952 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
cine pair originating near the top of hydrothecse, a mesial one at base of each hydrotheca, and another 
in the middle of each .intermediate internode; a pair of cauline nematophores in the axil of each 
hydrocladium, and others irregularly placed on the stem. 
Gonosome. — Gonangia very long, slender, delicate, curving gently at distal end and tapering grad- 
ually to the round terminal aperture. The gonangia are not in an upright position, as in allied species, 
but project so as to be parallel -with the Jhydrocladia. 
Locality. — Station 4098, north coast of the island of Maui, 95 fathoms. 
This species is unique, I believe, in the regularly horizontal position of the gonangia. 
Genus MONOSTIECHAS. 
Trophosome. — Colony branched, the hydrocladia being borne on the upper sides of the branches. 
No cauline nematophores. 
Gonosome. — Gonangia ovate, without protective branches of any kind. 
Monostaechas quadridens (McCrady). 
Distribution. — Station 3854, south coast of the island of Molokai, 134 fathoms; station 3859, 
between the islands of Molokai and Maui, 138 fathoms. 
I am unable to separate these specimens from others from our Atlantic coast, the only perceptible 
difference being somewhat shorter nematophores in the specimens from the Hawaiian region. 
Plumularia quadridens McCrady, Gymnophthalmata of Charleston Harbor, 1857, 97. 
Monostaechas fisheri Nutting, new species. 
(PI. v, : fig. 3; pi. xii, fig. 8.) 
Trophosome. — Colony growing from a straggling root-stock and attaining a height of three-quarters 
of an inch. Stem monosiphonic, smooth, with distinct but irregular nodes. Branches sometimes 
alternate and sometimes opposite, but always on opposite sides of the stem. Hydrocladia arising 
from upper sides of branches, divided into regularly alternating hydrothecate and intermediate inter- 
nodes of nearly equal length; nodes alternately straight and oblique, the former being above and the 
latter below the hydrothecse. Hydro thecae very large for this group, cup-shaped, thin- walled, with a 
slightly flaring margin and the adcauline wall almost entirely free from the hydrocladium. There 
are no cauline hydrothecse. Supracalycine nematophores borne on very slender horn-like processes 
from the hydrocladium; 2 mesial nematophores to each intermediate internode, and 2 (1 immediately 
above and 1 below the hydrotheca) on each hydrothecate internode. 
Gonosome. — Gonangia borne on the hydrocladia at bases of hydrothecse, obovate in form, as in 
M. quadridens. 
Distribution. — Station 3936, off Laysan Island, 79 to 130 fathoms; station 3949, off Laysan Island, 
59 to 152 fathoms; station 4072, northeast coast of the island of Maui, 56 fathoms. 
The hydranths of this species are colored almost black by a dark pigment resembling that found 
in many species of Lytocarpus. 
Genus ANTENNELLA. 
Trophosome. — Colony consisting of hydrocladia springing direct from a creeping root-stock, with- 
out a true stem. Hydrocladia and hydrothecse as in the preceding genus. 
Gonosome. — Gonangia pyriform, aperture distal, round. 
Antennella complexa Nutting, new species. 
(PI. v, fig. 4; pi. xii, fig. 9.) 
Trophosome. — Colony sometimes attaining a height of about 4 inches. Creeping root-stocks inter- 
twined so as to resemble closely a fascicled stem from which the hydrocladia arise in great profusion, 
but with no regularity of arrangement whatever. All of these parallel root-stocks bear hydrocladia 
and are closely appressed to each other, but are easily separated with the needles. 
Hydrocladia disposed on all sides of this pseudo-stem, divided into alternating hydrothecate and 
intermediate internodes of approximately equal length, although there is much variation in this 
