On Jurassic and Cretaceous fossils from North-East Greenland. 481 



Height 15 mm, length 24 mm. 



Of this species we have only a couple of valves, which agree 

 well with some casts from the Moscow Jurassic; they seem only to 

 he a little less arched. The characteristic nature of the surface 

 cannot be observed, which is probably due however to the fact, 

 that the surface of the valves is somewhat weathered. 



Distribution. North-East Greenland: "Klaft I" on Store 

 Koldewey (1 spec). In a loose-lying stone at "4. Saenkning" on the 

 same island (1 spec). 



? Spitzbergen: at Advent Bay. 



Nova Zembla: at Besimannaja. 



Russia: at Kharoschowo. 



54. Qoniomya sp. 



A single, very imperfect cast from the sandstone on the top of 

 Muschelberg, Hochstetter's Foreland, must be referred to the genus 

 Gonionu/a from its whole form and characteristic sculpture; to deter- 

 mine the species is impossible. 



55. Dentalium nodulosum LUNDGREN. 



1883. Dentalium nodulosum Lundc.ken, Jura- und Trias-Fossilien. p. 10; PI. 2, tigs. 7 — 9. 



At several localities the Dentalium tubes belong to the fossils 

 of most frequent occurrence in the sandstone. In any case a number 

 of them seem referable to I), nodulosum Ldgiin. 



Thick-walled, slightly bent tubes of up to 3 mm in diameter, 

 frequently more or less uneven in thickness. The surface with 

 coarse transverse lines and irregular constrictions and folds. 



One might be inclined to think from their whole appearance, 

 that these were Serpula tubes, but the. structure of the shell agrees 

 with that of the Dentalium tube. 



Distribution. North-East Greenland: in boulders at Vester- 

 dalen at Danmarks Havn (many spec); "Kleft I" on Store Koldewey 

 (numerous spec). — In loose-lying stones at "4. Saenkning" on Store 

 Koldewey Island (numerous spec). 



Spitzbergen: in the Jurassic 



In one of the black concretions occurring as boulders in Vester- 

 dalen at Danmarks Havn 3 specimens were found of a small Den- 

 talium. The shell is thin, smooth and shiny; but some irregular 

 cross-wrinkles can be seen under the lens. The specimens are too 

 imperfect to permit of a closer determination. 



