191 



tened whorls, their wider umbilicus and by the inner whorls 

 being less embraced by the outer. 



Macro cephalites Ishmce. Keysfrling. sp. 



PI. VIII, figs. 7, 8 and 9. 



1846. Keyserling, A., und Krusenstern, P. Wissenschaftliche Beobachtungen 

 auf einer Reise in das Petschora-Land im Jahre 1843. St. Petersburg, 

 p. 331, tab. XX, flg. 8- 10, tab. XII, fig. 15. 



1899. PoMPECKJ, J. F. The Jurassic Fauna of Cape Flora, Franz Josef Land. 

 The NorAvegian North Polar Expedition. 1893—6. Scientific Results 

 edited by Fridtjof INansen. П. London &c. p. 72. 



Eight more or less complete specimens of this Ammonite 

 have been found at Vardeklöft. Most of the specimens occurred 

 in concretions in a very micaceous clay-shale, 550 — 580 metres 

 above sea-level. Many of the specimens have unfortunately 

 been much compressed and crushed, but the width of the 

 umbilicus, the extent to which the penultimate whorl is em- 

 braced by the outer whorl and also the sculpture of the 

 whorls are in every way identical with those of Keyserling's 

 specimens from Petchora-Land. In some of the specimens, parts 

 of the suture-lines can be made out. These resemble those of 

 Macrocephalites KœttUtzi^ Pompeckj, which, according to Pompeckj, 

 are — at any rate as far as the second lateral lobe — identical 

 with those of Macrocephalites Ishmce. Pompeckj explains that 

 Keyserling's original drawing of the suture-lines of this species 

 was not correct. 



The diameter of the largest Greenland specimen of Macro- 

 cephalites Ishmœ is about lOO"". 



According to information given by Professor Тн. Tscherny- 

 scHEw to Professor Pompeckj, Macrocephalites Ishmœ occurs in 

 the Lower Callovian or Macrocephalus-zone of the Petchora- 

 basin. 



