On Jurassic and Cretaceous fossils from North-East Greenland. 471 



describe them as a new species, which I have called alter First- 

 Lieut. N. P. Hoegh-Hagen, the companion and fellow-sufferer of 

 MyLius-Erichsen. The material, as mentioned, is somewhat imperfect. 

 The best preserved specimen is a left valve, of which only the 

 posterior half is preserved and the following description applies to it. 



The valve not much arched; the umbo far in front of the middle 

 of the shell; the posterior margin with a deep concavity; the ventral 

 margin (on the preserved portion of the valve) almost parallel with 

 the cardinal margin. Area fairly low. The surface covered with the 

 usual concentric folds and radial ribs. From the umbo down to the 

 front part of the ventral margin a characteristic, narrow depression, 

 bounded posteriorly by a greatly raised edge and likewise well- 

 defined in front; the middle part of the depression slightly raised 

 and characterized by a narrow, but relatively deep concavity on the 

 concentric lines. 



From the same locality there is a right valve, which should 

 rather be described as a cast with a portion of the valve preserved. 

 It has an extremely irregular form, which is perhaps however due 

 to pressure in part. The valve is strikingly high and its middle part 

 is fairly strongly arched. The posterior wing has a distinct incision 

 and the anterior margin forms almost a right angle with the cardinal 

 margin. It is somewhat uncertain whether this valve belongs to the 

 above species, but it is probable, as inter alia it also has the cha- 

 racteristic radial furrow from the beak to the ventral margin; on the 

 ventral margin a narrow, but relatively deep concavity corresponds 

 to this furrow. The height of the valve is 15 mm, its length 22 mm. 



In form the species has some resemblance to M. parallelum 

 Ii.ovAisKY, but is much higher. 



Distribution. North-East Greenland: lying loose with the 

 previous species in the middle sandstone region of Store Koldewey 

 Island (1 — 2 spec). 



J58. Astarte striato-costata MONSTER. 



PI. XXXIII, fig. 11. 



1837. Astarte striato-costata Mr.; Goldfuss, Petref. Germ., II, p. 192; PI. 134, fig. 18. 

 1883. — Golof.; Lahusen, Jurass. Bild. des Kjasanschen Gouv., 



p. 31 ; PI. 2, fig. 26. 



Very numerous specimens of one or several Astarte species were 

 found in a coarse-grained sandstone from "Kloft II" on Store Kolde- 

 wey Island. They are all badly preserved, almost without exception; 

 some of them can perhaps be referred to A. minima Phill., whilst a 

 few larger specimens are sufficiently well-preserved, that they can be 

 determined as A. striato-costata Mi. 



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