56 HELICID^. 



STROPHOSTOMELLA, Fisclier, 1883. Shell lenticular, with arcu- 

 ated umbilical slit ; last whorl carinated, ascending, applied to 

 the penultimate ; aperture semiorbicular, a little dilated trans- 

 versely ; peristome continuous, reflected; columella thickened. 

 B. JReussi, Stoliczka. Cretaceous of Gosau. 



Anastomopsis, Sandberger, IbTO. 



Distr. — A. rotellaris^ Matheron. Cretaceous. 



Shell plane above, periphery carinated, convex and profoundly 

 umbilicated below ; whorls narrow, numerous, the last one 

 ascending so that the falciform aperture is in the plane of the 

 spire ; interior sharpl}^ lamellate. 



Lychnus, Matheron, 1832. 



Syn. — Anadromus, Sandberger. 



Distr. — Cretaceous ; France and Spain. L. Matheroni, Re- 

 quien. 



Shell discoidal, convex at base, with, arcuated umbilical slit; 

 whorls of the spire few, narrow, forming a small column, last 

 whorl very large, ascending and partially covering the spire to 

 the apex, then deflected downwards ; aperture on the side of the 

 base, horizontal, oval, transverse, without teeth ; peristome 

 reflected. 



Hypselostoma , Benson, 1856. 



Syn. — Tanystoma, Benson, 1856. 



Distr. — 3 sp. Burmah. H. tubiferum, Bens, (c, 99). Ava. 



Shell convolute, conoidal, umbilicus open, last whorl free, pro- 

 tracted, turned upwards; aperture trumpet-like and dentate; 

 peristome horizontal, expanded. 



Partula, Fer., 1819. 



Distr. — TO sp. Central Polynesia. P. faba, Mart, (xcix, 70). 

 P. Oiaheitana, Brug. 'xcix, 11). 



Shell dextral or sinistral, oblong-ovate or conic-ovate ; outer 

 lip reflected ; apei'ture auriform or ovate, more or less oblique, 

 occasionally contracted by the wide and often dentate columella, 

 and by a labial or pillar-tooth ; surface with very minute spiral 

 striffi, which are foveate at the apex. 



Yiviparous. Jaw very thin, of oblique lamellte sharply angu- 

 lated at the centre; lateral teeth tricuspidate, the inner cusp 

 short, marginals narrow, arcuate, tricuspidate. 



Dr. W. D. Hartman, who has made a special study of this 

 genus, proposed in 1881 a number of subgenera : Nenia, Astrsea, 

 Clytia, Ilia, CEuone, Helena, Pasithea, ^ga, Echo, Latia, Evadne, 

 Harmonia, Matata and Sterope. Some of these names are pre- 

 occupied by other authors. I give no diagnoses for the reason 



