HYDROIDS OF THE WOODS HOLE REGION. 
327 
Suborder GYMNOBLASTEA. 
No hydrothecse nor gonangia. 
CLAVID/E. 
Trophosome. — Hydrocaulus branched, simple, or not evident. Ilydranths with elongated terete 
bodies, upon which the smooth filiform tentacles are scattered, or arranged in an ill-defined spiral. 
Gonosome. — Gonophores growing from the hydrorliiza, branches, or body of the hydranths, and 
not producing free medusae. 
Key to genera of Clavidee found in Woods Hole region. 
Colony unbranched. Hydranth stems not inclosed in perisarcal tubes. 
Colony profusely branched 
CLAVA. 
Trophosome. — Hydranths single, with slender basal portions and terete bodies. Filiform tentacles, 
about 20 to 30 in number, scattered over the body and proboscis. 
Gonosome. — Gonophores borne in clusters immediately below the basal tentacles. 
Clava leptostyla Agassiz. Fig. 1. 
(Contributions to the Natural History of the United States, 1862, IV, p. 218.) 
Trophosome. — Hydranths with a slender proximal portion and a long distal proboscis; tentacles 
more than 20 in full-grown specimens, hydrorliiza forming a closely aggregated mesh work of con- 
tiguous tubes. 
Gonosome. — Gonophores borne below the proximal 
tentacles in compact clusters, which may encircle the 
hydranths or be unsymmetrically collected on one side. 
Color. — Brick -red . 
Distribution. — Bias been found on the rocks near the 
Hole, where it occurs in patches under the seaweed. 1 
have also found it attached to the piles of the old guano 
wharf. 
CORDYLOPHORA. 
Trophosome. — Colony regularly branched. Hydranths 
with scattered filiform tentacles. 
Gonosome. — Gonophores borne on the branches, ovate, 
inclosed in a chitinous investment which resembles a gon- 
angium. 
Cordylophora lacustris Allman. Fig. 2. 
(Brit. Assoc. Rep., 1843.) 
Trophosome. — Colony regularly branched, attaining a 
height of about three-fourths inch. Main stem not fascicled, 
straight, giving off alternate 1 iranches, which in turn often 
give off alternate branchlets and pedicels; branches and 
pedicels often annotated at their origins. Hydranths with 
fusiform bodies and 16 to 20 scattered filiform tentacles. 
Gonosome. — Gonophores ovate, invested in a gonangium-like extension of perisarc, borne on the 
branches and hydranth pedicels near their bases. Pedicels of gonophores very short and annulated. 
Distribution. — Found in a fresh-water pond near the bathing beach at Woods Hole, Mass. 
This species is reported from the Woods Hole region just as these pages are going to press. The 
figure and description are from specimens collected by Prof. A. 1 >. Morrill and kindly forwarded to me 
by Dr. Charles Hargitt. 
1. Clava leptostyla Ag, 
Clara. 
Cordylophora. 
