SKENEA. 155 



it is long. The body or final whorl is nearly twice as long 

 as the spire ; it is ventricose, and swells out at once from 

 under the fine but well marked suture ; its basal declination 

 is more or less abruptly rounded. The moderately project- 

 ing mouth is elongated, and occupies four-sevenths of the 

 total length ; it is of a somewhat narrow and rather obliquely 

 subovate form, gradually contracted posteriorly, and broadly 

 rounded anteriorly, where it is a little produced and dis- 

 posed to expand. The peristome is continuous, but ill- 

 defined. The outer lip is sharp-edged, and continuously 

 and broadly arcuated. The pillar-lip is long, straightish, 

 and thickened ; it is not detached from the pillar ; the 

 surface is a little concave or flattened towards the base, 

 which is rendered more apparent by its contrast to the 

 subsequent tumidity of the body- whorl. The axis is dis- 

 tinctly perforated by a narrow umbilicus. The operculum 

 is yellow ; its nucleus is lateral, and adjacent to the pil- 

 lar ; its increase is concentric. The length of the shell, 

 which exceeds its breadth, is merely the twentieth of an 

 inch. 



" The animal has not been observed in a living state, 

 but the singular operculum, similar to that of J. diaphana, 

 shows that it belongs to this genus." — Alder. 



Channel Isles (Barlee). 



SKENEA, Fleming. 



Shell orbicular, spiral, depressed, or discoid, with few 

 volutions, deeply umbilicated below. Peritreme entire, 

 continuous, circular, slightly disconnected from the body 

 whorl. Operculum corneous, of few whorls. 



Animal with a muzzle-shaped head flanked by two sub- 



