SEA LILIES, STARFISHES, ETC.—CLARK. 75 
Family BRISINGID. 
Genus OprntA, Perrier. 
ODINIA AUSTRALIS,! sp. nov. 
(Plate xxvii., fig. 1-2.) 
heaysel4. i100 mm. :) r—8 mm; KR l2-o9r,) (Br= 
2.5mm. Br where arm is widest (about 13 mm. from centre 
of disk) 5 mm.; at middle of arm, about 2 mm. Disk dis- 
tinctly elevated above arm-bases, thickly plated, the plates 
without any definite arrangement but bearing minute pointed 
spinelets and countless pedicellariz ; papule very numerous, 
but usually, if not always single. Bases of arms, connected 
by marginal plates for only 2-3 mm. beyond the disk. Arms 
narrow at base, then suddenly swollen and often about 10mm., 
gradually but quickly returning to the same width as at base ; 
as far as they are swollen, they are covered by plates, spinelets, 
papule and pedicellariz like the disk, but beyond the swelling 
a thin skin crowded with minute pedicellariz is their only 
‘covering. Along each side of arm is a series of vertical plate- 
groups (apparently not more than 3 plates to a group distally), 
occurring at intervals of 2-3 mm. or about 3 adambulacral 
plates; on the swollen basal portion of arm these series 
extend to medioradial line and the two of opposite sides may 
unite to form a very narrow band across the arm, but these 
bands are often incomplete, much bent or otherwise irregular ; 
they are faintly indicated distal to the swollen region but only 
for a short distance. The first 2 or 3 of these bands carry no 
spines, only acute, conical spinelets dorsally like those on the 
neighbouring abactinal plates, but on the third or fourth 
band, the lowest plate (adjoining the adambulacral) carries 
a spine about a millimeter long ; on succeeding bands this 
spine increases in length and at the middle of the arm and 
beyond is 4 mm. long; on the fifth or sixth band a second 
spine, just above the first appears and it too increases in length 
but never quite equals the first ; on the seventh or eighth 
vertical group (corresponding to the “ bands ’’) a third spine 
appears but this remains distinctly shorter than the other 
two ; in life, these spines are apparently covered with a loose 
membrane, which is densely clothed with minute pedicellariz, 
but after capture, probably owing to the rough journey in the 
trawl, much of this membrane is commonly wanting. Adambu- 
lacral plates rather longer than broad ; at base of arm, their 
armature consists of two spines, a very slender, acicular spine 
‘on the aboral end of the plate, with 2-3 minute pedicellarie 
1. Australis=southern ; in reference to its being the first species of the 
-genus to be taken in the Southern Hemisphere. 
