498 Rev. A. living — Triassio Deposits of the Alps. 



h. Fauna of the BelleropTion Limestone : — 



Belleroplion peregrinus, Laube, and B. Gilmheli, Stach. 

 A/t'cheocidaris ladina, Stach. 



Gervillia ceratophaga, Schloth., and Gervillia (sp. ?). 

 Avicula peracnta, Stach., and A. cingulata, Stach. 

 Pecten partulus, Stach. 

 Fleurophorus Jacobi, Stach. 

 £dmondia rudis (?), M'Coy. 

 Aucella Eausmanni (?). 

 Spirigera peracuta, Stach. 

 Turbonella (sp. ?). 

 Valvulina alpina, Giimb. 



Endothyra radiifera, Giimb., and E. simplex, Giimb. 

 Trochammina vulgaris, Giimb., and T. crassa, Giimb. 

 Bulimina conlorta, Giimb. 



Lingulina lata, Giimb., and L. suhacuta, Giimb. 

 Cy there oviformis, Giimb., C. navicula, G., and C. porreeta, G. 

 Kirkbya alpina, Giimb. 



In addition to the above, several forms of doubtful or at present 

 undetermined genera are also figured, one of them being a doubtful 

 form of Anthracosia. 



The view taken by Giimbel, as to a 'transition series' between 

 tbe Dyas and Trias occurring in the Alps, reminds one of the regular 

 sequence of these strata in the German area, which was noticed in 

 my former paper. It also brings to mind the way in which Mr. 

 Twelvetrees tells us the Zechstein series in the Orenburg country is 

 overlain conformably with sandstones and marls, apparently almost 

 unfossiliferous.' The further investigation of both the Alpine and 

 the Russian series seems therefore thus far to indicate that in these 

 regions we may find the transition series which we know (on d priori 

 grounds) must exist (or have existed) somewhere. 



Triassic Strata. — What I have been able to observe during the 

 past summer, added to the observations of former years, has im- 

 pressed me more than ever with the profound truth of the remark 

 by Prof. Credner, of Leipzig, that the true key to the geological 

 history of Triassic times is to be found in the Alpine Trias.^ The 

 main results of the investigation of these strata, so far as it has 

 proceeded up to the present, are given in the table at p. 500 of this 

 paper. The chief authorities for it are von Hauer, Giimbel and 

 Credner. It presents in one view both the stratigraphical order and 

 the palasontology of the Trias of the Alps. It may be added that in 

 the classification Giimbel (as representing the latest views) has been 

 in the main followed, where he seemed to have good reasons for 

 differing from von Hauer; but these differences are not of very 

 great importance, except on the point to which reference has been 

 already made, the geological age of the Verrucano. It will be seen 

 that the three formations which constitute the German Trias have 

 their equivalents in the Alps fairly well defined. The most notice- 

 able thing about the distribution of the Triassic strata in the Alpine 

 area is perhaps their absence, or at most their very feeble represen- 



' Vide Geol. Mag. Sept. 1882. 



- Vide my former paper in recent K' umbers of this Magazine. 



