378 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 
but the latter has a different aperture, continuous lip, and no umbilicus, 
and its sculpture is coarser. 
Calliostoma Bairdii Verrill & Smith. 
Amer. Journ.. Sci., xx, p. 396, for Nov., 1880 (published Oct. 25). 
Stations 865 to 874, in 65 to 192 fathoms; many living specimens. 
Most common at stations 869 and 871, in 192 and 115 fathoms. 
Margarita regalis Verrill & Smith. 
Amer. Journ. Sci., xx, p. 397, for Nov., 1880 (published Oct. 25). 
Stations 870, 871, 880 to 895, from 115 to 500 fathoms. Most abundant 
at stations $92 to $94, in 365 to 487 fathoms. 
Margarita lamellosa Verrill & Smith. 
Amer. Journ. Sci., xx, p. 397, for Nov., 1880 (published Oct. 25). 
Stations 869 and 871, 115 to 192 fathoms. Only two specimens ob- 
tained. 
Margarita, sp. nov. 
A small, elevated, conical, nearly smooth, white, and iridescent species, 
with a small, narrow umbilicus, was dredged by us off Halifax, Nova 
Scotia, in 1877. The specimen is not now at hand for accurate descrip- 
tion. 
Macheroplax bella (Verk.). 
G. O. Sars, op. cit., p. 137, pl. 9, figs. 5 a-e. 
An elegant species, allied to J. varicosa, but with more elaborate 
sculpture. As in the latter, the whorls are crossed by oblique, flexuous, 
rounded, transverse folds, but there are, in addition, in . bella four con- 
Spicuous revolving ribs on the last hall the upper one is large and 
nodulous, giving the whorls an angular oF somewhat carinated form ; 
the two lower ribs are smaller and close together, the third one at, and 
the fourth just below the basal angle of the whorl. On the other whorls 
only the two upper ribs are visible. Base with curved transverse ridges, 
crossed by fine revolving lines. Umbilicus moderately large and deep, 
with very distinct spiral lines within it. 
Off Cape Sable, Nova Scotia (loc. 47), 90 fathoms, fine, compact sand, 
United States Fish Commission, 1877. One living and one dead speci- 
men. New to the American edaae 
Cyclostrema trochoides (Jeti. MSS.) Friele. 
Arch. Math. Naturv., 1876, p. 308, pl. 4, figs. 2 a, b—G. O. Sars, op. cit., p. 131, 
pl. 8, figs. 9 a-c. 
A few specimens of this little shell were trawled at stations 892 and 
894, in 487 and 365 fathoms. In our specimens the umbilicus is, in most 
cases, a narrow chink, but in one it is closed. There are distinct spiral 
lines immediately around the umbilicus. It is new to the American 
waters. 
