Assiminia 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 in the manner of construction from that 

 of Cyc. elegans as much as that of Littorina does from the operculum 

 of Trochus. 



Like the cognate genus Helleina 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, arete umbilicatd ; rubro, albo, glaucoqne 

 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 MelaniaJ 

 instead of a concentric lamellar one. Aperture entire, oblono-_oval, 

 angular at the upper part. 



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 Fiancesii, G/rn/, in Wood's Suppl. 



