378 PEOCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



but the latter has a different aj)erture, continuous lip, and no umbilicus, 

 and its sculpture is coarser. 



Calliostoma Bairdii Verrill &, Smith. 



Amer. Joura, Sci., xx, p. 396, for Nov., 1880 (published 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. Jouru. 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 892 to 894, in 365 to 487 fathoms. 



Margarita lamellosa Verrill & Smith. 



Amer. Jouru. 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, No\a 

 Scotia, in 1877. The specimen is not now at hand for accurate descrij)- 

 tion. 



Machaeroplax bella (Verk.). 



G. O. Sars, op. cit., p. 137, pi. 9, figs. 5 a-e. 



An elegant species, allied to M. 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 3L hella four con- 

 spicuous revolving ribs on the last wborl ; 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)per ribs are visible. Base with curved transverse ridges, 

 crossed by fine revolving lines. Umbilicus moderately large and deej), 

 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 sj^eci- 

 men. I^Tew to the American coast. 



Cyclostrema trochoides (Jeff. MSS.) Friele. 



Arch. Math. Naturv., 1876, p. 308, pi. 4, figs. 2 a, &— G. O. Sars, op. cit., p. 131, 

 pi. 8, figs. 9 a-c. 



A few si)ecimens 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. There are distinct spiral 

 lines immediately around the umbibcus. It is new to the American 

 waters. 





