44 NILS ODHNER, NORTHERN AND ARCTIC INVERTEBRATES. V. PROSOBRANCHIA. 1 DIOTOCARDIA. 
Gunhild Exp. "”/r 1878) 4 sps, max. h. 8.1; ap. 4; d. 9.3; whorls 6. — Göteborg 
Skärgård: Svartskär—Vinga, 26 m (Lagerberg ”!/7 1906) 1 sp.; D:o, Tistlarne, 26 m, 
and Buskär, 26—53 m (Mus. G.). — Bohuslän, numerous shs (1838) max. h. 13; 
ap. 7; d. 15.2; whorls 6-— (Figs. 5 and 7); Marstrand, N. Nordholmen — Långdals- 
udden, 20—38 m (Lagerberg '/, 1906) 1 sp.; D:o, N. Åstol—Dyrön, 18-—36 m 
(Lagerberg ””/ 1906) 2 sps; Gullmarn, off Långegap, 30 m, clay and dead 
Zostera ('"/+ 1907), 1 sp., overgrown by alge; h. 12; ap. 4.6; d. 11.2; Kristineberg, 
many localities (THÉEL 1907); Skatholmen, 5—6 m, stones, gravel, alge ("/s 1903), 
many sps, max. h. 9.7; ap. 4.2; d. 10; Delsboudd, 18—35 fms and Alsbäck, 70 fms 
(Mus. G.). — Väderöarna, numerous sps, max. h. 12.3; ap. 5.6; d. 12.5; D:o, 60 fms, 
corals, many shs, max. h. 13.7; ap. 6.4; d. 13.5; wh. 7; St. Väderö, 10—90 fms (Olsson 
"te 1869), many sps. — Lindö (Olsson 1869) I sh. — Dyngö, 15 fms; clay, I sp., 
h. 10. — Ramsö, 10—23 fms, clay mixed with sand (Eisen & Stuxberg 1871) 1 sh. 
— Sydkoster, 5—20 fms, rocks (E. & S.) many sps, max. h. 12.8; W. of Sydkoster, 
2—6 fms (Ljungman '”/+ 1865) many sps, max. h. 12; Nordkoster, inside the islands, 
2—6 fms, clay, sand (L. ””/z 1865) many shs; Kosterfjorden, 18 fms, clay (L. "/; 
1865) many sps, max. h., 15:45 ap. 0:55 d. 145 who D:os5-I5btmstrocksk(ers 
1865) many shs. — Kilsund, Skagerrack, 40 fms, shells (Gunhild Exp. '/: 1877) 1 sh., 
d. 9. — Strömstadsfjärden, 8—15 fms (Hanson ”/s 1881) 1 sp. 
Norway: Christianiafjorden (Asbjörnsen) many sps, max. h. 13; ap. 5.6; d. 12.8; 
transition form to G. tumida: h. 11; ap. 5; d. 13. — Dröbak. 5—38 fms, corals, 7 
sps, max. h. 10.s; ap. 5.1; d. 11.1; wh. 6. — Hitterö, 20—30 fms (Öberg 1869) a 
few sps, max. h. 6.3; ap. 3.6; d. 9; wh. 5!/2. — Stavanger (v. Friesen) many shs, 
max. h. 12; ap. 6; d. 13.2; wh. 6. — Flekkefjord, 15—20 fms (Öberg 1869) 3 sps. 
— Haugesund, 32 fms (Bovallius) many sps, max. h. 12.5; d. 14.5; wh. 6. — Far- 
sund, many sps, max. h. 8.7 (Mus. U.). — Gravenfjord, 150 fms, shells (Bovallius 
1880) 1 sp. hb. 35..- Bergen, many rsps, max. hb L3:6:s,ap. 0.25 d ATS TERNINONe 
Fig. 4. — Bodybet, 2 shs, max. d. 5.6. — Finmark: Ulfsfjord, 2 shs, max. h. 9; 
d. 11; wh. 6 '4. — Karlsösund, 15 fms, stones, corals (1861) 5 shs, max. h. 11.7; 
d. 13.7; wh. 7, Fig. 4. — Tromsö (Lilljeborg 1848) 7 sps, max. h. 15.2; d. 14.7 (Mus. 
U.). — Finmark (Lovén) many shs, max. h. 19.4; ap. 8.8; d. 19, Fig. 6. 
Shetland: Baltasound on stones at the shore (Hammarsten 1909) many sps, 
max. h. 15; ap. 7.5; d. 17.4; wh. 6 '/2; shells unusually solid. 
Limits of formal variation: 
I Ta FO ö I Lp "2 3 
4—5 6—7 | 8—9 | 10 vm 23 
23—3.2 3—4. 3.8—5.4 | 4.6—5.9 SUR ER UL 
measured Diameter of shell | 5.3 —7.5 4—10.2| 9.3—12  |10.6—13.6|/11.3—15.2|13.2—17.6 
1 
Whorls | = 5 526 OT HUGG NNIINGEN | stod 
E ta SARRER RE 
18—19 | max. 19.4 (Finmark) 
T.:5—8:8: | 8.8 
17.2—19 | 19 
| Scandinavia; Height of shell 14—15 
100 sps Height of aperture 
The variation is considerable as well on the Swedish as on the Norwegian 
coast; the breadth of variation is similar in both districts. Specimens from Fin- 
mark, collected by Lovén, show the maximal dimensions; such are, however, usually 
smaller than southern forms of the same number of whorls. 
