« The animal is not small relative to its shell; its color is of a gelatinous white, reminiscent of that of the mollusc of the Philine aperta. The head forms a large trilobed hood; on each side there is a lateral lobe, and in the middle part one sees the central lobe resting on the shell, covering all the anterior part of it. This lobe is sometimes extended and spread; sometimes, on the other hand, its edges come together and form a kind of siphon, which the animal, always stirring, rotates or sways from one side to another with a kind of rotary motion. The head is separated from the foot, in front, by a transverse fold in which there must probably be the aperture of the mouth. I sometimes thought I had discovered the eyes, very small and placed as in figure 4 of plate X; but at other times I could not see them. » – R. Boog Watson: op. cit. p. 313.