KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 48. N:o 1. 65 
Inlet, vN.bof NW. Famev Island; 2825 my; hard clay: (!/s 1899) 1 sp.; d. 1.7; D:o,; 
Cape: Steward, 1 km off the coast, 70” 27 N., 22? 35 W., 13—18 fms, clay, stones, algze 
("2/7 1899), 4 sps, max. h. 2.6 (striata). 
Newfoundland: 46?” 56' N., 52” 28' W., 81 fms, sand (Ing. & Glad. Exp. "/, 1871) 
many sps. These agree with the Greenland forma grandis by having many unequal 
spiral keels (9 on the last whorl). One sp. is similar to var. striata, but it has a 
wider umbilicus, an angular and an umbilical keel and alternating ribs; measurements: 
h. 19.2; ap. 9; d. 19; wh. 7. In comparing this sp. with var. striata from Skans 
Bay there is but a slight difference in the higher shell and the angular and umbili- 
cal keels of the present form. — 46” 5' N., 51”44' W., 56 fms, sand, shells (Ing. & 
Gladflxp: s/s 187) sh, bhrlls; ap. 5; di 12; iwha 6: (spiralreords 10; of which 
2 primary; base convex, coarsely ribbed; no angular keel; a rather strong umbilical 
keel; type with characters of var. striata. — 45” 59' N., 51” 49 W., 56 fms, sand (Ing. 
Fa Glad Exp.c ys IST sh hh 21;7ap. 85;sd. 18:44; wh. 72/2 (spiral keels: 10.-0f 
unequal strength; base convex, striated; no angular keel; a rather strong umbilical 
keel). 
Limits of formal variation: 
h. | 4-5 | 6—7 | 9—10 | 13—14 | max. 13.2 (Ulfsfjord) 
ap. | 2—2.7 | 2.5—3.6 | 4—4.9 6.1 | 6.1 
d. | 4.1—6 6—7.5 | 8.5—9.9 12:30 12.3 
wh. |4!/2—5 5 |5!2—6 labde Va) fe 
Spitzbergen ; h. 4—5 | 6—7 | 9—10 | 13—14 | 18—19 | 21—22 | max. 21.4 (Treurenburg Bay) 
ap. |25—3 | 32—45 | 4.2—6 |58—81 | 8.2—10.4 10.5 | 10.5 
d. | 496 | 6.6—8.3 | +9—11.8/12.5—15:9/17.5—20.5| 21.4 I 21.4 
0 | SO Sr feg fe RES RE RN RE RN 7 
North of Siberia h. | AO 6 9—10 | 13—14 | 18—19 | 24—25 | max. 25 (Vega Exp.) 
and Behring Sea; ap. | 2.3—3 1 3.7—4.2 | 5—5.7 | 7.2—7.8 | 9.4—10 11 8—12.2]| 20 
averages of d. | 4.9—6 | 1—38.2 |10.2—11.5|14.5—15.6| 19—20 | 26 | 26 
wh. | — 4!/a ARNE RSA HE TSAR MOR Gr BE [AMN 7 
h. 4—5 | 6-7 | 9=10 12—13 | max.: type 12.8 (»Iceland») striata 20 (Berufjord) 
type | type striata type striata | type = striata 
ap:| 2.1,—2:9:| 3:1—3:9, | 3.6—4.1 4—5 | 5.5—6 5.2—6.2 | d—71:5 6.2 10 
AI 0 FE Ur SA 8.5—10 110.5—11.5/10.8—12.2 13.4—14.1 11.6 21.8 
wh. |4!/2—5 | -5—5!/2 | 4'!/2—5 6—6!/2 | | (ÖV—7 53/4 - 6!/2 6/2 - 
West Greenland ; hh: | 4—5 6—7 9—10 13—14 | max. 14.2 (Kekertak) 
apps | Te 30 ögat SAG, 55.5 7.8 8 
d. | 4.2—5.8 | 5.9—8 8—11.3| 12—15.5| 16 
wh. |4!/2—5 5—5!/2 | 5!/2—6 läbout 6!/«| 6 
An examination of the sculpture shows that two extreme forms of this species 
may be distinguished from one another, the typical M. cinerea of Couthouy and M. 
striata of Broderip & Sowerby. The first is characterised by having from 4 to 6 
prominent spiral ridges, alternating with smaller ones; only one prominent keel ap- 
pears on the apical whorls; both an angular and an umbilical keel are generally pre- 
sent: the base is flattened, smooth or finely striated. A form of a considerable height 
K. Sv. Vet. Akad. Handl. Bd 48. N:o 1. 9 
