1916. No. 10. THE LOWER CAMBRIAN HOLMIA FAUNA. 23 



This form, which is one of the Lower Cambrian n7)e fossils that has 

 been longest known in Scandinavia, has been found in Norway in the 

 basal conglomérat at Engerdalen ^, Hadeland-, Hennungbygden^. Nordsinnen* 

 and Finse^ and in Holmia shales at Brennsaeter* and Br.\stad river'. 

 In Sweden ^ it has been found in a great number of localities in the Lower 

 Cambrian sandstone and conglomerates , and further on Aaland. in the 

 Aabo skerries in Finland, and on Bornholm. 



Remarks: This is undoubtedly the same form as that which G. Holm 

 mentioned from the Holmia shales at Tomten under the name Torellella 

 laevigata Lnrs. In the same material Holm found one straight specimen 

 that in its dimensions completely agrees with specimens in my own collections. 



It is quite common at Tomten, and in my material there is a con- 

 siderable number of specimens, although the majorit}- of them are mere 

 fragments. As they all are compressed in the shale it is not possible to 

 determine the original form of the shell with certainl}'. 



The best idea of the latter is conveyed by the specimen that I have 

 depicted in text-fig. 4 c. If we combine this specimen with a number of 

 others we obtain the following results: — 



The broader part of the shell is straight, and slightly diminishes in 

 breadth posteriorly, then bending into a direct or fainth* cur\ed initial 

 part that narrows markedly. The angle of divergence does not appear 

 to be quite constant either at the broader or at the narrower part of the 

 shell; the narrowing therefore varies somewhat in the different specimens. 



Unfortunate]}- it is not possible to decide whether the shell has been 

 bent in other directions, as Holm described in the case of typical specimens 

 of Torellella laez'igata, which had been plastically preserved in sandstone and 

 conglomerates. Presumably this has been the case to a limited extent only. 



Another important point that is difficult to decide is the section. 

 Compression in the shales may be greater or less, as shown by figs, f g 

 in the text fig. 4. FortunateU- I discovered a fragment of this form in a 

 piece of sandy limestone (text-fig. 4 h — if. This plastically preser\ed fi*ag- 



' O. E ScHiöTZ, Om øiegneisen i sparagmitfjeldet (N. Mag. (. N. 189a». G. Houi, Hyoli- 



thidae etc. iS. G. U. Ser. C. V. 112. 1893, pag. 148K 

 - W. C. Brøgger, Norges Geologi in .Norge i 19de aarh." pag. 201. 

 3 O. HoLTED.\HL, Hennungbygdens Alunskiferfelt tN. G. Tidsskrift. Bd. II. 191 1. pag. 106/. 

 ^ O. HoLTED.\HL, lagtt. over fjeldbygningen Randsfjordens Nordende (N.G.U. aarb.i9r5 nr. i ►. 

 ^ V. M. GoLDSCHîtrDT. Ein kambr. Konglom. von Finse (Vid. Selsk Skr. 1912 nr. 18). 

 ^ K- O. BjoRLYKKE, Centrale Norges Bjergbygning (N. G. U. nr. 39, 1905, pag. 33}. 

 " J. Brâst.\d, Disdnella Holsii-fauaaea iN. G. Tidsskr. Bd. III, nr. 5. 1915». Torellella 



from green shales by Th. MCxster (Beskrivelse fra kartbladet Lillehammer. N. G. U. 



nr. 30, 1 90 1 1 is probably Volborthella. 

 ■* G. Houi, HyoUihidae etc (S, G. U. Ser. C, 112, 1893. pag. 148». A G.welik. Om 



underkambr. sandstensganger \nd Vânern. 1909. 



