240 ILYANTHIDJ2. 



lateral, all of which are bluntly triangular, 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 greater 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 stripes, of dull red, more or less confluent at the lower extremity. 

 Margin pellucid, with alternating spots of opaque white. 



Disk. 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 denned at its upper edge, but ill denned 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 buff or salmon-colour. 



Conchula. 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 bf 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 veiy 

 widely gaping, displaying the thickly folded stomach, of a 

 salmon-buff hue, and the gonidial tube greatly exposed 

 and protruded. The tentacles were collapsed. When put 



