374 PROCEEDINGS OF THE ACADEMY OF [NoV., 



whorls brown, high conic, the first smooth, the others having 3 spiral 

 cords. The next two whorls have very strong retractive ribs nearly 

 as wide as their intervals, crossed by spiral cords which bead the 

 ribs. On the first post-nepionic whorl I count 13 ribs; on the second 

 there are about 9 cords, and the ribs become very low, fading out, 

 on its last third. The last 13^ whorls have a close sculpture of 

 slightly unequal spiral threads; lines of growth are scarcely visible. 

 The umbilicus is funnel-shaped, rather weakly axially plicate within, 

 its margin smooth and rounded. The apertui-e is oblique, semi- 

 circular, the inner border slightly concave. 



Length 5.5, diameter 5.4 mm., 3J^ post-nepionic whorls. 



Hilo, Hawaii; Kaneohe Bay, Oahu; Haena, Kauai. 



Type 116963 A. N. S. P. 



Fig. 10 — Vanikoro hawaiensis. 

 Vanikoro kanakarum n. sp. 



Shell openly umbiHcate, subglobose, with a short, conic spire and 

 slightly obtuse apex; white, the apex brown. The embryonic and 

 nepionic shell is semiglobose, of little more than one whorl, and 

 smooth. Retractive ribs then set in, continuing for two whorls; 

 their intervals are a little wider than the ribs, and crossed by about 

 10 spiral cords. The adult sculpture abruptly replaces this ribbed 

 neanic stage. It consists of spiral threads, between which there are 

 one to three finer threads. Lines of growth are scarcely noticeable. 

 The umbilicus is funnel-shaped, slightly plicate inside, bounded by 

 a nearly smooth rib, but slightly prominent. The aperture is semi- 

 circular. 



Length 3.7, diameter 4 mm.; 3}4 post-nepionic whorls. 



Haena, Kauai. 



The shape of the shell, in the floating stage, differs entirely from 

 that of V. hawaiensis. The ribbed neanic stage is longer. The type 



