JL 
KUNGL, SV. VET. AKADEMIENS HANDLINGAR. BAND 48, N:o 1. 17 
< half its breadth; colour of the shell yellowish, grayish or reddish; 
radula? go (ORIXIG)F IR ns Ek UU 10=18;1 Da 10—24 mm 
M. groenlandica (CHEMNITZ 1781). 
Pl. 4 figs. 4—27; Pl. 6 figs. 14—20. 
a. Longitudinal short folds at the suture 
var. undulata SowERBY 1838. 
fp. Spiral riblets coarse and dense var. rudis MörcH 1869. 
1 AA few spiral riblets and a few impressed lines 
var. intermedia LECcHE 1878. 
5. Smooth, depressed, umbilicus moderate var. laevigata MörcH 1869. 
e. Smooth, conical; only with 1—2 spiral ribs on the uppermost 
whorls var. levior JEFFREYS 1865. 
Shell depressed, much dilated, umbilicus wide 
var. umbilicalis BRODERIP & SOWERBY 1838. 
b. Shell with spiral and longitudinal sculpture, the former consisting 
of strong sparse riblets on the whorls and feebler ones on the base; 
the later consisting of dense-set (on the upper whorls more promi- 
nent) lamelle of growth, much finer than the spiral ridges; a spiral 
keel usually surrounding the umbilicus; colour grayish or brownish; 
radula &.1(4.1.4).1. oo; median teeth usually with acute cusps 
and about 5—7 denticles on each side. H. 10—25, D. 10—26 mm 
M. cinerea (CoUTHoUY 1839). 
Pl. 4 figs. 28—37; Pl. 5 figs. 1—5; Pl. 7 figs. 1—4. 
Shell depressed conical, whorls rounded, sculptured by low, uniform 
keels at equal distances; angular keel indistinct; umbilical keel ab- 
sent or well developed; base often nearly smooth; median teeth of 
the radula with broadly rounded cusps and fine and dense (8—14) 
denticles on each side var. striata BRODERIP & SOWERBY 1829 
(= var. grandis MörcH 1857). 
Pl. 4 figs. 34—36; Pl. 5 figs. 1—2. 
Radula with all teeth well developed (no rudimentary lateral); lamelle denti- 
culated only in the outer margin; formula 0&.0.(5.1.5).0: 0; shell com- 
pletely smooth, elevated conical; aperture nearly = the spire in height; colour 
white with a vivid iridescent lustre; central cusps of the median teeth > the 
lateral denticles. H. 2—4.3; D. 2.2—4.3 mm M. Vahlii MÖLLER 1842. 
P1; 3Tfigs, 30-40: P1 61 figs. 6—7. 
fm 
Solariella SEARLES WooDp 1842. 
Macheeroplax FRIELE 1877. 
Shell smooth or with indistinet spiral grooves, thin; whorls 5, tumid; umbilicus moderately wide and 
deep; spire pointed; shell light flesh-coloured with a faint tinge of nacreous lustre. H. 6; D. 6.5 mm. 
(Radula unknown) S. levis FRIELE 1886. 
2 
I 
K. Sv. Vet. Akad. Handl. Band 48. N:0 1. 
