364 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Thuiaria cupressina, (Linn.). Fig. 66. 
( Sertularia cupressina Linn., Syst. Nat., p. 1308.) 
Trophosome . — Colony consisting usually of a single very long and graceful central stem which 
gives off alternate branches which again divide dichotomously into long alternate branchlets; giving the 
appearance of a verticillate arrangement. Internodes much shorter than in the last species, each bear- 
ing several pairs of subopposite hydrotheeae. Hydro thee* immersed nearly to their ends, tubular, 
rather straight, with a not very pronounced bilabiate aperture. 
Gonosome . — Gonangia borne in rows on upper sides of pinnules, shaped like those of T. ccrgentea. 
Distribution . — Vineyard Sound (Verrill). A specimen in the U. S. Fish Commission collection 
at Woods Hole is labeled, “E. by S. Sankety Light, 25 fath.” 
66. Tlmiaria cupressina (Linn.) . A. Gonangia. 
Thuiaria thuja (Linn.). Fig. 67. 
{Sertularia thuja Linn., Syst. Nat., p. 1308.) * 
Trophosome . — Stem rigid, sharply and finely geniculate, without branches on lower portion; 
branches forming spirals, each dichotomously branched and forming a flabellate structure. All of the 
branches and branchlets are stiff and harsh, very different from the graceful structures of the preceding 
species; internodes very thick, each bearing several pairs of closely approximated subopposite 
hydrothecfe, the top of one often reaching to bottom of one immediately above. Hydrothecae tubular, 
somewhat swollen below, apertures with two rather inconspicuous opposite teeth of about the same size. 
Gonosome . — Gonangia ovate, without lateral spines, and with a short collar and round aperture. 
Distribution . — Off Nantucket. (Vinal Edwards). 
HY DR A LLMANTA. 
Trophosome . — Stem branched, the branches plume-like. Hydro- 
thecae in groups on one side of terminal branches, arranged in an alter- 
nate manner, curving to right and left. 
Gonosome . — Gonangia ovate, with a terminal aperture surrounded 
by a slight collar. 
Hydrallmania falcata (Linn.). Fig. 68. 
[Sertularia falcata Linn., Syst. Nat.., p. 1309.) 
Trophosome . — Stem slender, without hydrothecae; branches plume- 
like, the branchlets divided into internodes, each of which bears a group 
of several hydrothecfe on its front or upper side. Iiydrothecae flask- 
shaped, swollen below, narrow above, curved distally and ending in a 
bidentate aperture with an operculum. 
Gonosome . — Gonangia as described above. 
Distribution . — Common in rather deep water throughout the Woods Hole region. 
B. 
68. Hydrallmania falcata (Linn.). 
A. Portion of branch, side view. 
B. Gonanginm. 
