Vou. 2] Torrey.—Hydroids of the San Diego Region. 37 
Gen. Plumularia, Lamarck, 1816. 
40. Plumularia alicia. 
Plumularia alicia, Torrey, 1902, p. 75, pl. 10, figs. 96, 97. 
Trophosome. Stems in clusters, slender, loosely branching, 7 to 13 
em. high: divided transversely by faint nodes into short equal internodes. 
Hydrocladia atlernate, one from distal end of each internode, and with 
4 to 7 hydrothecae; thecate and non-thecate internodes alternate, separated 
by nodal septa which are alternately transverse and oblique; thecate inter- 
nodes twice as long as non-thecate. Proximal and distal septal ridge in 
each internode. Hydrothecae free for at least half their length, adcauline 
contours, in profile, somewhat recurved. A single nematophore on each 
internode of stem on side opposite origin of hydrocladium; 2 nematophores 
in each axil; each hydrocladial non-thecate internode with 1 nematophore; 
theeate internodes with 1 mesial and 2 supracalycine nematophores. Per- 
isare of stem thick and brown, of hydrocladia delicate and colorless. 
Gonosome. Male gonangia small, ovate, attached by very short 
peduncles between the nematophores in the axils of the stem or branches. 
Distribution. San Diego, 15 to 25 fathoms; Long Beach, 
Cal., 5 to 13 fathoms. Gonosome present, June and July, 1901. 
41. Plumularia megalocephala Allman. 
Plumularia megalocephala, Allman, 1877, p. 31, pl. 19, figs. 1, 2. 
Plumularia megalocephala, Nutting, 1900, p. 57, pl. 1, fig. 5. 
Trophosome. ‘‘Hydrocaulus irregularly branched, not fascicled; 
pinnae alternate, each borne close to the distal end of an internode of the 
stem, where it is supported on a long stout process of the internode; prox- 
imal internode of pinna short and destitute of hydrotheca; following inter- 
nodes longer, every alternate one carrying a hydrotheca, and slightly 
longer than the others. Hydrothecae small and shallow, each borne near 
the middle of its internode, and supporting a very large hydranth. Beside 
the supracalycine pair of nematophores, each hydrotheca-bearing internode 
carrying a single mesial nematophore at the proximal side of the hydro- 
theca; intervening internode carrying two mesial nematophores, and short 
basal internode carrying one. 
““Gonosome not known’? (Allman). 
Distribution. Off San Diego, in 40-75 fathoms. Off Alli- 
cator Reef, 14 fathoms (Allman). Albatross Station 2669, lat. 
N. 3° 9% lone. W. 79° 33’, 352 fathoms (Nuttimeg). 
‘“The internode interealated between the hydrotheea-bearing 
internodes was sometimes present, sometimes absent, and was of 
variable length. The internodes of the stem carry two nemato- 
phores placed laterally and alternately, and one or two pairs on 
it a lateral process’? (Allman). 
