REPORT ON THE OSTRACODA. 129 



widest in the middle, tapering equally to the extremities, which are pointed ; width equal 

 to the height ; end view subcircular, scarcely at all tapered towards the apex. Surface of 

 the shell smooth, marked with numerous small circular papillte and with irregular light 

 or dark coloured blotches. Length, l-43d of an inch ('57 mm.). 



Found in a dredging from Nares' Harbour, Admiralty Islands, in a depth of 16 

 fathoms. This has very much the general aspect of Loxoconcha, but there is no angula- 

 tion at the supero-posteal portion of the margin, and on that account chiefly I think it 

 is best referred to Xestoleberis. 



[PL XXXI. fig. 4, a-d. a Carapace seen from left side, b from above, c from below, 

 d from front. Magnified 50 diameters.] 



11. Xestoleberis variegata, n. sp. (PL XXXI. fig. 8, a-g). 



Carapace of the female, tumid ; seen from the side, broadly pear-shaped, highest near 

 the middle, extremities well rounded, the anterior, however, much narrower than the 

 posterior ; dorsal margin boldly arched, ventral sinuated in front, and convex behind the 

 middle ; seen from above, broadly ovate, tapering, and pointed in front, rather broadly 

 rounded behind, width scarcely equal to the height ; end view subcircular. Surface of 

 the shell smooth, variegated with blotches of dark upon a pale ground. Length, 

 l-43d of an inch ('57 mm.). Specimens which I believe to belong to the male of this 

 species are represented in figures c-g, and, as usual, are more elongated and slender than 

 those of the opposite sex. 



Xe-stol-eberis vanegata was noticed in dredgings from ofi' St Vincent, Cape Verde, in 

 1070 to 1150 fathoms (Stations 93, 94) ; and ofi" Tongatabu, 18 fathoms (Station 172). 



[PL XXXI. fig. 8, a-g. a Carapace of female, seen from left side, b from above, c 

 from below, d from front, e male seen from left side, / from below, g from front. All 

 magnified 50 diameters.] 



12. Xestoleberis expansa, n. sp. (PL XXX. fig. 3, a-d). 



Carapace excessively ventricose ; seen from the side, oblong, suljovate, highest a little 

 behind the middle, extremities broad and rounded, dorsal margin boldly arched, some- 

 what gibbous, ventral nearly straight ; height equal to two-thirds of the length ; seen 

 from above, very broadly ovate, greatest width situated in the middle, and equal to three- 

 fourths of the length, abruptly tapered towards the anterior extremity, which is subacute ; 

 posterior extremity broadly rounded, and slightly emarginate in the middle ; end view 

 Rubtriangular, widest at the ventral margin, width much greater than the height, apex 

 acute, lateral angles rounded. Surface of the shell smooth and polished. Length, 1-5 8th 

 of an inch ("44 mm.). 



One specimen only, dredged in a depth of 1900 fathoms, in lat. 35° 39' S., long. 

 •50° 47' W. ; grey mud -(Station 323). 



(ZOOL. CHALL. EXP. PART 111. — 1880.) C 17 



