56 HELICID. 
STROPHOSTOMELLA, Fischer, 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. Reussi, Stoliczka. Cretaceous of Gosau. 
ANASTOMOPSIS, Sandberger, 1570. 
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 sharply lamellate. 
Lycunus, Matheron, 1832. 
Syn.—Anadromus, Sandberger. 
Distr.—Cretaceous; France and Spain. LZ. 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. 
PartTuLa, Fer., 1819. 
Distr.—10 sp. Central Polynesia. P. faba, Mart. (xcix, 70). 
P. Otaheitana, Brug. ‘xcix, 71). 
Shell dextral or sinistral, oblong-ovate or conic-ovate; outer 
lip reflected ; aperture 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 
strie, which are foveate at the apex. 
Viviparous. Jaw very thin, of oblique lamelle 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, Astrea, 
Clytia, Ilia, d2none, Helena, Pasithea, ea, Echo, Latia, Evadne, 
Harmonia, Matata and Sterope. Some of these names are pre- 
occupied by other authors. I give no diagnoses for the reason 
