MOLLUSCA. 



Class GASTROPODA. 



Order S C UT I B RAX C H I ATA. 



Suborder RHIPIDOGLOSSA. 



Family HYDROCENID.E. 



Subfamily HYDROCENINtE. 



Shell globose, imperforate, small ; operculum calcareous, with 

 concentric striaj. 



Distribution. S.E. Europe ; S. Asia ; Malaysia ; S. Africa. 



Genus HYDEOCENA. 



Hydrocena, Parreyss, 1846, Ilermannsen's Indicis Generuni Malac. 

 i, p. 546. 



Type, H. cattaroensis, Pfeiffer; Dalmatia. 



Range. S.E. Europe ; S. Asia ; Malaysia ; S. Africa. 



Shell small, thiu, 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. 



Hcmye. India ; Malaysia. 



Original description : — Testa imperforata vel vix perforata, 

 minima, conica, succinea vel rubella, plerumque spiraliter sulcata 

 vel striata. 



Operculum semiovale, sine uUo vestigio structural spiralis, ex- 

 centrice striatum, testaceum, transparens. 



Animal parvum, lobis hemisphsericus in loco tentaculoruin 

 munitum. 



Oculi normales. Pes brevis, rotundatus. 



