LAMELLIBRANCHIATA. 



17 



It is naturally due to chance that all the shells brought home are small in size, none over 

 60"'"'; in reality very large specimens occur at North Iceland and in extremely large quantities at places. 



Hesteyrarfjordr 15 — 171/2 fm. 



Dyrafjordr, inside Thingnses 10 — la'/a - . 



— 18 - 



— 20 - 



Bildudalr 5 — 7 - 



Fossfjordr 44 - 



Talknafjordr 14 - 



— ca. 24 - 



N.W. of Talkni 



Patreksfjordr drag-net on beach 



65° 1 7.5' NX., 23°24'W.L 28 fm. 



Hvalfjordr 24 - 



Faxafjordr, Keflavik 15 — 16 - 



— , ca. 2 miles N.E. of Kefla- 



vik ig'/j — 20';'2 - 



— , ca. 3 miles N. 59 W. of 



Grotta Light 25 - 



Reykjavik Roads 



— — near Engey 



— , Engey l—^iz - 



Hafnarfjordr 4 — 7 - 



— , I mile E.N.E. of Helga- 



sker Vager 11' , - • 



— , I mile W.V4N. of Helga- 



sker Vager i4'/2 - 



West Iceland: 

 mud aiul small stones. 



fine, black sand. 



ooze. 



I valve. 

 I spec. 

 I — 



ooze. 



bottom-temp. 9.3° C. (August). 6 



Even at the southern boundary of its occurrence at Iceland the species attains a considerable 

 size; the specimens from Hvalfjordr reach a size of up to 80""", from Reykjavik up to 95"" and from 

 Hafnarfjordr up to 78"'™. Outside the fjords however, it has not been taken further south than in 

 Brede Bugt, and the living specimens from there are only 20 — 25"'"'. 



[The Faeroes.] 



In recent vears a number of shells of P. islandicus, all large (72 — 90 "'"j and with a "fossilized" appear- 

 ance, have been taken with the dredge at various places out to sea round about the islands, namely: 



S. of Myggenses from the line-fishing i valve 



Akralejte in X.57W. 12 miles 150 fm. 3 — , fragments. 



6i°io' N.L., 5'46' W.L 150—160 - i — 



6i°2i' N.L., 5°i2' W.L 210 - I — 



The Ingolf-Expedition. II. S- 3 



