OP THE SPECIES. Ill 



Occurs in very old strata of tlic transition limestone ; three different species are known, 

 respecting which I beg to refer to the authors quoted. 



1. A. nasutiis, Dalm. Palmad. .'34. 1 ; Emmr. Dins. 49. 1 ; Milne Edw. Cr. iii, 296. 1 ; 

 BoECK, Gaea None. 1, No. 47. 



In a gray limestone of Eastgothland, at Skarpasen and HusbyfjiJl ; occurs also in a red 

 limestone of the Billinger Mountain at Skofda. 



2. J. mammillatus, Sars' Ms, 1835, 335. 3, Table VIII, Fig. 4,a-c (the caudal shield d 

 probably belongs to a Trinudeus) ; Emmr. Diss. 49. 2 ; Milne Edw. /. c. 3 ; Boeck, /. c. 

 No. 46. 



Occurs in the transition limestone of Loadegaarts Ocn, and Hjortnaestangen, near 

 Christiania. 



3. J. rosfratus, Sars, ibid. 334. 2, Table VIII, Fig. 3, a-c; Emmr. Diss. 49. 3; Milne 

 Edw. ibid. 2; Boeck, ibid. No. 5. 



Found at the same places with the preceding species, but more rarely. 



