SKENEA. 163 



the gyration, the interior volutions are exposed at the um- 

 bilicus. The mouth, whieli occupies nearly the entire 

 length of the shell, and fully two-fifths of the total breadth, 

 projects or overhangs, as it were, above, and sensibly re- 

 cedes at the base ; it is almost circular, the peritreme 

 being continuous, and not tightly clasping, but merely 

 touching, the lov/er end of the preceding turn. The outer 

 lip is simple, acute, and not patulous ; it projects at a 

 right, or even an obtuse, angle from the body above, and 

 descends below the general level of the base anteriorly. 

 The pillar-lip is long, free, acute, and scarcely at all re- 

 flected. The diameter is about the twelfth of an inch. 



The operculum is circular, flat, and multispiral. 



It is greatly to be regretted that we are still unac- 

 quainted with the animal of this shell, which is rarely 

 procured alive. It inhabits the lower part of the lamina- 

 rian, and the upper part of the coralline zones, and, 

 according to Mr. Jeffreys, ranges usually from ten to 

 twenty-five fathoms in depth. It is rare ; among its 

 localities we may notice Exmouth (Clark) ; Scarborough 

 (Bean) ; Weymouth, Langland and Oxwich Bays, near 

 Swansea (Jeffreys) ; Isle of Man in twenty fathoms (E. F.) ; 

 Loch Alsh, Oban, and Zetland (Barlee) ; in seven fathoms 

 among corallines, Sanda Sound, Orkney (Thomas) ; Cork 

 (Jeffreys) ; Birterbuy Bay and Arran Isles in Galway 

 (Barlee). 



If it prove identical with the shells above cited, de- 

 scribed by Phillppi and Searles Wood, it was present in 

 the British seas during the Coralline crag epoch, and in 

 the Sicilian seas in newer Pliocene times. 



The genus Separatista of Adams has relations with this 

 curious shell, as also has the Planaria of Brown. 



