20 
sulcate) zone; lines of growth rather inconspicuous. Spire about 
1 1/2 times the aperture in height, with straight outlines; base 
slightly convex. Aperture narrowly ovate, rounded above; peristome 
thin, continuous; outer lip a little produced below the middle; un¬ 
der lip narrowly sinuous with a few oblique furrows within, cor- 
responding to the spiral cords; columella perpendicular, slowly 
curved; columellar lip narrow, reflected and appressed, limiting an 
umbilical groove; parietal callus very thin. Dimensions: H. 2.7, 
br. 1 mm. — Locality: North Island; 16, 3 empty shells. 
Fossarus hyalinus n. sp. 
(PI. II, figs. 61, 62.) 
Shell minute, ovate-conic, fragile, hyaline white, umbilicate. 
Spire a little exceeding the aperture in height, with slightly convex 
outlines, base a little convex. Whorls 5, convex, sometimes a little 
flattened above the middle; suture deep, subcanaliculate. Apex 
blunt; protoconch of 2 smooth whorls, the following smooth or with 
very indistinct distant spiral striae and fine lines of growth; a more 
conspicuous, though yet very faint, impressed line in the middle of 
the last whorl. Aperture ovate, angled above and distinctly in- 
cavated by the convex parietal wall. Peristome discontinuous, thin; 
outer lip sometimes thickened at the inside, sinuous ab’ove, much 
produced below its middle, under lip much retreating to form a 
deep semicircular sinus, columellar lip simple below, reflected and 
appressed above; columella perpendicular, convex or carrying an 
indistinct tooth in its middle; umbilicus comparatively broad but 
shallow. Dimensions: H. 2, br. 1.3 mm. — Locality: North Island: 
16, several empty shells. 
The closest relative of this species seems to be Fossarus minutiis 
Petterd, described and figured by Ta te & May (1901, p. 458, 
pi. xxvii, fig. 85). The single difference seems lo be the smaller 
size of the type (h. 1.1, br. 0.7 mm), which, however, has 4 whorls 
only, its continuous peristome and its varicose outer lip. The new 
species is somewhat varying as to the convexity of the whorls, the 
more or less pronounced protraction of the outer lip and the pre- 
sence or absence of a tooth on the columella. Together with F. 
mimitus the new species will certainly, as Tate & May mean, 
prove to merit generic distinction. 
