REPORT ON PHILIPPINE HYDROIDA 223 



Locality. — Dredging station 5151, Sulu Archipelago, Tawi Tawi 

 group, Sirim Island,' 5° 24' 40" N., 120° 27' 15" E.; depth, 24 

 fathoms. 



Distribution. — Broughton Island, Australia, 25 fathoms. This 

 seems to be the first report of the occurrence of this species in the 

 Philippine region. 



PLUMULARIA FLABELLATA, new species 



Plate 43, figs. 4, 5 



Trophosome. — Colony strictly flabeltate in form, 8.7 cm. high and 

 with a spread of 9.5 cm. Color dark brown after long immersion in 

 alcohol. Stem, primary branches and secondary branches fascicled. 

 The branches and branchlets subopposite. Hydrocladia borne on 

 main stem, primary and secondary branches, opposite and springing 

 from the sides rather than the front of the stem or branch and more 

 closely approximated than is usual in this genus. Indeed, the general 

 facies of the colony would lead one to regard it as belonging to the 

 Statoplea rather than to the Eleutheroplea were the nematophores 

 not free or movable. Hydrocladia divided by oblique nodes into regu- 

 lar internodes, each of which bears a hydrotheca. Hydrothecae quite 

 small, rather closely approximated, deep, pitcher-shaped with a 

 margin devoid of teeth, everted in front and with the sides beveled 

 off behind where they join the hydrocladium. The internode behind 

 the hydrotheca is dense and shows internal thickenings of chitin 

 opposite the mesial nematophore and below the process bearing the 

 supracalycine nematophore just below the node between the adjacent 

 hydrothecae. Nematophores very minute, movable, fragile, often 

 lacking. The supracalycine pair are borne on slight processes below 

 the top of the hydrotheca and often hang down into the hydrothecal 

 cavity, this being rendered possible by the beveling of the hydro- 

 thecal margin behind. The mesial nematophore is borne on a rela- 

 tively short process below the hydrotheca. There are often two caul- 

 ine nematophores below the proximal hydrotheca on each hydro- 

 cladium. 



Gonosome. — Not present. 



Locality.— The holotype, Cat. No. 42179, U.S.N.M., is from Davao 

 Bay, growing on a pearl oyster. Station 5254, Gulf of Davao, Linao 

 Point, 7° 5' 42" N., 125° 39' 42" E. ; depth, 21 fathoms. The hydro- 

 thecae of this fine species very closely resemble those of P. dendritica 

 Nutting, 22 but it differs widely from that species in the form of 

 colony, manner of branching, color, and character of the hydrocladia! 

 internodes. 



^American Hydroids, pt. 1, the Plumularidae, 1900, p. 67, pi. 8, figs. 4-6. 



