Quaternary Fossils collected by The Danmark Expedition. 629 



an elongated arc/fca-form or pholadis-îorm ; 6 shells exhibit holes 

 made by Natica. 



Thracia septentrionalis Jeffreys. 



4 shells (one bored by Natica), of the following dimensions: 



Natica affinis Gmelin. 



13 shells. The largest of the unbroken shells measures 19 mm, one 

 of the broken specimens, however, must have been considerably 

 larger. 



Trophon clathratas L. 



2 spec, 14 — 285 mm, and a fragment of a medium sized individual. 



Biiccimim Belcheri Reeve. 



2 adult specimens and a fragment of a young one. 



Principal dimensions of the adult specimens as follows : 

 Length (minus apex, which is broken off in both mm mm 



specimens) 465 5Г5 



Greatest diameter 27 29 



Length of aperture . . . 23 255 



Breadth of do 15 16.5 



The sculpture fairly well preserved, exhibiting the spiral ribs 

 and delicate spiral lines characteristic of the species. 



The area of distribution of this species belongs to the extreme 

 Arctic: Dobbin Bay, Grinnell Land, 30 fath (Smith); Port Refuge 

 (Wellington Channel), 11 fath (Reeve); W. Greenland (Posselt); 

 E. Greenland (77°31' N. lat. 18°24' W. long), 275 metres (Grieg); 

 Jan Mayen (Friele). 



Buccimim sp. 

 A fragment. 



Sipho (Tritono fusas) Kröijeri Møller. 



2 adult specimens, fragmentary, but form and parts of sculpture 

 sufficiently well preserved to permit of our regarding the determ 

 ination as certain. 



Strongylocentrotus dröbachiensis Müller. 

 A small fragment of the shell. 



