THE STARFISHES OF THE HAWAIIAN ISLANDS. 
1109 
ture consists of a single large, perpendicular spine, which at about the middle of the genital inflation 
measures 4 to 4.5 mm. in length. Base of spine is cylindrical or very slightly tapering, but the distal 
half is compressed and the tip truncate, often slightly flaring. Sometimes a groove runs along outer 
part of spines; or two parallel grooves are present. Less commonly the tip is bifid for a millimeter. 
Beyond genital inflation the spines rapidly become much slenderer and tapering, the chisel-like 
character being lost; and on the outer half of ray they are quite delicate and about 2.25 to 2.5 mm. 
long. The outer side of large spines is covered by membrane, beset with numerous microscopic pedi- 
cellarise, which are also present on outer face of the adambulacral plates. Furrow side of both spines 
and plates is devoid of pedicellarise. The smaller spines bear a flap of membrane beset with numerous 
pedicellarise. 
Actinostome wide, its diameter 15 to 18 mm. (diameter of disks 27 to 30 mm.). Peristomial 
membrane thin, semitransparent. Mouth plates with lateral process extending across mouth of 
ambulacral furrow and meeting a similar expansion from the opposite plate, thus roofing over the 
proximal end of the radial nerve. The two processes, which are at the inner end of their respective 
plates, sometimes, but not usually, ankylose. A small spinelet is borne on the end of this lateral 
process. Three other subequal, short, round-tipped mouth spinelets are present on the free (actino- 
stomial) margin of each plate, the inner at a distance nearly equal to its own length from the median 
sutural line. All bear near the tip a small tuft of minute pedicellarise attached to an insignificant 
membrane. On actinal surface at aboral end of plate is a single spinelet similar to but a trifle larger 
than the marginal spinelets. The furrow margin of each mouth plate is deeply excavated to accom- 
modate the first pair of tube feet. 
Madreporic body rather small, subtubereular, situated on the rounded margin of the disk. Stri- 
ations few, coarse, radiating. 
Color in life, yellowish pink. 
Localities: Type (no. 21190, U. S. National Museum) from station 3828, south coast of Molokai 
Island, 319 to 281 fathoms, broken shells and gravel; bottom temperature, 43.8° F. Taken also at 
station 3992, vicinity of Kauai Island, 528 fathoms (approximately), fine gray sand and mud; bottom 
temperature, 39.6° F. ; 2 specimens in all. 
There are four other known species of this genus, all from the Atlantic: Odinia elegcms Perrier, 
0. robusta Perrier, and 0. semicoronata Perrier from off the coast of Morocco, and 0. pandina Sladen 
from the Faroe Channel. 0. pacifica is thus the first member of the genus to be taken in the Pacific 
Ocean. It approaches, most nearly, 0. pandina and 0. robusta , but is less spiny than either of these 
forms, although quite as large. The skeleton of the basal portion of arms and disk is well developed. 
The depth given for the second station at which this species was captured is probably too great. 
The trawl encountered a soft, muddy bottom, and it was estimated that the net was dragged at depths 
between 500 and 400 fathoms. 
Genus BRISINGA Asbj0rnsen. 
Brisinga Asbjprnsen, Fauna Litt. Norvegiae, 1856, Andet Hefte, p. 95. Type Brisinga endecacnemos Asbjprnsen. 
Key to Hawaiian species of Brisinga. 
a. Adambulacral armature prominent, crowded. Lateral spines stout and long. 
b. Rays 14. Disk large; annular ridges very numerous, close together; 2 or 3 prominent actinal 
adambulacral spines panopla 
bb. Rays 9. Difek small; annular ridges not so numerous, or close together alberti 
aa. Adambulacral armature much less crowded. 
b. Rays 15. Size large; disk large; annular ridges not very numerous, nor close together 
/.. evermanni 
bb. Rays 10. Disk rather small, thin. Rays delicate, spines weak. Annular ridges rather close 
together, numerous and prominent. Prickles absent from abactinal membrane of rays. 
fragilis 
Brisinga panopla, new species. 
PI. XLIII, fig. 3; pi. XLIV; pi. XLV, fig. 3; pi. XLVII, figs. 2, 2a-f. 
Rays 14. R = 235 mm., approximately; r = 13 rum. R= 18 r approximately! Depth of disk, 
7 mm. ; breadth of ray at base, 7 mm. ; breadth at widest part of genital inflation, about 10 mm. ; at 
middle of ray, 6 mm. 
