504 trochidjE. 



The animal, which we have examined on the Manx 

 coast, and of which Mr. Alder has kindly communicated a 

 drawing - , is of a whitish hue mottled with brown. The 

 head is deeply tinged with brown ; the head-lobes are 

 rudimentary. The tentacles are smooth and subulate, 

 white, with a brown line : the eye-peduncles are white, the 

 eyes black. The neck-lappets are pale and even-edged. 

 There are three brownish-white cirrhi on each side springing 

 from the pale side-lobes. The sides of the foot are deeply 

 tinged with brown. The foot is lanceolate, pointed 

 behind, but with obtuse angles in front. 



This species is much more generally diffused around our 

 shores than was once supposed, and though on the whole 

 a scarce shell, has been taken in all our provinces. It 

 appears to be most frequent in the Hebrides. A few 

 localities will serve to illustrate its range in depth. In 

 fifteen to twenty fathoms, West Bay of Portland, Welsh 

 coast, Oban, and Skye ; in thirty to thirty-five fathoms, 

 Loch Fyne, Mull, and Moray Firth ; in forty-five to 

 fifty fathoms, Zetland, and in ninety fathoms off Mull 

 (M'Andrew and E. F.). It occurs on both sides of 

 England, both sides of Scotland, and both sides of Ireland. 

 Lieutenant Thomas finds it in deep water, on a stony 

 ground, in from thirty to one hundred fathoms on the 

 north and north-east coast of Scotland. Mr. Jeffreys 

 notes its occurrence on leaves of Fuci (Laminarise, pro- 

 bably), in five fathoms. He has found the more conical 

 variety at Fishguard. It ranges from Norway to the 

 Mediterranean, and occurs fossil in the coralline crag. 



