m. 2288. NEW MOLLUSKS OF THE FAMILY TURRITIDAE—DALL. 65 



last whorl 15) narrow rather sharp ribs with much wider interspaces, 

 obsolete behind the shoulder and on the base; there are also fine 

 incremental lines which roughen the spiral threads; anal fascicle in- 

 conspicuous, anal sulcus feeble ; aperture simple, outer lip p harp ; axis 

 pervious, pillar attenuated in front, canal short. Height of shell, 5 ; 

 of last whorl, 3.5 ; diameter, 2 mm. Cat. No. 206554, U.S.N.M. 



Range. — Off Point Ano Nuevo, California, in 56 fathoms, mud, bot- 

 tom temperature 49.2° F. U. S. Bureau of Fisheries steamer Alba- 

 tross. 



This shell is quite characteristic, though doubtless immature. 



MANGILIA PERATTENUATA Dall. 



Plate 20, fig. 11. 

 Mangilia perattenuata Dall, Nautilus, vol. 18, No. 11, p. 123, Mar. 8, 1905. 

 Range. — Monterey Bay, 10 to 45 fathoms. 

 This is larger and more slender than the allied constricta Gabb. 



MANGILIA PAINEI Arnold. 



Plate 23, fig. 3. 

 Mangilia painei Arnold, Pal. San Pedro, p. 214, pi. 8, fig. 1, 1903. 



Shell small, slender, whitish, with one subglobular nuclear and six 

 subsequent whorls, suture distinct, undulated by the sculpture ; spiral 

 sculpture on the apical whorls of two cords near the periphery, over- 

 running the ribs and becoming fainter with each succeeding whorl 

 and quite obsolete on the last two whorls; axial sculpture of (on the 

 last whorl 10 or 11) rounded protractive ribs with subequal inter- 

 spaces, extending from the fasciole to the succeeding suture and on 

 the earlier whorls from suture to suture ; the incremental lines are also 

 distinct but not coarse ; anal fasciole feeble, the sulcus obscure ; aper- 

 ture simple, the pillar attenuated in front, canal short. Height of 

 shell, 15; of last whorl, 9; diameter, 4.5 mm. Cat. No. 161420, 

 U.S.N.M. 



Range. — San Pedro, California, Mrs. Eshnaur. Also Pleistocene. 



First described as a fossil. The strength of the sculpture varies in 

 different specimens. 



MANGILIA NUNIVAKENSIS, new species. 



Plate 1, fig. 2. 



Shell thin, rather large, whitish, acute, elevated, of about seven 

 whorls, the nucleus eroded, suture distinct, the anal fasciole hardly 

 constricted, concavely wrinkled; axial sculpture of (on the penul- 

 timate whorl about 18) protractive rather feeble, rounded ribs, with 

 subequal interspaces, becoming obsolete on the base ; spiral sculpture 

 practically none; aperture simple, anal sulcus wide and shallow, 

 outer lip arcuate, canal straight. Height of shell, 18 ; of last whorl, 

 12 ; diameter, 6 mm. Cat. No. 220348, U.S.N.M. 

 115690— 19— Proc.N.M 7ol.56 5 



