364 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 5G. 



of two moderately rounded whorls; suture distinct, not appressed, 

 the whorls between not inflated; axial sculpture of oblique quite 

 evident incremental lines, occasionally developed into minute v.Tin- 

 kles; spiral sculpture of rather irregularly spaced low threads, about 

 a dozen on the penultimate whorl, with wider mterspaces; especially 

 near the ])eriphery on the spire; on the last whorl, includmg the 

 base, they are more numerous and closer; base slightly flattened 

 with a narrow, perforate umbilicus; aperture oblique; simple, nacreous; 

 body with a coat of enamel; pillar straight, slightly callous, with 

 no projection at the base; height of shell, 20.5; of last whorl, 15; 

 maximum diameter, 20 mm. U. S. Nat. Mus. Cat. No. 223801. 



Type-locality. — Arctic Ocean, north of Bering Strait, station 10, of 

 U. S. S. Corvnn, Capt. M. Healy. 



MAUGARITES (PUPILLARIA) SI?ANNONICL'S, new species. 



Shell large, thin, gray, with a dull surface, trochiform, with a 

 minutely glassy globular nucleus and five subsequent whoils, suture 

 distinct, deep; axial sculpture of prominent, almost lamellose close- 

 set incremental lines, which near the apex of the shed develop as 

 stronger wrinkles; spiral sculpture of (on the penultimate whorl 

 four, on the last whorl between the sutm-e and the base five or more) 

 low keels, with much wider interspaces and occasional intercalary 

 threads; just over the edge of the base and around the deep rather 

 nari'ow umbilicus are other fine threads with a more or less smooth 

 space between the two groups; aperture rounded, outer lip somewhat 

 produced above, pearly, with a thin layer of enamel across the body; 

 pillar lip thin, hardly reflected; larger diameter, 14; shorter diameter, 

 11.5; height, 13 mm. Operculum whitish, of about 10 turns, fringed 

 extemally at the suture. U. S. Nat. Mus. Cat. No. 219265 



Type-locality. — Shannon Fiord, East Greenland, Doctor Pansch. 



This recalls M. striatus Broderip and Sowerby, but is a thinner and 

 more delicate shell with quite different minor characters. The 

 ovicapsules attached by the base to the specimens are discoid and 

 appear to hold only one or two eggs. 



MARGARITES (PUPILLA2IA) RUDIS, new species. 



Shell of moderate size, white, with a pale olivaceous periostracum, 

 a smooth nucleus of about one whorl and five subsequent whorls; 

 spiral sculpture of two strong cords with wider interspaces and a 

 thud on which the suture is laid and which forms the margin of the 

 base; there is also a small thread between the sutm-e and the posterior 

 cord and on the last whorl a similar thread in the interspaces; on the 

 base there are six or seven smaller closer cords separated by obscmely 

 channeled interspaces between the verge of a narrow umbilicus and 

 the basal margin; axial sculpture of (on the penultimate whorl about 

 20) retractive riblets extending from suture to periphery, with wider 



