NO. 2288. NEW MOLLUSKS OF THE FAMILY TURRITIDAE—DALL. 49 



ribs and become threadlike on the canal ; aperture narrow, inner lip 

 erased, canal short. Height of shell, 8; of last whorl, 5; diameter, 

 3 mm. Cat. No. 220305, U.S.N.M. 



Bangs. — Port Etches, Alaska, in 10 fathoms, mud ; W. H. Dall. 



Named in honor of the late Professor Liitken, of Copenhagen. It 

 is a small member of the L. harpa group. 



LORA SIXTA, new species. 



Plate 16, fig. 12. 



Shell small, white with a pale olivaceous periostracum, of five or 

 more whorls (apex eroded); suture distinct; anal fasciole slightly 

 excavated, sloping to a shoulder; axial sculpture of (on the last 

 whorl about 20) narrow rounded ribs with subequal interspaces, 

 obsolete on the base, slightly nodulose on the shoulder, supplemented 

 by fine regular almost microscopic incremental lines; spiral sculpture 

 hardly visible on the ribs, of feeble threads with wider flat inter- 

 spaces, most evident toward the canal; aperture simple, inner lip 

 erased, canal straight. Height of shell, 8 ; of last whorl, 6 ; diameter, 

 3.5 mm. Cat. No. 209235, U.S.N.M. 



Range. — Off San Diego, California, in 640 fathoms, mud, bottom 

 temperature 39° F. U. S. Bureau of Fisheries steamer Albatross. 



LORA ALTHORPENSIS, new species. 



Plate 16, fig. 11. 



Shell waxen yellow, coarsely sculptured, small, of about six whorls, 

 including one smooth nuclear turn; suture distinct, anal fasciole 

 obscure, anal sulcus very feeble ; spiral sculpture on the early whorls 

 of two strong rows of nodules on the ribs, the cords connecting them 

 less conspicuous; on the last whorl there are about 14 cords, but 

 only that at the shoulder is conspicuous, the interspaces are narrower 

 with an occasional intercalary thread; axial sculpture of (on the pe- 

 nultimate whorl about 20) narrow nearly vertical ribs with subequal 

 interspaces reticulating the spirals, with deep interstices, but on the 

 last whorl becoming obsolete; aperture narrow, inner lip erased, 

 canal short, straight. Height of shell, 6.5 ; of last whorl, 4 ; diameter, 

 2.5 mm. Cat. No. 208558, U.S.N.M. 



Range. — Port Althorp, Alaska, in Granite Cove, in about 12 fath- 

 oms, sand ; W. H. Dall. 



This species belongs to the group of L. kyshanu., but is a much 

 smaller shell. 



LORA TENUISSIMA, new species. 



Plate 15, fig. 5. 

 Shell thin, fragile, acute, whitish, with about six whorls, the nuclear 

 whorl eroded; suture distinct, whorls evenly rounded; spiral sculp- 

 ture of fine even equal close-set minute threads covering the whole 

 115690— l&—Proc.N.M.vol.56 4 



