LAMELLIBRANCHIATA. 4 n 



hagen Zoological Museum; here there is not and never has been any specimen of M. modiolus from 



Greenland *). 



Iceland. 



Dr. A. CJohansen mentions M. modiolus among the Molluscs which occurred in the greatest 

 abundance 2 — 3 meters below the high-water mark at the coasts of Iceland'). Further, 1 i. Bardarson 

 has made the following observation on the northern coast: "M.modiolus lives here at Hiinafloi at a 

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

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



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



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

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

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

 to me, that M. modiolus is often thrown up on the beach in autumn 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 1 valve. 



Bakkafjordr 32 — 25 - 2 valves. 



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



North Iceland: 

 Husavik. washed up with Eaminaria rhizoids. 3 spec. 



Skagastrand Bugt 2>i mi - x 



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



West Iceland: 



66°6' N. L., 23°59' W.L 23 fm. 1 spec 



Dyrafjordr ca. 19 - 3 



65V N. L, 23° 5 8' W. E 33 - ' valve - 



Arnarfjordr, beach 1 spec. 



65°32' N. L., 24 3s 1 W. L 22 - 4 



Grundarfjordr 9',s - I valves. 



64°45.8' N. E, 23°55.2' W.E 30 - 3 s P ec - 



Hvalfjordr 24 - 1 and 1 valve. 



Krossvik 8 - , shell-gravel, blue clay, stones. 1 



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

 region of distribution. 



-I Vidensk. Medd. Naturh. Foren. Kbhvn., I9>>:>, p. 3S7. 



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



1 l.e [ngolf-Expedition. II. ;. 



