Assmminia fasciata. 463 
as described by the Rev. Mr. Berkeley in the Zoological Journal, only 
in the following particulars. The foot has an oblong-ovate disk some- 
what pointed behind, instead of an oval one pointed before and behind. 
The summits of the tentacula are not inflated, and are translucent instead 
of being opaque. The edge of the mantle is even, not crenulated. 
Lastly the operculum is horny, not testaceous, and consists of many 
volutions instead of three, differing inthe manner of construction from that 
of Cyc, elegans as much as that of Littorina does from the operculum 
of Trochus. 
Like the cognate genus Helicina the animal uses its tentacula alter- 
lately to examine its path by means of the sense of touch. 
The colour of the animal is livid, with some dark olive shades. The 
tentacula are blackish-olive with the exception of the translucent 
summits, 
ASSIMINIA FASCIATA, Bens.* 
Ass. testd ovato-conicd, arcté umbilicatd ; rubro, albo, glaucoque 
utplurimum fasciatd. 
On December 25th, 1832, I discovered on the steps of a Ghaut or 
landing place, opposise to Barrackpore, hundreds of specimens of a 
living shell, which I, at the time, supposed to be a new genus, but 
which I have since ascertained to belong to Dr. Leach’s genus Assiminia. 
The specimens adhered to the steps between high and low water mark, 
within the influence of the tides, and subject to the influx of brackish 
water in the dry season, the brackishness being only overcome by the 
strength of the freshes in the rainy season. 
_ Shell ovate-conical, narrowly umbilicated, differing from Paludina 
in having a closely adhering columellar plate interposed between the 
two lips of the aperture, and in having a spiral operculum (like Melania / 
instead of a concentric lamellar one. Aperture entire, oblong-oval, 
angular at the upper part. ae 
Animal. Head with only two short, thick, subcylindrical tentacula, 
with the percipient points placed at their summits. Snout like that of 
Paludina, transversely corrugated, and bilobed, or rather emarginate 
* Turbo Francesii, Gray, in Wood’s Suppl. 
