22 ‘* ENDEAVOUR” SCIENTIFIC RESULTS. 
Family COLOBOMETRID. 
Genus OLiGoMETRA, A. H. Clark. 
OLIGOMETRA THETIDIS, H. L. Clark. 
Oligometra thetidis, H. L. Clark, Mem. Austr. Mus., iv., 11, 
1909, p. 522. 
These two specimens are uniformly yellowish in alcohol 
and show no noteworthy peculiarities. 
Loc.—Kastern Slope, Bass Strait. 
OLIGOMETRA ZEBRA,! sp. nov. 
(Plate IT., fig. 2.) 
Disk wanting ; arms about 70 mm. long. Centrodorsal, 
3 mm. in diameter, markedly concave. Cirri in a single, 
crowded, fairly regular marginal series of about 20, 
12-13 mm. long, each with 27 or 28 segments; all 
segments wider than long; basal ones nearly square 
but distally each successive segment becomes more com- 
pressed, ventrally rounded, and dorsally transversely 
ridged ; transverse ridges never conspicuous, but more 
evident on the last four serments (not counting the claw), 
especially on the penultimate, where it forms a well-marked 
opposing spine. IBr series not peculiar, the synarthrial 
tubercle, however, being quite distinct ; the axillary is nearly 
twice as wide as high; the adjoining rays are well separated 
from each other. Arms 10; brachials at first quadrilateral, 
becoming triangular, and then near tip of arm again quadri- 
lateral ; synarthrial tubercle of 2 and 3 well-marked ; neither 
distal margins nor distolateral angles peculiar, though the 
latter are evident enough, especially on terminal half of arm ; 
general contour of arm quite smooth. 
P,; about 7 mm. long, of 18 segments, not at all rigid or 
otherwise peculiar ; the basal 6 or 7 segments are wider than 
long while the succeeding are squarish, or a little longer than 
wide; the oral margins of the lower segments are barely 
produced into one or two minute spines, while the aboral 
margins are inconspicuous, flattened and a trifle roughened ; 
segments 8-12 are somewhat prismatic and the remaining 
segments are distinctly flattened. P, is 9mm. long, with 18-20 
segments ; it is very similar to P; but is evidently stouter and 
is clearly the largest pinnule on the arm ; the oral margins of 
1. Zebra, a Latinised form of the native name of the well-known Arata 
quadruped ; in reference to the colouration of the arms. 
