185 

 Tancredia sp. 



PI. VI, flg. 19. 



A cast which, in all probability, is derived from a species 

 of Tancredia, occurs in a light-coloured sandstone block. 

 This block was found by 0, Nordenskjold in Aucella River, 

 below the spot where the Aucella-sandstone crops out. This 

 locality is in the south-west of Jameson's Land. 



The specimen is, unfortunately, too incomplete to be deter- 

 mined with any certainty. 



Gresslya. Agassiz. 

 Gresslya gregaria. (Zieten) Goldfuss. sf. 



PL VIII, figs. 1 and 2. 



1830. Lutraria gregaria, Zieten, C. H. Die Versteinerungen Württembergs. 

 Stuttgart, p. 85, tab. 64, fig. 1 a— с 



1834—40. Lutraria gregaria, Goldfuss, A. Petrefacta Germaniæ. Düssel- 

 dorf. Theil 2, tab. 61, flg. 8— 10. 



1858. Myacites gregarius, Quenstedt, F. A. Der Jura. Tübingen, p. 447. 



Sixteen casts and the greater part of a shell, found em- 

 bedded in a fine-grained brown sandstone from Mount Nathorst, 

 are identical with casts of Gresslya gregaria, Goldf. in the 

 Munich Collection, from the «brown Jura o» of Auerbach, in 

 Oberpfalz. 



The largest specimen, a cast, is 53°^™ long, 36™™ broad 

 and 26™™ thick. 



Gresslya gregaria occurs, according to Quenstedt in the 

 "brown Jura d»] Schlossere) quotes it from the «brown Jura <5» 

 (Humphriesianum-zone) and «brown Jura £» (Parkinsoni-zone). 

 In England, Woodward ^) gives it as occurring in the Inferior 

 Oolite (Murchisonae-zone) of Dorsetshire. 



M Schlosser, M. 1901, p. 552, 559. 

 ') Woodward, H. В. 1894, p. 561. 



