear t) be absolutely fixed in this species, being sometimes irregulär; in 

 the lower part of the stem particularly three joints are frequently united into one. 



The raore minute differences from P. setacea are as follows; the comparative short- 

 ness of the stem. the comparative thickness of the perisarc, the comparatively small size 

 and greater number of the joints, the comparative shallowness of the bowl-shaped hydro- 

 thecae, and the fact that there are always two on each branch. 



I obtained only a single colony of this species in January. As the reproductive 

 Organs are not present, I cannot make any statement concerning them. Attention of future 

 students staying in Misaki is called to this point." (Inaba 1890.) 



Plumularia Habereri Stechow 1909. 

 (Fig. 59-60.) 

 Nr. 4781 Sammlung Haberer. 



Nr. 44. Plumularia sp. Inaba 1892 b fig. 8—10; 1892 c. 

 Plumularia Habereri. Steehow 1909 p. 77 tab. 6 fig. 4. 



Für diese Art sind die Angaben Inabas von ganz besonderer Wichtigkeit, weil 

 sie die Beschreibung der bisher unbekannten Gonotheken enthalten. 



Meinen früheren Angaben ist hinzuzufügen, daß es nicht eine Anzahl kleiner un- 

 verzweigter Stöckchen sind, die auf großen Gorgoniden waclisen, sondern daß diese 10 bis 

 25 mm hohen Stöckchen nur die freien Enden eines großen Plumularia-Stockes darstellen. 

 Dieser 300 mm hohe Stock ist mit Ausnahme seiner distalen Enden von einem Schwamm 

 überwachsen, aber nicht gleichmäßig, sondern in vielen einzelnen Knoten, was ihm ein 

 ganz gorgonidenhaftes Aussehen gibt. Schneidet man den Schwamm weg, so findet man 

 darunter den dicken polysiphonen Stamm der Plumularia. 



,Nr. 44. Plumularia sp. (Inaba, Shima Hydroids 1892b Fig. 8, 9, 10.) 



Trophosome. Stem hard and very large, 200 mm high, composed of many tubules, 

 with many branches on either side, all arranged more or less in one plane. The ultimate 

 branches consisting of more or less regulär joints, each giving rise to a branchlet and 



12* 



