Leptochiton cancellatus, Sowerby. 
Chiton 
cancellatus, Sowerby, Conch. Ill., 1839, fig. 104, 105. 
— — Jeffreys, Brit. Conch., vol. 3, 1865, p. 217, vol. 5, p. 198, Pl. 56, fig. 1. 
Lepidoplewus —- 
Leptochiton = 
Lepidopleurus — 
Findested. Bodø, Tromsø, 30 fy., stationerne 26, 
147 og 270. Dybde 30—237 fy. 
Leptochiton cancellatus forekommer ved De britiske 
øer, Spanien, Middelhavet, Adriaterhavet, Alaska og Norge, 
hvor den har sin norderænse ved Vestfinmarken. Dall 
anfører den ogsaa fra Grønland; den findes imidlertid ikke 
optagen i Posselts fortegnelse over Grønlands mollusker. 
Muligens er det dog denne art, Posselt omtaler under 
navnet chiton arcticus. Den bathymetriske udbredelse er 
6— 237 fv. 
G.. OF Sars, Moll, Reg. Arct. Nory., 1878, p. 111, Pl. 7, fis. 6a—h, Pl. I, fig, 8. 
Dall, Proc. U. S. Nat. Museum, vol. 1, 1878, p. 315. 
Tryon, Man. of Conch., vol. 14, 1892, p. 3, Pl. 3, fig. 54—58. 
Locality. Bodø, Tromsø (30 fathoms), Stations 26, 
147, and 270. Depth 50—287 fathoms. 
Leptochiton cancellatus occurs off the British Isles, 
Spain, in the Mediterranean, the Adriatic, off Alaska, and 
Norway, in the last-named country having its northern limit 
in West Finmark. Dall also mentions it from Greenland, 
but it is not included in Posselt’s list of the Mollusca of 
Greenland. It is possible, however, that it is this species 
that Posselt mentions under the name of Chiton arcticus. 
Its bathymetrical distribution is from 6 to 237 fathoms. 
Leptochiton arcticus, G. O. Sars. 
Lepidopleurus arcticus, G. O. Sars, Moll. Reg. Arct. Norv., 1878, p. 112, Pl. 7, fig. Ta—h. 
Denne art foreligger kun fra Alten, 30 fy. I Frieles 
foreløbige beretning om Spitsbergens molluskfauna findes 
den opført fra Advent Bay, 20 fv., men har det ved senere 
undersøgelse vist sig, at exemplarerne fra denne localitet 
ikke tilhører leptochiton arcticus men trachydermon albus. 
Leptochiton arcticus maa derfor igjen udgaa af Spitsbergens 
fauna. 
Leptochiton arcticus er kjendt fra Tromsø, Finmarken, 
Murmankysten og Grønland. 
Jeffreys funden af Lightning expeditionen i Færøkanalen. 
Den bathymetriske udbredelse er 20—229 fy. 
Endvidere er den ifølge 
Det er under stor tvivl, vi optager denne art. Exem- 
plarerne fra Alten har alle Sars's karakterer, men dog har 
vi vanskelighed for at adskille dem fra Leptochiton can- 
cellatus. Af denne grund skulde vi i overensstemmelse med 
Dall (op cit., pag. 316) være mest tilbgielig til at betragte 
den som en varietet af denne art. Ogsaa Sparre Schneider 
synes at have vanskelighed for at holde disse to former ud 
fra hinanden. 
Schneider, Tromsø Museums årshefter, vol. 8, 1886, p. 97. 
Tryon, Man. of Conch., vol. 14, 1892, p. 5, Pl. 3, fig. 59—63. 
This species was only found at Alten (80 fathoms). 
In Friele’s preliminary report on the molluse fauna of 
Spitsbergen, it is mentioned from Advent Bay (20 fathoms); 
but subsequent examination has proved that the specimens 
from this locality do not belong to Leptochiton arcticus, 
but to Trachydermon albus. Leptochiton arcticus must 
therefore once more be omitted from the fauna of Spits- 
bergen. 
Leptochiton arcticus is reported from Tromsø, Finmark, 
the Murman Coast, and Greenland. According to Jeffreys, 
it was also found by the ‘Lightning’ Expedition in the 
Faroe Channel. Its bathymetrical distribution is from 20 
to 229 fathoms. 
It is with great doubt that we admit this species. 
All the specimens from Alten have Sars’s characters, but 
yet we have a difficulty in distinguishing them from Lep- 
tochiton cancellatus. Kor this reason we are most inclined, 
with Dall (1. ¢., p. 316), to regard it as a variety of that 
species. Sparre Schneider also appears to have difficulty 
in keeping these two forms separate. i 
