226 PROCKEDINGS OF THK MALACOLOGICAI, SOCIETY. 



meet the outer lip. Columella obliquely inserted in the umbilicus, 

 "with a small nodule at each end. Operculum circular, horny, thin, 

 multispiral, nucleus central. 



Measurements of type : Height 8, major diameter 9 mm. 



ITah. — Sunday Island, Kermadec Group. 



MONILEA INCERTA, U.Sp. PL IX, Fig. 6. 



Shell small, turbinate, thin, umbilicate ; whorls convex, graduallj;- 

 increasing, slightly flattened below the suture, last whorl rounded at 

 the periphery. Colour: generally blackish -grej' irregularly rayed 

 with white. Whorls six, the first one and a half minute, unsculptured ; 

 the sculpture consists of spiral threads increasing in number and 

 strength, the penultimate whorl having three major ones, the last 

 five above the periphery ; between these run from one to three minor 

 threads. The whole shell is overridden by very fine axial striae. 

 The base is sculptured with about twelve even-spaced ridges, similarly 

 overridden. Umbilicus narrow, bounded by a thickened rib, only 

 developed in the adult; inside white. Apeiture sub-quadrate, outer 

 lip thin. Columella ascending with a faint reflection, and liigher 

 again reflected, when a rib enters the umbilicus ; connected with the 

 outer lip by a slight callus. Operculum circular, multispiral, nucleus 

 central, thin and horny. 



Measurement of type : Height 10, major diameter 9 mm. 



Hah. — Sunday Island, Kermadec Group. 



Gena Oliver!, n.sp. PI, IX, Figs. 4, 5. 



Shell oblong ovate, small, thin, about twice as long as broad. 

 Whorls four. Colour blackish-grey, more or less marbled with lighter 

 grey and white. Sculpture consists of fine spiral grooves decussated 

 by growth-lines, but the apex has two well-developed keels which 

 are diagnostic. Columella arched. 



Measurement of type : Height 9, length 11 mm. 



Hab. — Sunday Island, Kermadec Group. 



Yanikoro Wai.lacei, n.sp. PI. IX, Fig. 11. 



Shell globose, thin, perforate, last whorl increasing and descending 

 rapidly. Whorls four. Colour white. The first whorl and a half are 

 elevated, unsculptured, the succeeding whorls bearing fine closely set 

 wavy threads, which are crossed by minute crowded strife, these last 

 predominate on the last whorl, but the whole sculpture is very fine. 

 Columella oblicjuely set, straight ; umbilicus wide and deep, bounded 

 by a crenulate rib, inside crinkled parallel to the columella ; aperture 

 semicircular, outer lip thin. Operculum horny, paucispiral, thin, like 

 that of a Mclarhaphe. This does not agree with the description of 

 the operculum of J'linikoro as given by H. & A. Adams. 



Metisurement of type : height 4, breadth 4"5 mm. 



Ifab. — Sunday Island, Kermadec Group. 



Trivia desikabilis, n.sp. PI. IX, Figs. 8, 9, 

 Shell small, sub-oval, extremities slightly produced ; white, 

 strongly sculptured. Sculpture consisting of about thirty major 



