OSTEACODA COLLECTED IN THE SOUTH SEA ISLANDS. 515 



Only one specimen seen, and the locality in which it occurred was, unfortunately, not 

 noted. 



Genus Asterope, Philippi. 

 Asterope cylindrica, n sp. (PI. IV. figs. 7, 8). 



Shell, seen from the side, oblong, oval, of equal height throughout, height equal to 

 two-fifths of the length. Extremities equal and well rounded, the anterior only slightly 

 sinuated below the beak ; dorsal and ventral margins quite straight. Seen from above, 

 the outline is elongated, ovate, three times as long as broad; extremities nearly equal, 

 very obtusely pointed. Surface of the valves quite smooth. Length 1*3 mm. 



Habitat. — Suva, inside reef. 



Asterope australis, n. sp. (PI. IV. figs. 1, 2). 



Shell, seen from the side, broadly ovate, rather higher behind than in front, height 

 equal to about three-fifths of the length ; extremities rounded ; notch of moderate 

 depth, beak subacute ; dorsal and ventral margins moderately and equally convex. Seen 

 from above, ovate, pointed in front, moderately rounded behind, widest in the middle ; 

 width equal to two-fifths of the length. Surface smooth. Length 2*1 mm. 



Habitat. — Noumea, dredged, 2-4 fathoms; Suva, inside reef; Mango Island, fringing 

 reef ; Apia, Upolu, reef and shore-pools. 



Genus Streptoleberis, nov. gen. 



Shell, seen from the side, elongated, flexuous ; beak much produced forwards, the 

 notch being on the ventral aspect of the shell; posterior extremity narrower, produced 

 into a pointed terminal beak. Animal unknown. 



Streptoleberis crenulata, n. sp. (PL IV. figs. 3, 4). 



Shell, seen from the side, irregularly lozenge-shaped, height equal to half the length, 

 greatest in the middle. Anterior extremity produced in the middle line into a rounded 

 beak, which is crenated at the apex ; posterior narrowed, also produced in the median line 

 into a sharp triangular beak ; dorsal margin very slightly arcuate in the middle, sloping 

 with a steep curve to the front, angulated behind, and thence sloping very abruptly to 

 the terminal beak ; ventral margin slightly convex, having a wide but shallow and 

 angular notch in front, up-curved behind to the posterior extremity. Seen from above, 

 ovate, widest near the front, width equal to about two-fifths of the length, tapering 

 rather abruptly to the front, which is sharply pointed ; posterior extremity rather 

 broadly rounded; sides sinuous. Surface of the shell covered with small, circular 

 impressions, and marked in a somewhat reticulated fashion with irregularly flexuous 

 elevated ridges. Length 1*05 mm. 



Habitat. — Noumea, dredged in 2-4 fathoms. 



