OSTRACODA COLLECTED IN THE SOUTH SEA ISLANDS. 491 



Phlyctenophora (?) reniformis, n. sp. (PL I. figs. 9, 10). 



Shell, seen from the side, subreniform, greatest height situated in the middle and equal 

 to half the length. The anterior extremity is broad and well rounded, the posterior 

 rather narrower ; dorsal margin well arched, sloping gently to the front and with a steep 

 curve backwards ; ventral margin very slightly sinuated. Seen from above, the outline 

 is compressed, ovate, widest in the middle, about three times as long as broad; anterior 

 extremity acutely, posterior subacutely pointed. Shell smooth, almost colourless, slightly 

 mottled. Length *75 mm. 



A few empty shells of this species occurred in shore-sand at Loma-Loma, in material 

 from Suva mud-flats, and from the reef at Lufi-Lufi ; but the specimens have probably 

 lost their original colour, and the generic reference is doubtful. 



Genus Pontocypris, G. 0. Sars. 

 Pontocypris attenuata, G. S. Brady (Plate I. figs. 3, 4). 



Pontocypris attenuata, Brady, Ann. and Mag. Nat. Hist., ser. 4, vol. ii. p. 179, pi. iv. 6gs. 11-14. 

 ? Pontocyj/ris nitida, Brady, Linn. Soc. Jour. (Zoology), vol. xix. p. 303, pi. xxxix. figs. 4-6. 



The specimens from which this species was originally described differ from those here 

 figured both in shape and size, being considerably smaller, not so high in proportion to 

 their length, and having no posterior spine. The full-grown South Sea specimens have 

 a height more than equal to half the length, and are armed at the postero-ventral angle 

 with a single short but stout spine. The surface is very faintly punctate, and is densely 

 clothed with fine hairs. The types were taken at Mauritius, and the collections described 

 in the present memoir contain young specimens of exactly the same character. The 

 species occurred in dredgings from the port of Noumea and in shore gatherings from the 

 reef at Apia, Upolu. The length of the adult is 1*075 mm. 



A Ceylon species, described by me in the Journal of the Linnean Society as 

 Pontocypris nitida, may perhaps belong to P. attenuata, and is probably the very 

 young form of that species. 



Pontocypris gracilis, n. sp. (PL I. figs. 5,6). 



Shell, seen from the side, siliquose, much elongated, greatest height in the middle 

 and equal to less than one-third of the length, depressed and rounded in front ; posterior 

 extremity much tapered and subacute, scarcely rounded. Dorsal margin arched, sloping 

 with a gentle curve to the front and much more steeply behind; ventral margin almost 

 straight. Seen from above, elongated, ovate, about four times as long as broad, widest 

 near the middle, extremities acute. Surface of the valves quite smooth, bearing a few 

 very small, distant papillse. Length TO 7 mm. 



Habitat. — Between tide-marks, Levuka and Eambe Island. 



