438 On Mollusca from the Island of Beilan-Beilan. 



suture well impressed, coarsely crenellated by the termina- 

 tions of the transverse costulse; columella obliquely descending, 

 bearing- somewhat interiorly a small downwardly directed 

 denticle in its median part, and spreading- above into a thick, 

 well-defined, parietal callus, which reaches the upper margin 

 of the labrum and gives to it a subcontinuous appearance ; 

 labrum triple, outwardly expanded and reflexed, the inner 

 margin somewhat minutely granular ; aperture circular, pale 

 yellow ; operculum unknown. 



Alt. 2*5, diam. maj. 1*25 (nearly) mm. 



JJab. Island of Beilan-Beilan, to the north of the Obi 

 Islands, Dutch East Indies (Mr. Diepenheim). 



Palaina beilanensis, sp. n. 



Shell (as seen under a 1-inch objective) minute, rather 

 shortly cylindrical, yellowish brown ; whorls 5, the first very 

 small, the second proportionately large, the third and fourth 

 regularly increasing, the last somewhat decreasing both in 

 length and breadth, the first three smooth, the last two 

 obliquely costulate; suture impressed ; peristome continuous, 

 laminiferous, outwardly expanded, and reflexed, bearing two 

 laminiferous ridges on the whorl immediately behind ; 

 aperture large, circular ; operculum unknown. 



Alt. 2, diam. maj. 1 mm. 



Hab. Island of Beilan-Beilan, to the north of the Obi 

 Islands, Dutch East Indies (Mr. Diepenheim). 



Diancta diepenheimi, sp. n. 



Shell (as seen under a 1-inch objective) cylindrical, but 

 for the last whorl, yellowish flesh-colour; whorls 7, the first 

 two very small, the third and fourth large in proportion and 

 rapidly increasing, the fifth and sixth rapidly increasing in 

 length but not in breadth, the seventh much smaller, con- 

 tracted, and towards the aperture rapidly forsaking the 

 direction of the axis of the shell, the two apical whorls 

 smooth, the remainder obliquely and slightly distantly costu- 

 late, the interstices sculptured with fine, wavy, spiral stripe ; 

 suture impressed; labrum continuous, tinged with a reddish- 

 golden line, the inner margin erect, the outer outwardly 

 expanded and reflexed; aperture circular; operculum un- 

 known. 



Alt. 3*5 (nearly), diam. maj. 1*5, diam. min. 1 mm. 



Aperture: alt. "75, diam. *75 mm. 



Hab. Island of Beilan-Beilan, to the north of the Obi 

 Islands, Dutch East Indies (Mr. Diepenheim). 



