FIJI-NEW ZEALAND EXPEDITION 211 
lanterns with a tubular neck and an aperture with everted or 
trumpet-shaped rim. 
Several small forms such as Hebella, Lafea and other eampan- 
ularians were found growing on the larger hydroids. 
A delicate plumularian belonging to the type genus Plumularia 
was found on the Sertularella mentioned above. This evidently 
belonged to the ‘‘Catharina group’’ as defined in the writer’s 
‘‘American Hydroids,’’ Part 1, the Plumularide, p. 55, and 
probably is the well known Plumularva catharina Johnston. A 
number of very beautiful colonies were secured. The numerous 
species of Plumularia intergrade so frequently that it is almost 
impossible to separate them according to any consistent system. 
By far the most spectacular hydroid secured was a great clump 
of plumularian colonies twelve to eighteen inches high, dark brown 
in color, with thick fascicled stems and numerous branches. This 
fine specimen evidently belongs to the genus Lytocarpus. The 
gonosome is in the form of a pseudo-corbula of separated, pro- 
tective branches which inclose an oval space over the part of the 
hydrocladium on which the gonangia themselves grow, the whole 
affair being much like that of Lytocarpus formosus Fewkes. The 
hydrothecal margin is quite oblique and strongly dentate, and the 
mesial nematophore attains the level of the margin. This form 
may prove to be new, but the writer does not think it advisable 
to insert descriptions of new species in the present narrative. 
