KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 52. N:O |6. 7 
Helicarion strangei PrrirrerR. Blackal Range ('”/» 1911), many sps, max. shell 
diam. 10, height 6 mm; Atherton (Jan. 1913), 1 sp., d. 8.5 mm (shell); Bellenden 
Ker (May 1913), 1 sp., 1. 8 mm (shell). The animal of this species has, according to 
the present material, both the shell lobes granulated, the granula being partly blackish 
gray, partly whitish like the rest of the animal; on the right-sided shell-lobe there 
is a row of larger papillae in the middle line. The whorls of the shell are 3 in 
number at a diameter of 10 mm. 
H. builaceus n. sp. (Pl. 3, figs. 79—982, text fig. 27). Shell depressed sphaer- 
oidal, with slightly prominent spire and inflated whorls; aperture rounded lunate, very 
oblique, its breadth but little greater than the height; surface polished, shining, 
sculptered with low irregular transverse costae and with feeble spiral lines in the 
shape of low elevated angles. Colour light yellowish green with darker brownish 
transverse flames. The animal is characterized by the surface of both its shell lobes, 
which bear a few lengthened warts arranged longitudinally; for the rest the lobes are 
minutely wrinkled. These verrucae of the animal, as well as the sculpture of the 
shell, distinguishes this species from H. stranget. Dimensions: length of the animal 
5 17 sy 25 5 so d5 ge 
Fig. 27. Teeth from the radula af Helicarion bullaceus n. sp. X 300. 
30 mm; I. of the shell 19, height 14, height of aperture 10, breadth 12 mm; whorls 
3'fe. Locality: Bellenden Ker, 2 sps. 
Radula (fig. 27) with about 120 teeth in one row at each side of the median 
tooth, which has a narrow central spine and a denticle on each side of its base; 
lateral teeth about 17, with an acute cusp and an exterior basal denticle, which in 
the first uncini is removed towards the apex of the spine; the sequent uncini to 
about 90 bicuspid and the outermost ones tricuspid. The last-named ones do not 
show, besides the denticles, any serration in the outer edge, such as is described for 
the subgenus Helicarion s. str. by P. and F. SARASIN (1899). 
Microcystis rustica Cox. Atherton (March 1913), 2 shs, max. d. 9 mm; Her- 
berton (Aug: 1913),-1 sp;, d. 9.5 mm, h. 6.2, br. of aperture 5 mm; wh. 5/2». Shell 
depressed trochiform, its shape like M. krefflti but smaller ; whorls convex, somewhat 
transversly rugose through irregular lines of growth, extremely finely, spirally, striated; 
suture slightly margined and minutely undulating, caused by the rugations; umbi- 
licus minute but scarcely covered by the slightly reflexed columellar margin. Distinct 
furrows running into the umbilicus, as mentioned by HEDLEY (1912); these begin 
comparatively far below the columellar sinuation (about 3 times its height from 
the body whorl). Colour grayish horny yellow; surface feebly lustrous. The species 
is distinguished from M. kreffti, to which it is strikingly similar, in its smaller size 
