1134 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Kaiwi channel. This species has been taken by Agassiz and Mayer in the Ellice and 
Fiji islands. 
Four large but badly broken specimens of Eutima were taken by the Albatross 
at station 4010, on the surface between Kauai and Oahu, on June 20. They appear to 
belong to a new species peculiar to Hawaii, but their state of preservation is such as 
to render accurate description impossible. 
Among the Siphonophorse obtained in the Hawaiian Islands by the Albatross are 
Diphyopsis angustata , Abyla hvxleyi , Physalia tctriculus, Porpita pacifica, Yelella 
pacifica , and an Agalma too broken for specific determination. Among these all but 
the last named are certainly of wide distribution over the tropical Pacific. 
The Ctenophorse are represented by Ilormiphora fusiformis, found also in the 
Marquesas and Paumotu islands, and a Beroe apparently identical with B. australis 
Agassiz and Mayer, from the Ellice and Fiji islands. 
On the whole it appears that the medusa fauna of the Hawaiian Islands is mainly 
an insular one, recruited from forms capable of extensive distribution. The isolation 
of the islands and the relative smallness of their coastal areas have probably hindered 
the development of any considerable number of species peculiar to the locality. 
It is remarkable that no Rhizostomse were found in Hawaiian waters, although 
these Scyphomedusse are very characteristic of Fiji, Australia, and the Malay Archi- 
pelago. Bigelow (1904, p. 248), however, calls attention to the fact that they are not 
commonly found among the Maidive Islands. 
DESCRIPTION OF SPECIES. 
SCYPHOMEDUSH. 
Genus CHARYBDEA Peron et Lesueur, 1809. 
Charybdea, Haeckel, Syst. der Medusen, p. 439, 1880. 
Generic characters: Cubomedusse with 4 simple interradial tentacles, with pedalia. The velarium 
is suspended by 4 radially situated bracket-like f renulse from the walls of the subumbi'ella. V elar canals 
are found extending from the gastro-vascular space of the medusa into the entodermal lamella of the 
velarium. The stomach is wide and flat without wide mesenteries. There are 4 clusters of gastric 
cirri situated in the interradial angles of the stomach cavity. 
Charybdea rastonii Haacke 
PI. i, figs. 1-lc. 
Charybdea rastonii Haacke, W., Jena. Zeitschrift, 1887, p. 599, taf. 35, 15 fig. 
Specific characters: The bell is nearly cubical, with flat top and almost plane sides. It is about 
35 mm. high and 30 mm. wide. The 4 interradial pedalia are small, being only about 10 mm. long 
and 6 mm. wide. Each pedalium is hollow, and gives rise to a hollow tentacle, which is about 50 mm. 
long and closely ringed with nematocyst swellings. These tentacles taper gradually from base to 
tip, and are very flexible. There are four short club-like sense organs, alternate in position with the 
four tentacles, each sense organ found within a niche about 5 mm. above the level of the velarium, and 
knob-shaped with a short stalk. The sensory knob is provided with an entodermal otolith and 6 
ectodermal eyes. Two of these eyes are large and median, and provided each with a doubly convex 
lense, while the other 4 eyes are small and lateral and are little more than ocelli. All of the eyes are 
directed inward, so as to view objects within the bell. (Figs, lb, lc, pi. i. ) 
The velarium is wide, and is suspended by 4 radial mesenteries, or bracket-shaped frenulse. Six- 
teen short, non-anastomosing velar canals extend inward into the substance of the velarium. (Fig. la, 
pi. i.) There are 4 short interradial regions in the corners of the stomach, where one finds many 
