RISSOIDiE, 261 



Acicula, but malleated. G sp. France. A. Simoniana, Charp. 

 (Ixxv, 35). Is perhaps terrestrial. 



LHOTELLERiA, Bourg. (LocarcUa, Folin.) Shell elongate- 

 conical, apex obtuse, whorls rather convex, with impressed 

 sutures ; aperture dilated below, columellar margin oblique. L. 

 apocrypha, Foliu (Ixxv, 36). France. 



PAULiA, Bourg., 1882. 2 sp. France. S. Berenguieri^'Bonvg. 



BELGRANDiA, Bourg. (Stalion, Brusina.) Like Hydrobia, 

 but smaller, with longitudinal swellings upon the body-whorl, 

 fainter or obsolete on those of the spire. Operculum spiral. 22 

 sp. Tertiary to recent. Southern Europe. B. gibba, Drap. 

 (Ixxii, 58). 



MiCROPYRGUS, Meek. Shell very small, subcylindrical, imper- 

 forate, obtuse at the apex; body-volution small, or less than 

 half the entire length ; aperture rhombic-oval, very narrowly 

 rounded, and more or less effuse ; peristome apparently not 

 continuous ; outer lip thin, simple, most prominent below the 

 middle. Laramie beds, Dakotah. B. minutulus, Meek (lxxiii,3). 



PALUDESTRiNA, d'Orb. (Eupaludestrina, Thalassobia, Pseu- 

 dopaludinella, Bourg.) Shell conic, more or less elongated, 

 smooth, imperforate or nearly so, apex acute; aperture ovate; 

 peritreme continuous, outer lip acute ; inner lip not thickened. 

 Operculum corneous. Scarcely distinguishable from Hydrobia, 

 except by its habitat. Distr. — Fresh water, West Indies, South 

 America. B. piscium, d'Orb. (Ixxii, 62). 



Albertisia, Issel. 



Distr. — A. punica, Issel (Ixxv, 37). Tunis. 



Shell very small, cylindrical, with sutural costae, apex obtuse ; 

 peristome continuous, reflected. Operculum unknown. May 

 be an inoperculate shell. 



MOHRENSTERNIA, Stollczka. 



Distr. — Fossil in brackish or fresh-water deposits. Eastern 

 Europe. M. angulata, Esch. (Ixxii, 59). 



Shell turriculated, thin, semipellucid ; whorls frequently 

 transversely costulate ; columella fissured at the base ; aperture 

 subovate, angulated behind, rounded in front; margin very 

 little dilated ; outer lip simple, scarcely varicose. Operculum, 

 unknown. 



This, as well as the succeeding group, may be classed here 

 temporarily , although they appear to have been aberrant members 

 of the family, at least-, if not entirely distinct. 



PoTAMACLis, Sandberger. 

 Distr. — 2 sp. Oligocene ; Europe. P. turritissima, Forbes 

 (Ixxii, 60, 61). 



