152 DR. O. F. VOX MOELLEXDOREF OX [Feb. 20, 



18. Htpselostoma striolatcm, sp. nov. 



Owing to the bad state of preservation of the two specimens 

 of this form, quite distinct from the preceding one, I 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 //. bensonianumnn&H. hungerfordianum. 



Fam. Asiculid.e. 



19. Truncatella valida, Pfr. 



20. Truncatella semicostata, Mouss. 



Fam. Cyclophorilve. 



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



T. lalissime umbilicata, discoidea, tenuis, transverse confertim 

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

 cornea ; spira vise prominula, apice submucronato. Anfr. Ak, 

 teretes, sutura profunda disjuncti ; idtimus paullum desccndens, 

 pone aperturam tubulum suturalem brevem ad anfracturn pen- 

 tdtimum recurvatum gerens, turn subsolutus. Apertura sat 

 obliqua, subcircidaris; peristoma duplex, internum tenue, breviter 

 porrectum, externum expansum, campanidatum, svperne ad 

 insertionem breviter auriculatum. Operculum extus fere planum , 

 lamina calcarea anfr. 8 transverse costulo-striatis, sidco sat 

 profundo ab interna tenui cornea separata. 

 Diam. maj. 14, min. 10'5, alt. 5"5 millim. 

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



anf cactus ultimus magis descendens, longing sohdus. 

 Diam. 11*5, alt. 7 millim. 



In size and general outline this species agrees somewhat with 

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

 the sutural tube is different, and the hirsuteness distinguishes it 

 from the Javan and from all other known Opisthopori. 



22. Ehiostoma iiousei, Haines. 



Three specimens of a fine large Ehiostoma agree very well with 

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

 either examples or figures. The largest specimen measures 2cS 

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

 wide, 3 high. 



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



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

 plicato-st riatida, cinerascenti-brunnea, interdum indistincte mar- 

 morata et tceniata ; spira parum elevata, apice subacuto. Anfr. 

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

 superne albo-carinatus. Apertura obliqua , circidaris ; peristoma 

 valde incrassatum, multiplicatum, su]>erne intus levifer incisum, 

 cxtus in alant rcccdentcm hand tubulum formantem productum. 



