240 
ILYANTHID.E. 
lateral, all of which are bluntly triangulai’, or sub-square, two others 
still further removed from the terminal one, which are rounded and merge 
into the smooth descending edges. The mouth is sometimes widely re- 
tracted, and the groove exposed for the gi-eater part of its length ; but 
usually the conchula only is protruded from the almost closed mouth. 
Colour. 
Column. Very pale yellow, marked with irregular longitudinal splashes 
and stripef 5 , of dull red, more or less confluent at the lower extremity. 
Margin pellucid, with alternating spots of 02>aque white. 
Dish. Creamy white : each radius marked with a minute brown speck 
at the foot of each tentacle ; except that radius which is opposite (not 
correspondent) to the gonidial groove, in which the speck is wanting. 
Tentacles. White, crossed by seven waved bands of deep brown, each 
band strong and well defined at its upper edge, but ill defined and fainter 
at its lower edge : the fourth band (the central one) is broader and fainter 
than the rest. The lowest two bands are rather of a deep bluish-black. 
On the tentacle which corresponds to the groove, the lowest two bands 
are wanting, as are the lowest three on the tentacle opposite, leaving the 
face of this part of the tentacle pure white. The bands in all cases 
extend only across the front face and sides, disappearing on the back. 
Mouth. Whole interior of throat and stomach, and exterior of the lower 
parts of the groove, a rich red bufif or salmon-colour. 
Conch ula. Both without and within pure cream white. 
Size. 
Length about an inch and a quarter ; diameter of disk about seven- 
eighths of an inch ; expanded flower an inch and three-quarters ; thickness 
of column one inch. 
Locality. 
The Channel Islands. 
The only individual of this species that I have seen was 
one which I owed to the kindness of my friend Dr. Hilton, 
of Guernsey, who obtained it on the island of Herm, lying- 
on the sand at very low water, in April, 1858. When it 
arrived, after just thirty-six hours’ confinement, it looked 
much exhausted, and lay flaccid, with the mouth very 
widely gaping, displaying the thickly folded stomach, of a 
salmon-huff’ hue, and the gonidial tube greatly exposed 
and protruded. The tentacles were collapsed. When put 
