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BULLETIN OF THE UNITED STATES FISH COMMISSION. 
SYNCORYNIDiE. 
Trophosome. — ITydranths with capitate tentacles only, scattered over the elongated hody or 
growing in more or less distinct verticils. 
Gonosome. — Gonophores usually borne above the bases of the proximal tentacles, and producing 
attached or free medusae with 4 radial canals and 4 tentacles with bulbous bases, and a deep bell. 
Key to genera of Syncoryniclx found in the Woods Hole region. 
A chitinous perisarc investing the stem. Hydranth hody shorter than stem when expanded Syncoryne. 
No chitinous perisarc. ITydranths sessile, with long cylindrical bodies Corynitis. 
Trophosome. — Ilydrocaulus well developed, often branched and more or less annulated. Hydranths 
with numerous stout capitate tentacles and terete bodies. 
Gonosome. — Medusae as described above, bulbous bases of tentacles often with dark eye-spot. 
Syncoryne mirabilis (Ag. ). Fig. .3.. 
{Coryjic 7nirabilis Agassiz, Cont. Nat. Hist. U. S., iv, p. 185.) 
Trophosome. — Colony irregularly branching, without distinct hydrorhiza. Hydranths with terete 
body and about 16 stout capitate tentacles. Perisarc not annulated. 
Gonosome. — Medusae borne on the hydranth body, with 4 radial canals and 4 marginal tentacles, 
which are rudimentary and without evident eye-spots in the sessile medusae, and a very large proboscis 
on which the sexual elements are produced and cast forth before the medusae become free. The free 
medusae are more hemispherical in shape and have fully developed tentacles with eye-spots on their 
bases, and the proboscis is much smaller. 
