Acmella sp.

Material examined.

Specimens from Tam Mungkorn Cave, Khamkeut District, Bolikhamxay Province (Fig. 3E).

Remarks.

These specimens are small, rather thick and hardly translucent. The species differs from Georissa decora in having a dull, relatively smooth shell surface with thin and inconspicuous growth lines only, and spiral sculpture absent, while the former species has very strong and prominent spiral ridges.