OSTRACODA COLLECTED TN THE SOUTH SEA ISLANDS. 503 



median line, then sloping sharply backwards and forming a wide acutely-pointed process. 

 Shell-surface covered with irregularly shaped, rather large pits, central portion very 

 tumid towards the ventral margin. Length '77 mm. 



Two or three specimens only were found between tide-marks at Vuna Point, Taviuni, 

 Fiji. 



Cythere labiata, n. sp. (PI. II. figs. 20, 21). 



Shell, seen from the side, oblong, subquadrangular, highest in front, height equal to 

 more than half the length. Anterior extremity well rounded, crenated ; posterior only 

 moderately rounded, obscurely angulated above, rounded off below, bordered with 

 strong teeth, which are longest below the middle ; dorsal margin forming an angular eleva- 

 tion in front, thence sloping gently in a broken, tuberculated line backwards ; ventral 

 straight, rounded off at each extremity, divided into closely-packed, rounded teeth. 

 Seen from above, oblong, twice as long as broad, scarcely at all tapered at the extremities, 

 which are wide and truncated ; edges everywhere much broken and toothed. The 

 surface of the valves is tuberculated indistinctly for the most part, but on the posterior 

 half shows an imperfectly linear arrangement of some of the tubercles ; the central 

 area is moderately convex, and is separated from the surrounding dentated margin by a 

 shallow furrow, extending round the shell, except on the dorsal margin ; the hinge-tubercle 

 very large. Length 7 mm. 



Habitat. — Levuka, Fiji, between tide-marks. One specimen only. 



Cythere ichthyoderma, n. sp. (PL II. figs. 22, 23). 



Shell oblong, subquadrangular, highest over the anterior hinge, height equal to half 

 the length. Anterior extremity well rounded, posterior subtruncate, only slightly 

 rounded, much narrower than the anterior ; dorsal margin forming a hump over the 

 anterior hinge, thence sloping gently and almost in a straight line backwards ; ventral 

 straight. Seen from above, compressed, subovate, nearly thrice as long as broad, with 

 very wide, equal, truncated extremities ; for the greater part the sides are nearly parallel, 

 but at a short distance from each extremity they slightly converge. The surface of the 

 valves is smooth, forming a convex area, encircled on all sides, but more especially in 

 front and behind, by a wide, thickened lip. In well-marked specimens the central area 

 shows, running obliquely across it in a longitudinal direction, two narrow squamous or 

 tuberculated ridges, but one or both of these may be very faintly marked or even altogether 

 wanting. The margins are dentated or spinulose at almost all points, except at the anterior 

 part of the dorsum, just behind the hinge-tubercle ; on the anterior and posterior margins 

 the teeth are generally short and blunt, and point .directly forwards and backwards ; while 

 on the dorsal and ventral margins they are squamous in character, and have their points 

 directed backwards. Length '77 mm. 



Habitat. — Port of Noumea, 3-6 fathoms; Suva, mud-flats and inside reef; Sava-Sava 

 Bay, Vanua Levu, 4 fathoms ; Vuna Point, Taviuni, between tide-marks ; Rambe Island, 

 between tide-marks ; Lufi-Lufi, Upolu, reef and shore-pools. 



