HYDROIDS OF THE WOODS HOLE REGION. 
337 
PENNARIA. 
Trophosome . — Colony pinnately branched, with a pronounced chitinous perisarc. Hydranths with 
a pyriform body and long mobile proboscis beset with capitate tentacles. 
Gonosome . — Gonopliores borne above the proximal row of tentacles. Medusse oblong ovate, 
with a very large proboscis bearing the sexual products. 
Pennaria tiarella McCr. Figs. 14 and 83. 
(Proceedings Elliott Soc., vol. I, No. 1, p. 153.) 
Trophosome . — Colony attaining a height of about 6 inches, with main stem and branches geniculate 
and beautifully annulated above origin of each branch, branchlet, and pedicel. Hydranths large, the 
ones terminating branches being decidedly larger than the 
others; a basal whorl of about 12 filiform tentacles, and a 
number of capitate tentacles disposed in indistinct whorls 
on proboscis. 
Gonosome . — Gonopliores attached to hydranth body 
just above whorl of filiform tentacles, and producing oblong- 
ovate sessile medusfe which sometimes give forth sexual 
products while still attached, and sometimes become free 
before giving forth the sexual products. 
Color . — Stem horn brown with darker areas at the 
annulations. Hydranth body lined ivith vermilion, which 
shows through, producing a beautiful contrast with the 
white tentacles. Sessile medusas greenish with vermilion 
markings. 
Distribution . — Abundant on the piles of Fish Com- 
mission dock at Woods Hole, and also growing profusely 
on eelgrass near the Hole. One of the most abundant and 
beautiful species on our coasts. 
CORYMORPHID/E. 
Trophosome . — Hydranths solitary, without complete 
tube of perisarc, and having proximal and distal whorls of 
filiform tentacles and a number of fleshy or tubular proc- 
esses on the proximal end of the pedicel or stem. 
Gonosome . — Gonopliores producing medusae which 
have 4 radiating canals and 1 to 4 marginal tentacles, of 
which one is much the largest. 
CORYMORPHA. 
Trophosome . — Hydranth sharply distinguished from 
its pedicel and with numerous short filiform tentacles 
arranged in several closely set whorls around the distal end of the proboscis and a single whorl of 
larger tentacles around the base of the body. 
Gonosome . — Gonopliores borne on branched pedicels above the proximal whorl of tentacles and 
producing fixed or free medusae with either a single large tentacle or 4 tentacles, one of which is 
much the largest. 
Corymorpha pendula Ag. Fig. 15. 
(Cont. Nat. Hist. U. S., iv, p. 276.) 
Trophosome . — Hydranths attaining a height of 3 to 4 inches when alive and fully extended. 
Pedicel with canaliculated ccenosare, the canals appearing superficially as longitudinal bands which 
anastomose, especially on the proximal part of the pedicel the distal part of which is abruptly 
F. C. B. 1899—22 
