22 " ENDEAVOLTR " SCIENTIFIC RESULTS. 



Family COLOBOMETRID.E. 

 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. — Eastern Slope, Bass Strait. 



Oligometra zebra, i sp. nov. 

 (Plate II., 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 segments (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 disto lateral angles peculiar, though the 

 latter are evident enough, especially on terminal half of arm ; 

 general contour of arm quite smooth. 



Pi about 7 mm. long, of 18 segments, not at all rigid or 

 otherwise pecuHar ; 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 inconsi)icuous, flattened and a trifle roughened ; 

 segments 8-12 are somewhat prismatic and the remaining 

 segments are distinctly flattened. Pg is 9 mm. long, with 18-20 

 segments ; it is very similar to Pi 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 African 

 quadruped ; in reference to the colouration of the arms. 



