83 



Wiishingtoni Xutting 1901 d) mit unter die Synonyme stellen. Auf die Ähnlichkeit dieser 

 Art mit H. gracile hatte Nutting (1899) schon selbst hingewiesen. 



Fundort: Okinosebank, Sagamibai. Station 5. 10. November 1904. — Haidashi- 

 hank. Sagamibai. Durch Fischer. 



Diese Art scheint eine sehr weite Verbreitung zu haben, denn sie findet sich in der 

 ganzen Ausdehnung des Indopacitic, sowie im Mittelmeer und Westafrika: bei der Marion- 

 Insel im südl. Indischen Ocean (Allman 1888), Booth-Wandel-Insel (Billard 1906 a), Ceylon 

 (Thornely 1904), Australien (Bale 1888, 1894), Neu-Süd-Wales (Ritchie 1911), Neu-Seeland 

 (Marktanner 1890), .Japan (Inaba 1890), Westafrika (Billard 1906c), Patagonien (Allman 

 1888, Jiiderhulm 1904 a, Ilartlaub 1905), Westküste von Nicaragua (Clarke 1894), Fuget 

 Sound (Fräser 1911), Californien (Torrey 1904); — Französische Mittelmeerküste (Weis- 

 mann 1883, Motz-Kossowska 1911). 



Für Japan neu. 



Tiefe: 180 m. 



Diese Art ist vielfach bewachsen mit anderen kleineren Hydroiden, besonders mit 

 Hebella corrugata (Thornely) und Filellum serratura (Clarke). 



,Nr. 16. Halecium sp. (Inaba 1890 Fig. 41, 42, 43, 44, 45.) 



Trophosome. Stern slender, 1 5 mm high, branching somewhat, with irregulär constrictions 

 in different parts, with but few distinct segments; when the Segments are distinct, the con- 

 striction lies always directly above the hydrotheca. Hydrothecae alternate, short, tubulär, margin 

 of themouthstraightandslightly turnedoutwards, two ormore usually lying oneinsidethe other, 

 five or six sometimes forming a complex of tolerable length, hydranth always in the last one. 



Gonosome. Feraale gonotheca ellipsoidal, with a short stalk, growing out from the 

 lower part of the stem or from the hydrorhiza. 



Colour. Transparent. 



Locality. W^est of Misaki, Sagami Sea, 5 m, on dead roots of seaweeds. 



Date. Gonothecae found in January. 



This species is even more elegant than Nr. 15 [Halecium sessile N.] and shows well 

 all the characteristics of the genus. The hydrotheca is short, tubulär, with a diameter 

 hardly different from that of the stem and branches, but with the mouth expanded in 

 the form of a saucer. When examined more closely a transverse downwardly directed 

 septum is found directly below the mouth, dividing it from the lower tubulär portion 

 (Inaba fig. 43, 44); the hydranth is therefore contined, as a matter of fact, to the upper 

 saucer - shaped portion. More strictly speaking, therefore, the tubulär portion is not a 

 hydrotheca, but a portion of the stem or brauch, only the upper saucer-shaped portion 

 deserving the name. When several hydrothecae are piled upon one another, the tubulär 

 portion arises from the lower end of the next lower saucer-shaped part and expands again 

 into a similar form, repeating the same relation all through. The septum is present only 

 in the terminal hydrotheca and absent from the interniediate ones. On the outer surface 

 of the saucer-shaped portion directly above the septal line there is a row of small spots, 

 which are present, according to Allman, in all the species of the genus. 



In my specimens the gonothecae are not fully developed and are consequently few 

 in nuuiber; their position, shape and sex could, however, be recognized." (Inaba 1890.) 



11* 



