43 
Thracia truncata, Turton. 
Anatina truncata, Turton, Conch. Brit., 1822, p. 46, Pl. 4, fig. 6. 
Thracia myopsis, Gould & Binney, Rep. Invert. Mass., ed. 2, 1870, p. 71. 
Findested. Stationerne 261, 262, 273, 290, 326, 
336, 338, 357, Hammerfest, 20 fy., og Jan Mayen, 10—15 
fy. Dybde 10—197 fy. Exemplaret fra sidstnævnte lokalitet 
var 33 mm. langt og 26 mm. hgit. Et exemplar fra station 
261, som udmerkede sig ved sin langstrakte form, maalte 
henholdsvis 86 mm. og 24 mm. 
Thracia truncata, der er vet almindelig ved vor ark- 
tiske kyst, gaar mod syd til Bergen, hvor den dog neppe 
opnaar den halve størrelse af, hvad den gjør i de arktiske 
Arten er forøvrigt kjendt fra Grønland, Nordame- 
rikas østkyst indtil Massachusetts, Færøerne, Island, Jan 
Mayen, Spitsbergen, Murmankysten, Hvidehavet, Novaja 
Semlja og Karahavet. Den bathymetriske udbredelse er 
5—197 fr. Fossil er den kjendt fra Norge, nordlige Rus- 
land, Spitsbergen og Kanada. 
egne. 
truncata, G. O. Sars, Moll. Reg. Arct. Norv., 1878, p. 84, Pl. L, flas. 10—11. 
Locality. Stations 261, 262, 273, 290, 326, 336. 
338, and 357, Hammerfest (20 fathoms), and Jan Mayen 
Island (10—15 fathoms). The specimen from Jan Mayen 
was 33 mm. long, and 26 mm. high. 
Station 261, that was remarkable for its elongated form, 
measured 36 and 24 mm. in length and height respectively. 
Thracia truncata, 
arctic coast of Norway, extends southwards as far as Ber 
gen, where, however, it scarcely attains half the size that 
it does in the arctic regions. The species also occurs off 
Greenland, the east coast of North America down to Mas- 
sachusetts, the Faroe Isles, Iceland, Jan Mayen, Spits- 
bergen, the Murman Coast, in the White Sea, Novaja 
Semlja, and the Kara Sea. Its bathymetrical distribution 
is from 5 to 197 fathoms. It is a fossil in Norway, north- 
ern Russia, Spitsbergen, and Canada. 
A specimen from 
which is quite common on the 
Thracia septentrionalis, Jeffreys. 
Thracia septentrionalis, Jeffreys, Ann, & Mag. Nat. Higt., ser. 4, vol. 10, 1872, p. 238. 
Findested. Jan Mayen, 10 -15 fy., Norskøerne og 
Spitsbergen, 10—20 fr. De fleste men ikke alle af exem- 
plarerne fra Jan Mayen var forholdsvis kortere og mere tyk- 
skallede end dem fra Spitsbergen. Det er denne tykskallede 
form, Becher har beskrevet under navnet thracia crassa, 
Det største exemplar var 51 mm. lang, 24 mm. hoi. 
Foruden fra Jan Mayen og Spitsbergen er denne art 
blot kjendt fra Grønlands vestkyst, Murmankysten, Maine 
og Massachusetts, U.S. A. Den bathymetriske udbredelse 
er 10—70 fv. 
crassa, Becher, Østerreich. Polarstation Jan Mayen, Bd. 3, 1886, p. 71, Pl. 6, 
fig, 1. 
Locality. Jan Mayen (10—15 fathoms), the Norwe- 
gian Islands, and Spitsbergen (10—20 fathoms). The 
greater number of the specimens from Jan Mayen were 
comparatively shorter and had thicker shells than those 
from Spitsbergen. It is this thick-shelled form that Becker 
has described under the name Thracia crassa. The largest 
specimen measured 31 mm. in length, and 24 mm. in 
height. 
In addition to Jan Mayen and Spitsbergen, this spe- 
cies is only known off the west coast of Greenland, the 
Murman Coast, Maine and Massachusetts. Its bathyme- 
trical distribution is from 10 to 70 fathoms. 
Lyonsia arenosa, Moller. 
Pandorina arenosa, Møller, Ind. Moll. Grønl., 1842, p. 20. 
Lyoncia norvegica, Middendorf, Sibir. Reise, vol. 2, part 1, 1851, p. 264, Pl. 24, fig. S—11. 
Denne art fandtes ved Tromsø, 10—20 fv. og ved 
station 353. 1333 fy. 
Dens eneste med sikkerhed kjendte findested ved den 
norske kyst er Tromsø. Dens forekomst ved syd- og vest- 
kysten er usikker. 
arenosa, Gould & Binney, Rep. Invert. Mass., ed. 2, 1870, p. 
G. O. Sars, Moll. Reg. Arct. Nory., 1878, p. 81 og p. 
| 
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65. 
342, Pl. 33, fig. 2a—b. 
This species was found at Tromso (10—20 fathoms), 
and at Station 353 (1333 fathoms). 
The only place off the Norwegian coast where this 
species is known to be found is Tromsg. Its occurrence 
off the west and south coasts is uncertain. 
