REPORT ON PHILIPPINE HYDROIDA 221 



Locality. — Dredging station 5559, Jolo Island and vicinity, 

 Cabalian Point, 5° 51' 36" N., 121° 0' 45" E. Surface, on floating 

 Sargassum. 



Distribution. — Almost world-wide except in the polar regions, in 

 tropical, subtropical, and temperate zones. 



This interesting species on account of its habitat on floating sea- 

 weed has been very widely distributed and thus has come to vary 

 greatly. I strongly suspect that there is only one species of the 

 genus and that the forms such as P. philippina of Marktanner- 

 Turneretscher and P. griffini of Hargitt will eventually be rele- 

 gated to the list of synonyms. 



Family SYNTHECIDAE 



SYNTHECIUM TUBITHECUM (Allman) 



Sertularia tubitheca Allman, Memoirs Museum Comparative Zoology, 



vol. 5, No. 2, 1877, p. 24. 

 Synthecium tubithecum Nutting, American Hydroids, pt. 2, 1904, p. 134. 



This well-known and graceful species was dredged by the Alba- 

 tross at station 5311, China Sea, vicinity of Hongkong, 21° 33' N., 

 116° 15' E. ; depth, 88 fathoms. 



The gonosome is present and is very much like that of the type 

 examined by me in the Museum of Comparative Zoology at Cam- 

 bridge, 20 being very closely and deeply annulated throughout and 

 with a narrow neck and everted margin much like many gonangia 

 found in the Sertularidae, especially in the genus Sertularella. 



Distribution. — West Indies (Allman), Amboina and Ternate 

 Molucca (Pictet and Campenhausen), Hawaii (Nutting), Japan 

 (Stechow). 



This appears to be the first report of its occurrence in the Philip- 

 pines, unless, as I suspect, Hargitt's Synthecium fabellum 21 is a 

 synonym for S. tubithecum. It agrees quite closely, so far as the 

 trophosome is concerned, and his drawings of the gonangia show no 

 details by which his species can be differentiated from S. tubithecum. 



Family PLUMULARIDAE 



PLUMULARIA BUSKII Bale 



Plumularia buskii Bale, Australian Hydroid Zoopbytes, 1884, p. 125, pi. 10, 

 fig. 3; pi. 19, figs. 34-35. 



Trophosome. — Colony pinnate, 3 cm. high and with a spread of 

 1 cm. Stem not fascicled, with some irregular annulations at the 

 basal end, no evident nodes except at the extreme distal end where 

 there are a few oblique nodes resembling those on the hydrocladia. 



20 American Hydroids, pt. 2, The Sertularidae, 1904, p. 134. 



21 Hydroids of the Philippine Islands, 1924, p. 497. 



