On Jurassic and Cretaceous fossils from North-East Greenland. 491 



Greatest diameter 104 mm; width of the umbilicus 32mm; height 

 of the last whorl 39 mm, its thickness ca. 32 mm. 



How far a greatly weathered fragment of an Ammonite, found 

 along with the above-described, can be referred to the same species, 

 is somewhat doubtful. The sculpture and suture-line seem to agree, 

 but the whorls are comparatively higher. Further, the external part 

 is flattened even on a whorl with a height of 19 mm, whilst it is 

 uncertain, if this is the case at the same stage in the first-mentioned 

 specimen. 



I have been in some doubt, as to whether the species described 

 here should be referred to Macrocephalites or to Kepplerites. In re- 

 ferring it to the latter genus my reason is, that on breaking it in 

 two I succeeded in laying open one of the innermost whorls, and it 



Kig.5. The suture-line of Kepplerites TgehonU n.sp. Height of the whorl 2!) mm. 



shows a distinct flattening on the external side. Unfortunately, 1 did 

 not succeed in getting the whole flank prepared free, so that I do 

 not know, whether nodes occur here on the points of division of the 

 ribs. This whorl is only 8 mm in diameter. How early this flattening 

 begins and how long it continues, I have not been able to see, nor 

 has it been possible to observe a "Parkinsonia-stage" preceding this 

 "Runcinate-stage"'. This flattening of the external side of the inner 

 whorls along with the striking resemblance between the suture-line 

 and the suture-line of A'. Galilaei Opp. sp., as figured in Neumayk 

 and Uhxk; (I.e., PI. 3, fig. 4 c), seems to me to show, that the species 

 must be referred to the genus Kepplerites. 



I have called this species after the famous Danish astronomer 

 Tycho Brahe. 



1 Regarding the genus Kepplerites see M. Neumayk und V. Uhi.ig: Ueber die von 

 H. Abicii im Kaukasus gesammelten Jurafossilien. p. 53. — Denkschr. der k. 

 Akad. d. Wissensch. Math.-naturw. Classe. Bd. 59. Wien 189'.;. 



