GASTROPODA. 1 1 



spiral lirse, the last with about eighteen, not counting some very fine ones within the 

 umltilicus ; 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, but 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. III. (1898), p. 205. 



Valvatella crebrilirulata. 

 (PI. II., fig. 9.) 



Shell turbinate, very narrowly perforate, white, sculptured throughout with very 

 fine numerous thread-like spiral lines, and fine oblique striae 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. 13, 1904. 



Tiie 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. 

 (PI. II., fig. 7.) 



Shell small, turl)inate, 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 V)eautiful little species, sometimes quite pearly externally as well as within. 

 It is simple in design and ornamentation, exhibiting merely fine incremental striae. It 

 recalls the V. helicina, Fabricius, of northern seas, but it has a higher spire and a smaller 

 body-whorl. 



