On Jurassic and Cretaceous fossils from Nortli-East Greenland. 



491 



Greatest diameter 104 mm; width of the umbilicus 82 mm; 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. F'urther, 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 descril)ed 

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



Fig. 5. The sulure-line of Kepplerites Tiichonis n. si). Height of the whorl 2i) mm. 



shows a di-stinct flattening on the external side. Unfortunately, 1 did 

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

 not know, wdiether 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 

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

 whorls along with the striking resemblance betw'een the suture-line 

 and the suture-line of K. Galilaei Opp. sp., as figured in Neumayr 

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

 must be referred to the genus Kepplerites. 



1 have called this species after the famous Danish astronomer 

 Tycho Brahe. 



^ Regarding the genus Kepplerites see M. Nkumayk und V. Uhlig: Ueber die von 

 H. Abich im Kaukasus gesammelten Jurafossilien, p. 53. — Denkschr. der к. 

 Akad. d. Wissenscli. Math.-naturw. Classe. Bd. 59. Wien 189'J. 



