312 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 56. 



exclusive of the (lost) nucleus, the apical whorls feebly irregularly 

 axially plicate, the others with only rather conspicuous silky incre- 

 mental lines; at the shoulder on the last whorl are developed low 

 oblique, irregular ridges with wider interspaces; a few also appear 

 near the periphery; on the base there are about eight low obscure 

 ridges with wider interspaces; aperture ovate, pinkish brown within, 

 outer lip thin, body and pillar with a thin layer of enamel, the pillar 

 nearly straight, as is the wide short canal; the operculum large, 

 black, with apical nucleus. Height of shell, 144: of last whorl, 100; 

 diameter, 54 mm. U. S. Nat. Mus. Cat. No. 224077. 



Type-locality. — U. S. Bureau of Fisheries station 3549, in Bering 

 Sea, off Unalaska, in 78 fathoms, sand; bottom temperature, 40.1° F. 



Named in honor of Mr. W. B. Marshall of the National Museum, 

 staff and well kno\vn as a student of fresh water mollusca. 



BERINGIUS INDENTATUS, new species. 



Shell large, short^spired, acute, solid, livid whitish, with a thin 

 dehiscent pale brownish periostracum and six shouldered whorls 

 exclusive of the (lost) nucleus; axial sculpture of (on the penultimate 

 whorl, 14) rounded, arcuate ribs, withv/ider interspaces, most promi- 

 nent at the shoulder but extending over the periphery almost to the 

 canal, though somewhat irregularly disposed; other axial sculpture 

 of rather conspicuous crov/ded incremental lines; spiral sculpture 

 none, on and near the periphery of the last whorl are a few more or 

 less obsolete irregularly divergent raised lines; aperture wide, white, 

 throat pinkish, outer lip thin, expanded, body and pillar thickly 

 enameled, pillar straight, canal short, shallow, wide, hardly recurved; 

 operculum dark brown, chrysodomoid, the scar of attachment rela- 

 tively small. Height of shell, 110; of last whorl, 78; diameter, 58 

 mm. U. S. Nat. Mus. Cat. No. 213315. 



Type-locality. — U. S. Fish Commission station 3282, off the Khudu- 

 bine Islands, Bering Sea, in 53 fathoms mud; bottom temperature, 

 38.2° F. 



This belongs to the group of B. Icennicottii. 



ANCISTROLEPIS EUCOSMIUS, new Tariety BICINCTUS. 



Shell resembling typical eucosmius, but with, on the spire, only 

 two strong spiral ridges, equidistant from the sutures, and on the 

 base three more adjacent, smaller, and diminishing in size and sepa- 

 ration toward the canal. The surface is covered with a delicately 

 reticulated, velvety periostracum of a pale olive color over white 

 shelly matter. The operculum is normal. Height, 28; diameter, 

 17 mm., the apex shghtly eroded. U. S. Nat. Mus. Cat. No. 122673. 



Type-locality. — U. S. Fish Commission station 3337, southeast of 

 Unalaska, Alaska, in 280 fathoms, mud. 



