359 



1900. Hurry-Inlet, opposite the anchoring place. Some fragments. 



1900. Hurry-Inlet, from different banks. Ca. if> valves, most nearly of an 



elongated arctiea-iorm. 

 1900. Northern part of Hurrv -Inlet, Liverpool-Coast. Ca. 20 valves of the 



arctica-iorm, but partly very elongated, 

 1900. Polhem-Dal in Forsblad-Fjord. Ca. 20 valves, mainly of the pholadis- 



form, partly rather thick-shelled. 



The fossil valves which reach a length of 49 ram. resemble 

 those of the specimens living al present at East-Greenland, as 

 both thin -shelled and exceedingly thick-shelled ones occur. 



Nathorst mentions it as fossil from several localities: 

 the mouth of Sophia-Sound; the south-side of Franz Joseph- 

 Fjord; Scott Keltie-Island and on the continent south of this 

 locality; Dusén-Fjord in the inner part of Forsblad-FiordM. 



Lyonsiidae. 



Lyonsia arenosa Moller. 



1900. Cape Dalton . . : 9—11 fms. Clay 2 specimens. 



1900. Turner-Sound ca. 3 — 3 — (empty). 



1900. Hurry-Inlet 7—0 — Sand and clay 9 — (5 empty). 



1900. Hurry-Inlet 10 — Clay 2 — 



1900. Forsblad-Fjord 14—3 — 1 — and 1 valve. 



1900. Cape Borlase Warren ,. 10 — 1 — (empty). 



The К olth off-Expedition of 1900 took 10 specimens in 

 Mackenzie-Bay, N. of Franz Joseph-Fjord, at a depth of 6V2 — 

 19 fms. and on muddy ground (Hägg 1. с. p. 62). 



The largest of the specimens, which I have at hand, 

 measures 29*5 mm., the largest from the Kolthoff- Expedition 

 measures even 34 mm. 



By the elongated shape and considerable size the East- 

 Oreenland specimens appear to belong to the form which 

 Hancock^) has named Lyonsia gibbosa (^ L. arenosa Moller 



A. G. Nathorst: Bidrag till nordöstra Grönlands geologi; Geol. Foren. 

 Forhandl. Bd. 23, 1901, p. 304. 



A. Hancock: On Shells dredged on the West Coast of Davis's Strait; 

 Ann. Mag. Nat Hist. vol. 18, 1846, p. 338, PI. 5, fig. 11 — 12. 



