No. 412.| MORTH-AMERICAN INVERTEBRATES. 315 
Tubularia crocea Ag. 
(Parypha crocea Ag.) 
Trophosome: Colonies growing in dense tufts of tangled stems of from 
three to four inches in height. Stems sparingly branched, with occasional 
indications of annulations. Hydranths with tentacles much as in former 
species, but numbering from twenty to twenty-four in each whorl. 
Gonosome: Much as in the first species. Hydranths and gonads of rosy- 
red color, stem pale, whitish. Habitat. Growing in dense masses on piles 
of docks, floating timbers in harbors, and shallower waters. 
Hypolitis perigrinus Murbach. 
Under this name Murbach describes a hydroid taken at Woods Holl 
(Quar. Journ. Mic. Sci., Vol. XLII), which would seem to have some 
affinities with the Tubularide. The fol- 
lowing characters are summarized : 
Trophosome : Colony consisting of sim- 
ple hydranths with long hypostome and 
with distal and proximal whorls of filiform 
tentacles. Polyp free. 
Gonosome: Gonads borne on hypo- 
stome just above proximal tentacles and 
occur singly in the type specimen. Sessile 
medusoids, somewhat terete in form and 
devoid of tentacular processes. 
1o. HyBOCODONIDA. 
Hydrocaulus unbranched, solitary, with 
definite perisarc and hydrorhiza. Hy- 
dranths large, with proximal and two 
: 2 Fic. 15. — Hybocodon prolifer Ag. 
distal whorls of filiform tentacles. (ites Aces) 
Hybocodon prolifer Ag. 
(Cont. Nat. Hist. U.S., vol. iv.) 
Trophosome: Stems longitudinally striated, occasioned by ccenosarcat 
canals. Perisarc enlarged and annulated just below hydranth. Hydranth 
similar to those of the Tubularidz, but with oral tentacles in two distinct 
whorls. 
Gonosome: Gonophores closely attached to hydranth body just above 
proximal tentacles. Free medusz with four radial canals, and with a single 
greatly enlarged tentacle from whose base a number of secondary medusz suc- 
cessively bud, and from these still other groups of similar meduse may arise. 
SYRACUSE UNIVERSITY. 
