OSTRACODA COLLECTED IN THE SOUTH SEA ISLANDS. 517 



long as broad; anterior extremity obtusely rounded; posterior tapered and subacute; 

 lateral margin very boldly convex. Surface of the shell perfectly smooth. Length 1*05 

 mm. 



Habitat. — Port of Noumea, 2-6 fathoms. 



Sarsiella rudis, n. sp. (PI. IV. figs. 5, 6). 



Shell, seen from the side, subcircular, with a prominent median beak ; height and 

 length (exclusive of the beak) about equal. Anterior margin rounded, rather flat above 

 the middle, posterior flattened and sloping steeply above the beak, sinuated below ; dorsal 

 margin flattened, almost straight ; ventral boldly convex. Seen from above, the outline 

 is hexagonal, with parallel, straight sides converging abruptly and equally to the ex- 

 tremities, which are rather wide and obtuse ; width equal to two-thirds of the length. 

 Surface of the shell devoid of regular sculpture, but vaguely ridged and undulated. 

 Length '84 mm. 



Habitat. — Eambe Island, between tide-marks ; Suva, shallow water inside reef. 



Sarsiella foveata, n. sp. (PI. I. figs. 21, 22). 



Shell, seen from the side, almost circular, with a prominent beak ; height equal to 

 about six-sevenths of the length (exclusive of the beak). Anterior extremity rounded, 

 slightly prominent about the middle, posterior also rounded ; beak large, equal to one- 

 fourth of the height of the shell, truncated at the apex ; dorsal and ventral margins boldly 

 convex, dorsal sloping with a gentle curve towards the hinder end, ventral curve much more 

 abrupt and almost angulated behind. Seen from above, the outline is elongated, sub- 

 hexagonal, widest behind the middle, width equal to half the length ; anterior extremity 

 broad and rounded, emarginate in the middle ; posterior sharply pointed ; the sides con- 

 verge gradually from their widest point towards the front ; backwards the convergence is 

 much more abrupt and sinuous ; the whole circumference is much jagged. End view 

 subquadrangular, constricted in the middle. Shell-surface marked throughout with large 

 and sharply-cut, deep, angular excavations; valves protuberant behind the middle, and 

 forming towards the ventral margin an angular prominence. Length 1 *3 mm. 



Habitat. — Banc de 1' Aiguille, Noumea, 2-3 fathoms. One specimen only seen. 



Section III. PLATYCOPA. 



Fam. Cytherellid^e. 



Genus Cytherella, Jones. 



Cytherella semitalis, G. S. Brady. 



Cytherella semitalis, Brady, "Ostracoda of Challenger Expedition," p. 175, pi. xliv. fig. 2 a-e. 

 Habitat. — Port of Noumea, 3-6 fathoms ; Suva-Suva Bay, Vanua Levu, 4 fathoms. 



