MOLLTJSCA. 



Class GASTROPODA. 



Order SCUTIBRANCHIATA. 



Suborder EHIPIDOGLOSSA. 



Family HYDROCENID.E. 



Subfamily HYDROCENIN^E. 



Shell globose, imperforate, small ; operculum calcareous, with 

 concentric striae. 



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



Genus HYDROCENA. 



Hydrocena, Parreyss, 1846, Hermannsen'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 nt 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. 



Range. India ; Malaysia. 



Original description : Testa imperforata vel vix perforata, 

 minima, conica, succinea vel rubella, plerumque spiraliter sulcata 

 vel striata. 



Operculum semiovale, sine ullo vestigio structurae spiralis, ex- 

 centrice striatum, testaceum, transparens. 



Animal parvum, lobis hemisphaericus in loco tentaculorum 

 munitum. 



Oculi normales. Pes brevis, rotundatus. 



B 



