so. 2207. WEST AMERICAN MELANELLID MOLLVSKS—DARTSCII. 313 



MELANELLA (MELANELLA) CALIFORNICA. new species. 



Plate 37, fig. 1. 



Shell elongate-conic, straight, polished, marked by exceedingly fine 

 lines of growth and scarcely perceptible microscopic spiral striations, 

 bluish-white, except where the dry animal shines through the texture 

 of the shell, there it lends this a rosy flush. Wliorls moderately 

 rounded, separated by a slightly constricted suture. Periphery of 

 the last whorl well rounded. Base moderately long, well rounded. 

 Aperture elongate oval; posterior angle acute; outer lip drawn for- 

 ward between the posterior angle and the base; inner lip slightly 

 curved and partly appressed to the base; parietal wall covered by a 

 thin callus. 



The type (Cat. No. 56911, U.S.N.M.) comes from Catahna Island, 

 California. It has eight whorls and measures — length, 6.2 mmx; 

 diameter, 2.3 mm. 



The present species resembles quite closely M. randolpJd, but differs 

 from it in being u n if ormh' smaller and more slender, with the aperture 

 proportionately longer than that species. An additional specimen is 

 in Doctor Baker's collection from San Martin. 



MELANELLA (MELANELLA) HEMPHILLI, new species. 



Plate 37, fig, G. 



Shell straight, stout, elongate-conic, polished, marked by ex- 

 ceedingly fine lines of growth and scarcely perceptible microscopic 

 spiral striations, the two forming an exceedingly fine and very 

 regular incised grating on the surface; bluish white. Whorls moder- 

 ately rounded, very slightly constricted at the sutures. Periphery of 

 the last whorl well I'ounded. Base moderately long, but somewhat 

 inflated, well rounded. Aperture small, oval; posterior angle acute; 

 outer lip thin at the edge, which is scarcely at all drawn forward be- 

 tween the posterior angle and the base. Parietal wall covered with 

 a thick callus. 



The type and three specimens (Cat. No. 106514, U.S.N.M.) were 

 collected by Henry Hemphill, on mossy rocks between tides, at 

 Point Abreojos, Lower California. The type has 10 whorls and 

 measures — length, 8.3 mm; diameter, 3 mm. 



The present species is readily distinguished from the other straight 

 West Coast forms, thnt June rounded whorls, by its larger size and 

 by the fact that the spiral sculpture is much stronger than in ran- 

 dolplii, or califomica. 



