162 DIJ. O. r. vox MOELLENDORFF ON [Feb. 20, 



18. Hypselostoma striolatum, sp. nov. 



Owing to the bad state of preservation of the two specimens 

 of this form, quite distinct from the preceding one, J cannot give 

 a complete description of it. Its last whorl is much more detached 

 than in H. transitans and distinctly bent upwards, and shows very 

 distinct though minute spiral lines. The diameter is only 2*5 millim. 

 It belongs to the group of H. bensonianum and H. hungerfordianum. 



Fam. AsicuLiD^. 



19. Truncatella valida, Pfr. 



20. Truncatella semicostata, Mouss. 



Fam. Cyclophorid.?:. 



21. Opisthopoeus setosus, sp. nov. (Plate XVI. figs. 14, 15.) 



T. latissime umhilicata, discoidea, tenuis, fran.tverse confertim 

 costulato-striata, setis hrevihus densis deciduis hirsuta, olivaceo- 

 cornea ; spira vix jJromimda, apice suhmucronaio. Anfr. 4|, 

 teretes, sutura profunda disjuncti ; vltimus paullwn descendens, 

 pone aperturam tubuhim siituralem brevem ad anfracfum pen- 

 tdiimvm recurvatmn gerens, turn subsohdus. Aptertxira sat 

 obliqua, subcircularis; peristoma duplex, internum tenue, breviter 

 porrectum, externum expansum, campanidatum, superne ad 

 insertionem breviter auriculatum. Opercidum ext us fere planum, 

 lamina calcarea anfr. 8 transverse costido-striaiis, sulco sat 

 profunda ab interna tenui cornea separata. 



Diam. maj. 14, mhi. 10"5, alt. 5-5 millim. 



Forma conoidea : minor, arctius umbilicata, spira magis elevata, 

 anfract^is ultimus magis descendens, longius solutus. 



Diam. 11'5, alt. 7 millim. 



In size and general outline this species agrees somewhat with 

 0. cornicidum of Java, but the spire is still flatter, the position of 

 the sutural tube is different, aud the hirsuteness distinguishes it 

 from the Javan and from all other known Opisthopori. 



22. Ehiostoma housei, Haines. 



Three specimens of a fine large Bhiostovia agree very well with 

 the diagnosis of this iSiamese species, of which I cannot compare 

 either examples or figures. The largest specimen measures 28 

 millim. in diameter and is 16-5 high, the operculum is 8-5 millim. 

 wide, 3 high. 



23. Ehiostoma a siphon, sp. nov. (Plate XVI. figs. 16, 17.) 



T. late et perspective umbilicata, convexo-depressa, solida, transverse 

 plicato-striatula, cinerascenti-brunnea, interdum indistincte mar- 

 morafa et tceniata ; sjnraparum elevata, apicesubacuto. Anfr. 

 5, perconvexi ; ultimus antice solutus et dejlexus, in parte soluta 

 superne albo-carinatus. Apertura obliqua, arcnlaris ; jieristoma 

 valde incrassatmn, multiplicatum, superne intus levlter incisum, 

 exlus in alam recedentem hand tubuluni furmanteni productuvi. 



