HYDROIDS OF THE HAWAIIAN - ISLANDS. 
949 
II 
Distribution.— Station 3818, off Diamond Head, near Honolulu, 293 fathoms; station 3854, south 
coast of Molokai, 134 fathoms; station 3863, between the islands of Molokai and Maui, 127 fathoms; 
station 3968, near French Frigate Shoal, 14 % fathoms; station 4101, between the islands of Molokai and 
Maui, 143 fathoms; station 4102, between the islands of Molokai and Maui, 122 fathoms. 
I ll i Sertularella dentifera Torrey, Hydroids of the Pacific coast of North America, 61, 1902. 
Sertularella torreyi Nutting, new species. 
(PI. iv, fig. 4; pi. xi, figs. 2, 3.) 
, Trophosome. — Colony (incomplete) attaining a height of about 2 inches. Stem not fascicled, 
divided into regular internodes each of which bears a branch and 2 hydrothecae on one side and a 
single hydrotheca on the other. Branches regularly alternate, not divided into internodes. Hydro- 
thecae immersed nearly to their apertures, moderately distant; margins with 2 opposite lateral teeth 
and hardly a sign of the other 2; valves of the operculum not constant in number. 
Gonosome. — Gonangia borne on main stem, very deeply urceolate, with slightly flaring, campanu- 
late margin marked by a series of broad sinuations which correspond to broad, shallow longitudinal 
corrugations reaching from the margin about halfway down the sides of the gonangia. Aperture 
! exceedingly broad, sometimes furnished with a membranous operculum which is irregularly ruptured 
for the escape of the sexual elements. 
Distribution. — Station 3949, south coast of the island of Molokai, 70 fathoms; station 4003, off the 
island of Kauai, 751-406 fathoms. 
The gonangia of this species are of very exceptional form for the Sertularida?. I know of no 
other species of Sertularella with this type of gonangia, a type not infrequently found among the 
Campanularidae. 
Sertularella crenulata Nutting, new species. 
(PI. iv, fig. 3; pi. xi, figs. 4-7.) 
Trophosome. — Colony about 3 inches high. Stem and proximal part of main branches fascicled, 
distal parts of branches monosiphonic. Branches alternate, moderately geniculated. Hydrothecae 
rather long, curving gently outward and ending in a square margin and a 4-flapped operculum. The 
whole body of the hydrotheca is closely and evenly annulated with fine rugosities which are clear-cut 
and evenly distributed, making a very striking and beautiful ornamentation. 
Gonosome. — -Gonangia oval, strongly annulated throughout, and with an aperture surrounded by 
4 unequal points or teeth. The gonangia are aggregated on the distal parts of the colony. 
Distribution. — Station 3848, south coast of the island of Molokai, 44 fathoms; station 3854, south 
coast of Molokai, 134 fathoms. 
This is a very striking and beautiful species, and is more closely annulated than any other of the 
genus that I have seen. 
Genus PASYTHEA. 
Trophosome. — Hydrothecse strictly opposite, arranged in groups of pairs, a group to an internode, 
the upper pair being smaller and differing in shape from the lower; margin bilabiate, with a 2-flapped 
operculum. 
Gonosome. — Gonangia oval, aperture large, collar round and narrow. 
Sertularia quadridentata, Ellis & Solander, Nat. Hist. Zooph., 1786, 57. 
Pasythea quadridentata Ellis and Solander. 
Specimens of this widely distributed species were taken at station 3968, where the depth was 141- 
fathoms, but as they were attached to pelagic algae they probably came from the surface. The station 
was near French Frigate Shoal. 
Genus THUIARIA. 
Trophosome. — Hydrothecse subopposite to alternate/more than two to an internode, margin smooth 
or with 1 or 2 teeth, operculum with 1 abcauline flap (very exceptionally with 2 flaps). Hydrothecse 
usually more or less immersed. 
Gonosome.—' Gonangia oval, with large terminal aperture, and with 1 or 2 spines or horns at the 
shoulders. 
