378 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



but the latter has a ditfereut aperture, continuous lip, and no umbilicus, 

 and its sculpture is coarser. 



Calliostoma Bairdii Verrill & Smith. 



Amor. Jouru. Sci., xx, p. 396, for Nov., 1880 (publislied Oct. 25). 



Stations 805 to 874, in 65 to 192 fathoms; many living specimens. 

 Most common at stations 809 and 871, in 192 and 115 fathoms. 



Margarita regalis Verrill & Smith. 



Amer. Journ. Sci., xx, p. 397, for Nov., 1880 (xiiiblished Oct. 25). 

 Stations 870, 871, 880 to 895, from 115 to 500 fathoms. Most abundant 

 at stations 892 to 894, in 305 to 487 fathoms. 



Margarita lamellosa Verrill & Smith. 



Amer. Jouru. Sci., xx, p. 397, for Nov., 1880 (published Oct. 25). 



Stations 809 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. 



Machaeroplax bella (Verk. ). 



G. 0. Sars, op. cit., p. 137, pi. 9, figs. 5a-c. 



An elegant species, allied to M. varicosa, but with more elaborate 

 sculi)ture. As in the latter, the whorls are crossed by oblique, flexuous, 

 rounded, transverse folds, but there are, in addition, in 31. hcUa four con- 

 spicuous revolving ribs on the last whorl ; the upper one is large and 

 nodulous, giving the whorls an angular or 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 ui)i)er ribs are visible. Base with curved transverse ridges, 

 crossed by fine revolving lines. Umbilicus moderately large and deep, 

 with ^ery distinct spiral lines within it. 



Oft" Cape Sable, ISTova Scotia (loc. 47), 90 fathoms, fine, compact sand. 

 United States Fish Commission, 1877. One living and one dead speci- 

 men. ISTew to the American coast. 



Cyclostrema trochoides (Jeif. MSS.) Friele. 



Arch. Math. Naturv., 187C), p. 308, pi. 4, figs. 2 a, b—G. O. Sars, op. cit., p. 131, 

 1)1. 8, figs. 9 a-c. 



A few s])eeimeiis of this little shell were trawled at stations 892 and 

 894, in 487 and 305 fathoms. In our specimens the umbilicus is, in most 

 cases, a narrow chink, but in one it is closed. Tliere are distinct spiral 

 lines immediatel}^ around the umoilicus. It is new to the American 

 waters. 



