222 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



The stem bears a hydrotheca on its front near the base of each 

 hydrocladium. Hydrocladia alternate, borne on the front of the 

 stein rather than on its sides, each with a strongly marked node a 

 short distance from the stem; but there are no evident internodes 

 except near the ends of the hydrocladia borne on the distal part of 

 the stem. Here they are oblique and there is a tendency toward 

 a hydrotheca to each internode. In one or two places intermediate 

 internodes are seen, but this is quite exceptional. Hydrothecae short 

 cylinders in shape, resembling drums, the distal half of the adcau- 

 line side being free, slightly expanded near the margin which is even 

 and round. Nematophores — below the base of each hydrotheca is a 

 nematophore that greatly resembles those of the statoplean plumu- 

 larians, being sessile and apparently adherent to the lower part of 

 the hydrotheca. There are usually two other mesial nematophores 

 between successive hydrothecae which are on short pedicels and 

 movable. A pair of supracalycine nematophores arise from the 

 point where the distal part of the hydrotheca becomes free, but do 

 not rise to the level of its margin. Their distal part is bell-shaped 

 and the margin somewhat flaring. There are also irregularly placed 

 nematophores on the stem. 



Gonosome. — Gonangium oblong ovate, round in section, aperture 

 oblique, borne on a short pedicel growing froni a hydrocladium at 

 the base of a Irydrotheca. There is a single large nematophore on 

 the proximal part of the gonangium near the pedicel. The gonangia 

 have a slightly thickened rim around the aperture and the contents 

 indicate that the colony is male. 



Locality. — Davao Bay, from pearl oyster, several specimens se- 

 cured. 



Distribution. — Griffiths Point, Australia (Bale). 



PLUMULARIA AGLAOPHENOIDES Bale 



Plate 43, figs. 2, 3 



Plumularia aglaophenoides Bale, Australian Hydroid Zoophytes, 1884, p. 

 126, pi. 10, fig. 6. 



The specimens secured by the Albatross agree quite closely with 

 the description and figures by Bale, which are so satisfactory that 

 nothing need be added so far as the trophosome is concerned. 



The fragments before me do not show the fascicled stem as de- 

 scribed by Bale, but they may be branches rather than parts of the 

 main stem. 



Gonosome. — Heretofore unknown. Gonangia borne on the hy- 

 drocladia, in the shape of heavy curved clubs. Smaller than in the 

 last species and about twice the height of the hydrothecae. No 

 nematophores are seen at the bases of the gonangia. 



