528 APPENDIX. 
of the outer lip is white, thick, sloped to an edge, marked 
with strong transverse lines within, and occasionally a few of 
the cancellations are of a white colour. 
Animal.—Mantle moderately fleshy, quite white, even with 
the margin of the aperture, except the exsertion of a not very 
long branchial siphon, which however often floats beyond the 
limits of the canal; in the example examined, its colour was 
pale drab with a tinge of yellow. The head, if it may be said 
to exist, is of the true muricidal type, scarcely interrupting 
the junction of the tentacula by the intervention of the pro- 
boscidal fissure. The tentacula are of moderate length, formed 
of strong pedicles of more than half their extent, on which, at 
the external angles, the large black eyes are fixed; the sum- 
mital portions are attenuated. The foot is slender, very 
pointed, and, when exténded, as long as the shell (this is not 
often the case), anteally deeply grooved or labiated, with short, 
but well arcuated, auricles. The ground colour of the foot 
and tentacula is subhyaline-white, aspersed with very minute, 
intense flake-white round spots, not larger than sand points. 
There is no operculum. The animal is an elegant creature, 
but singularly apathetic, though observed an hour after cap- 
ture. 
Habitat, in the offing at Exmouth, six miles from the shore, 
in 10 fathoms water, im shelly muddy sand. 
