HY DROIDS OF THE WOODS HOLE REGION. 
343 
CLYTIA. 
Trophosome. — Colony not regularly branched. Hydro theca 1 with toothed margins and long 
pedicels. 
Gonosome. — Gonangia containing gonophores which produce medusa: with 4 radial canals, 4 
marginal tentacles at birth, and 8 lithocysts between the tentacle bases. 
Key to the species of Clytia found in the Woods Hole region. 
Hydrothecae small, bell-shaped, with deeply cut teeth C. bicophora. 
Hydrothecae small, cylindrical, with sharp teeth and short pedicels C. cylindrica. 
Hydrotheca: larger, stout, broadly campanulate, or subtriangular in outline, 
with large, evenly rounded teeth C. noliformis. 
Hydrothecae very large, with parallel sides and evenly rounded teeth C. grayi. 
Clytia bicophora Ag. Fig. 21. 
(Cont. Nat. Hist. U. S., iv, p. 304.) 
Trophosome. — Stem seldom branching, never regularly so. Hydrothecse 
deeply campanulate, with about 14 pointed teeth. Pedicels large, long, annulated 
at the ends, usually smooth through the middle portion. 
Gonosome. — Gonangia deeply and evenly ringed, resembling a Chinese lan- 
tern, usually borne on the rootstock, sometimes on the stem. Medusa when 
liberated hemispherical, with 4 tentacles and 8 lithocysts situated between the 
bases of the tentacles, and a short manubrium. 
Distribution. — Shallow water, attached to shells, other hydroids, seaweed, 
etc. Found on the stems of Tubularia erocea growing on the piles of the U. S. 
Fish Commission dock at Woods Hole. 
Both Hincks and Verrill regard this species as identical with Clytia john- 
stoni Alder, of British waters. I have carefully compared American specimens of 
C. bicophora with specimens of C. johnstohi from England, and find that the former 
is a much more delicate and smaller species, the hydrothecse of 0. jolmsloni being 
on the average twice as long and wide as those of C. bicophora. 
Clytia cylindrica Ag. 
(Cont. Nat. Hist. U. S., iv, p. 306.) 
Trophosome. — Stems unbranched, with pedicels shorter than 
in C. bicophora, annulated at the proximal and distal ends. Hydro- 
thecae cylindrical, small, deep, with about 10 deeply cut, sharply 
pointed teeth. 
Gonosome. — Gonangia slender, oblong, flattened, not annulated, containing devel- 
oping medusae which escape singly. Medusae not described. 
Distribution. — Much as in the last species. Found in Buzzards Bay and at Naushon. 
(A. Agassiz.) 
I have not seen this species, and have compiled the above descriptions from the 
writings of Louis and Alexander Agassiz. 
22. Clytia noli- 
formis (McCr.) 
Clytia noliformis (McCr. ). Fig. 22. 
( Campanularia noliformis McCr. , Proc. Elliott Soc., vol. i, No. 1, p. 194.) 
Trophosome. — Pedicels short, usually not more than twice as long as the hydrothecse, strongly 
annulated, rising from a creeping rootstock. Hydrothecse broadly campanulate, with 10 to 12 very 
prominent, deeply cut teeth with rounded points. Texture of hydrothecse stouter than in other 
species of the genus. 
Gonosome. — My specimens are without gonangia, and I have been unable to find any description 
of them. 
It is not certain that this species occurs in the Woods Hole region. Dr. Agassiz reports it from 
Buzzards Bay, but as he considers it identical with the Clytia cylindrica of his father’s work, a species 
that appears to me to be distinct, I am not sure whether he had McCrady’s species or not. My own 
specimens came from Beaufort, N. C. 
