NO. 2207. WEST AMERICAN MELANELLID M0LLU8KS—BARTSCH. 351 



NISO IMBRICATA Sowerby. 



Plate 48, fig. 6. 



Eulima imbricata Sowerby, Proc. Zool. Soc, 1834, p. 7=Niso imbricata Sowerby, 

 Thes. Conch., 1854, p. 802, pi. 170, fig. 10. 



" Acuminately pyramidal, whitish, longitudinally lineated with 

 light red; whorls angulated below, prominent; umbihcus small; 

 aperture anteriorly angulated. 



"Sancta Elena; in sandy mud, from 6 to 8 fathoms. (Mus. 

 Cuming.) " 



I have not seen specimens of this species and quote the description 

 and figure from Sowerby. 



The type figured by Sowerby, in the Thesaurus, has 13 whorls 

 and measures — length, 21 mm.; diameter, 7.7m. 



NISO (7) ANTISELLI Anderson and Martin. 



Plate 48, fig. 2. 



Niso (?) anliselli Anderson and Martin, Proc. Cala. Acad. Sci., vol. 4, ser. 4, 

 1914, p. 65, pi. 7, fig. 22. 



"Shell small, smooth, with six whorls; spire conical, upper whorls 

 absent in the type-specimen; whorls nearly flat, tapering toward the 

 apex, unsculptured; suture appressed; body-whorl sharply angulated 

 at the periphery; base convex, with a distinct umbilicus; aperture 

 quadrate; outer hp distinctly angulated, angle about 100°; inner lip 

 thin, smooth; umbilical opening large but not extending to the apex 

 of the shell. 



^'Dimensions. — Altitude, apex broken, 7.5 mm.; latitude of the 

 last whorl, 4 mm. 



''Occurrence. — Tlie type-specimen was obtained from the lower 

 Miocene of eastern San Luis Obispo County, Cahfornia, locahty 125. 



" The living species of this genus are found in tropical and tem- 

 perate seas. The placing of this species in the genus Niso is some- 

 what doubtful. The umbilical opening does not extend to the apex 

 of the sheU; it is, however, much more pronounced than in any of 

 the EulimJdae or Pyramidelhdae and has therefore been classed as 

 a Niso. 



" Type. — No. 135, Cal. Acad. Sci., on top of a hill in the southwest 

 corner of the S. E. \ of sec. 29, T. 28, S., R. 15 E., San Luis Obispo 

 County, Cahfornia. 



