and. Shells of Massachusetts Bay. 107 
oblique, rounded ribs, to the number of nineteen on 
the body-whorl, whose interstices are filled, with delicate 
but distinct, transverse striations, extending nearly across 
the ribs; aperture elongated, oval, rendered somewhat 
angular at the outer, superior extremity, by the planula- 
tion of the body-whorl ; lip sharp and smooth internally ; 
columella smooth, arcuated, with a slight callus upon its 
inferior portion; canal short and inclined to the left. 
OzssEnvaTioNs. ‘This shell, of which I have never 
found but one perfect specimen, has, at first sight, con- 
siderable resemblance to Fusus turrículus, Mont., espe- 
cially in the form of the aperture and disposition of the 
ribs, but is deficient in the mucronations at their sum- 
mits, so prominent in that species, whose ribs, moreover, 
are flattened or angular, instead of being rounded as in 
ours ; the color also is very different. 
It is easily recognised, by the great number and 
regularity of its ribs and striz, and the flattened appear- 
ance of the upper portion of the whorls, which give the 
body or lower whorl something the shape of a harp, on 
which account I have given it its name. 
My specimen was taken from a cod, taken off Phil- 
lips's Point, in Lynn, last September. 
Fuscus PLEUROTOMARIUS. 
Plate I. fig. 9. 
. testà acutissimé elongata, fuscà; anfractibus convexis, plicis 
kgs instructis ; apertura ovata, labro intüs levi; colum- 
arcuata, caudà b 
Long. sixteen twentieths, diam. of leat whorl eleven 
fortieths of an inch. 
Habit. deep water in Mass. Bay. 
