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MOLLUSCA.
Class GASTROPODA.
Order SCUTIBRANCHIATA.
Suborder EHIFIDOGLOSSA.
Family HYDEOCENID^.
Subfamily HYDROCENINJS.
Shell globose, imperforate, small; operculum calcareous, with
concentric stria.
Distribution. S.E. Europe ; S. Asia ; Malaysia ; S. Africa.
Genus HYDEOCENA.
Hydnceiitt, Parreyss, 1846, Ilermannsen's Indicis Generum Malac.
'i, p. 546.
TYPE, H. cattaroensis, Pfeiffer; Dalmatia.
Range. S.E. Europe; S. Asia; Malaysia; S, Africa.
Shell small, thin, imperforate, with few volutions; whorls
convex; aperture oval, angled at the base ; labrum having the
margins joined by a light parietal callus, not reflexed, acute;
operculum subconcentric, outwardly spirally striate.
Subgenus GEORISSA.
Georissa, W. Blanford, A. M. N. H. ser. 3, xiii, 1864, p. 463.
TYPE, Hydrocena pyxis, Benson ; Burma.
liange. India; Malaysia.
Oriyinal description :—Testa imperforata vel vix perforata,
minima, conica, succinea vel rubella, plerumque spiraliter sulcata
vel striata.
Operculum semiovale, sine ullo vestigio structuras spiralis, excentrice
striatum, testaceum, transparens.
Animal parvum, lobis hemisphsericus in loco tentaculorum
munitum.
Oculi normales. Pes brevis, rotundatus.