LAMELLIBRANCHIATA. 



49 



hagen Zoological IMuseuiii; licic there is not and never has been any specimen of ilf. iiiodiolKs from 



Greenland '). 



Iceland. 



Dr. A. C. Johansen mentions M. Diodioliis among the MoUnscs wliich occnrrcd in the greatest 

 abnndance 2—3 meters below tlie liigh-water mark at the coasts of Iceland'). Fnrther, G. Bardarson 

 has made the following observation on the northern coast: ••M.viodiolns lives here at Hunafloi at a 

 depth of 10—15 meters and is thrown np on the beach in a heavy sea, but in small quantit}", and 



regarding the conditions on the west coast he writes as follows: "At Isafjordur and Breidifjordnr 



it is found washed up at a few places in considerable quantity. At Faxafloi it is common still 



more frequent at Grindavik S. of Re>kjanes, where thousands can be collected after a heavy sea. 

 M. modiolus thus lives in shallower depths and is more frequently washed up, the fnrther south we 

 come along the west coast of Iceland".') Lastly, the Icelandic naturalist Bj. Saemundsson writes 

 to me, that M. modiolus is often thrown up on tlie beach in autunm on the north coast. 



I have made these preliminary remarks in order that the following lists may not give the 

 impression, that M. modiolus is a rarity, for example, at East and North Iceland; its littoral occurrence 

 and its considerable size have probably been the reasons why a comparatively small material of this 

 species has been brought home. 



East Iceland: 



64°58' N. L., i3°25' W. L, 40 fm. 5 spec, and r valve. 



Bakkafjordr 32 — 25 - 2 valve.s. 



The shells last-mentioned reach a length of 105 "'™. 



North Iceland: 

 Husavik. washed up with Tyaminaria rhizoids. 3 spec. 



Skagastrand Bugt 33 fm. i — 



The last specimen is small, the first up to 100 """. 



West Iceland: 



66°6' N. L., 23°59' W. L 23 fm. i spec. 



Dyrafjordr ca. 19 - 3 — 



65°52' N. L., 23°58' W. L 33 - i valve. 



Arnarfjordr, beach i spec. 



65°32' N.L., 24^38' W.L 22 - 4 — 



Grundarfjordr 9V2 - 4 valves. 



64°45-8' N. L., 23°55.2' W. L 3° - 3 spec. 



HvalfjSrdr 24 - i — and i valve. 



Krossvik 8 - , shell-gravel, blue clay, stones, i — 



1) G. O. Sars has also made the mistake in his "Tabulae distributionis' (op. cit.) of including Spitzbergen under its 

 region of distribution. 



2) Videusk. Medd. Naturh. Foren. Kbiivn., 1902, p. 387. 



3) Vidensk. Medd. Naturh. Foren. Kbhvn., 1910, p. 62. 



The IngolfEspedilion. II. s- 7 



