GASTROPODA. 11 
spiral liree, the last with about eighteen, not counting some very fine ones within the 
umbilicus ; four round the middle of the whorl stronger than the rest; apex smooth, 
obtuse; lines of growth more conspicuous between than upon the ridges, aperture 
irregularly rounded; peristome thin, outer margin grooved within, the grooves 
corresponding to the external ridges ; columella a little arcuate, scarcely reflexed. 
Greater diam., 9 millim. ; height, 7 ; aperture, 4 wide. 
Operculum yellowish, a little concave externally, consisting of about nine whorls. 
Winter Quarters, June 18, 1903. In 130 fathoms. 
The distinct lines of growth cross the spiral ridges, hut are less conspicuous upon 
than between them. The aperture is more beautifully iridescent blue than the 
exterior. With regard to the use of the generic name Valvatella in preference to that 
of Margarita, see the writer’s remarks in the Proc. Malac. Soc., Vol. II. (1898), p. 205. 
VALVATELLA CREBRILIRULATA. 
(Pl. IL, fig. 9.) 
Shell turbinate, very narrowly perforate, white, sculptured throughout with very 
fine numerous thread-like spiral lines, and fine oblique strie of growth; spire elevated, 
conical, bluntish at the tip; whorls 5, the apical one smooth, glossy, suborbicular, the 
rest convex, but indistinctly angled at the middle, the angle in the body-whorl being 
above the periphery ; aperture rather large, nearly circular; peristome continuous, outer 
margin thin, columellar edge a little thickened and reflexed. 
Height, 6°5 millim.; greater diam., 6 ; aperture, 3°25 broad. 
Hut Point, Feb. 18, 1904. 
The spiral threads vary a little in slenderness. There are ten to twelve on the 
penultimate whorl, and twenty-five to thirty on the last. The umbilicus is a narrow 
perforation, partly covered by the reflexed columellar margin of the peristome. 
VALVATELLA REFULGENS. 
(Pl. IL., fig. 7.) 
Shell small, turbinate, very narrowly umbilicated, pearly iridescent, more or less 
covered with a whitish shelly film, smooth, with the exception of delicate oblique lines 
of growth; whorls 4, very convex, the last obliquely slightly descending ; aperture 
moderately large, circular, beautifully bluish pearly within; peristome thin, the 
margins joined by a thin callus, columellar edge expanded and slightly reflexed. 
Greatest diam., 5 millim. ; height, 5. 
Operculum very thin, yellowish horny, concave externally, many-whorled. 
Winter Quarters, 10-130 fathoms. 
A very beautiful little species, sometimes quite pearly externally as well as within. 
It is simple in design and ornamentation, exhibiting merely fine incremental striz. It 
recalls the V. helicina, Fabricius, of northern seas, but it has a higher spire and a smaller 
body-whorl. 
