12 THE NAUTILUS. 



moderately raised, conoidal spire, distinctly angular periphery and 

 convex base. Uniform chestnut colored. Striatulate and densely 

 though indistinctly granulate, the granules elongated in the direction 

 of growth-lines. Whorls 5^, slowly increasing, the last angular at 

 the periphery, slightly descending in front. Aperture oblique, 

 rounded-lunate, the peristome slightly expanded. Alt. 7^, diam. 

 Id. 1 , nun. Prov. Tonga (Gaines). 



Ganesella Jacobii n. sp. Shell rather narrowly umbilicate, semi- 

 globose, thin, pale yellowish corneous ; surface striatulate, decussated 

 with incised spiral lines; spire convexly conoidal ; whorls 5J,-, slowly 

 increasing, the last one very indistinctly angular at the periphery in 

 front, becoming rounded on the latter half, convex beneath, exca- 

 vated around the narrow umbilicus. Aperture oblique, lunate, the 

 peristome narrowly expanded, white, base-columellar margin reflexed. 

 Alt. l.'H, diam. 18i mm.; umbilicus slightly over 1 mm. wide. 



Oyclolus {?) micron, n. sp. Shell very minute, somewhat discoidal, 

 with low conoid spire and widely open umbilicus; composed of 3^ 

 tubular whorls, separated by deep sutures, the last one barely in con- 

 tact with the preceding at the aperture ; pale corneous, subtranslu- 

 cent, with delicate growth-stria?. Aperture circular, vertical, the 

 peristome simple ami thin, continuous. Operculum lodged at the 

 edge, presenting a densely concentrically lamellose external face, the 

 center deeply sunken. Alt. f, diam. 1.6 mm. 



Pomatiopsis ffirasei, n. sp. Shell perforate, turreted, in shape re- 

 sembling Pomatiopsis coliforniois Pils.; general color pale yellowish 

 green, produced by buff streaks and lines on a light green ground ; 

 surface nearly smooth. Whorls remaining 5 (the earlier being 

 eroded or decollate), quite convex, separated by deep sutures. The 

 last third of the last gyration of the suture does not descend as much 

 as the preceding turns, giving the effect of a slightly ascending whorl 

 toward the mouth. Aperture ovate, subangular above, the outline a 

 little flattened on the parietal margin ; peristome simple, continuous, 

 black-edged ; the columella! 1 margin arcuate, a little thickened and 

 perceptibly dilated. Alt. 0, diam. 4.8, longest axis of aperture 3.6 

 mm. Operculum ovate, brown, the cicatrix oblong, large, occupy- 

 ing the inner half of the inside face, its edge raised. 



I at first thought to place this species in the RealiidfB; but on ex- 

 amining the radula, I found it could belong neither to that family 

 nor to the Assiminiida, the dentition being far nearer that of Pom a- 

 tiopsis. The formula of denticles is — ?— , 5, 6, 6. The median den- 

 ticle in the central and admedian teeth is larger than its fellows. 

 This radula differs from that of the American Pomatiopses in having 

 two, instead of one, basal denticles on each side of the central tooth. 

 See Nautilus XII, 127; X, 37, for information on the American 

 species. 



