Mollusca from the Island of Beilan-Beilan. 435 



Alt. 1, diam. niaj. 1'5 mm. 



llal>. Island of Beilan-Beilan, to the north of the Obi 

 Islands, Dutch East Indies [Mr. Diepenheim). 



Wilhelminaia minuscula, sp. n. 



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

 turbinate, reddish brown, somewhat shining; whorls 4, regu- 

 larly increasing, sculptured with extremely tine, wavy, spiral, 

 punctate striae crossed by fine transverse stria) ; suture im- 

 pressed, margined beloio ; perforation reduced to a mere 

 chink ; columella vertically descending above, then angled 

 and very oblique below, outwardly dilated; labium simple ; 

 aperture very oblique, sublunate. 



Air. '5, diam. maj. 1 mm. 



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

 Islands, Dutch East Indies (Mr. Diepenheim) . 



The species is, in many respects, a miniature of IF. ma- 

 th < Idee. 



Opeas diepenheimi } sp. n. 



Shell (as seen under a 1-inch objective) imperforate, fusi- 

 formly cylindrical, with obtuse apex, yellowish white ; 

 whorls 6, the first much flattened above, the second very large 

 in proportion, the remaining four convex, the apical whorls 

 shining, sculptured with exceedingly fine, wavy, spiral stria?, 

 the later whorls closely and finely transversely costulate ; 

 suture well impressed ; columella vertically descending 

 above, obliquely below, slightly bulging in the median part, 

 narrowly outwardly reflexed, and diffused above into a narrow, 

 somewhat restricted, and moderately well-defined parietal 

 callus which reaches to the upper margin of the labrum ; 

 labium acute, a little dilated below, bent slightly inwards 

 over the aperture above ; aperture inversely auriform. 



Alt. 5, diam. maj. 2 mm. 



Aperture : alt. 1*5, diam. "5 mm. 



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

 Islands, Dutch East Indies (Mr. Diepenheim). 



IIendrikia, subgen. n. (Scarabus). 



[Shell minute, narrowly perforate, with excentric, mamillary, 

 corneous, nepionic whorls, of which the second is densely 

 spirally pitted. 



Hab. Moluccas. 



Genotype. //. mirifica, Preston. 



