TESTACEA. 45 



The shell has about ten distinct volutions, of which the last is 

 infinitely the largest. All are very convex and prominent, enlarging 

 regularly from the first to the origin of the last. The surface is somewhat 

 smooth, of a faint brownish shade tending to cream colour. The animal 

 is of the lightest grey or white, with a head rather small, and the sole 

 very large, with an obtuse extremity ; the shoulder broad, and the corners 

 almost hooked. A black eye is seated externally on the middle of each 

 of the two tentacula. 



This animal dwells in deep waters, from which probably, on seizing 

 the bait, it is frequently brought up by the lines of the fishermen. But 

 either from natural delicacy, maltreatment, or some other cause, it sur- 

 vives a very short time in confinement ; so that it is very difficult to 

 obtain satisfactory delineations. The specimen represented is about half 



Plate X. 



Fig. 1 . Fusus corneus, seen from above. 

 2. The same, under surface. 



RETICULATED SHELLS. 



BucciNUM MACULA. — Plate X. Figs. 3, 4. 



Length of the shell above half an inch ; volutions seven. The 

 surface is universally furrowed longitudinallj' and transversely, so as to 

 resemble articulations. Animal a Umax ; sole large, triangular processes 

 broadening the shoulder ; posterior extremity indented by a notch. Ten- 

 tacula large, with a black eye at the external base of each. As in others, 

 the interior part of the beard is prolonged in a thin skin, folding longi- 

 tudinally, so that, when the sides are closed, it resembles a proboscis. 

 This organization, always protruding in front of the animal, equals the 

 length of its body. It is often erect ; so that, when the shell sinks among 

 the substances below, the protrusion betrays its place. Colour of tiie 

 shell and animal brownish. 



