Bibliographical Notices. 



Ul 



No. of 

 Speiies. 



Arcestes, a. s 3 



Proarcestes 1 



Lobiles 1 



Joannites 1 



Cladiscitea (Hypocla- 



fliscites) 1 



Paracl.idiseites 2 



PiNACOCEliATOIDBA. 



Pinaiocei-as... 2 



Banibanagites 2 



Placites 3 



Megaphyllites 1 



Mujsv.iriies 1 



Phyiloceras 1 



No. of 

 Species. 



Ptychites 1 



Hiinjiarites I 



[Woodcut, p. 119.] 

 NAUTILEA. 



A. Gyhoceratid.e. 



Pleuronautilus 2 



B. Nautilid.e. 



Nautilus 3 



ClydonauLilus 3 



C. OliTUOCERATIU.t:. 



Ortho-eras 1 



DIBRANCHIATA. 



AULACOCERATID.E. 



Atractites 1 



lu the Results (pages 126-157) the forms described are grouped 

 in zones that correspond maioly, as characterized by the Cephalo- 

 pods, with the Carnic (page 127) and the Juvarian (page 137) 

 stages of the European Trias, as shown in the accompauyiug Table, 

 and details are given of the relationship of these stages. 



It has been the aim of geologists acquainted with the several 

 faunae found in these zones to work out the extent and limits of 

 the seas of the Trias Period. The chief of these old marine areas 

 is the so-called Thetys, including : — 1. The Mediterranean Province 

 (the most westerly inlet) ; 2. The Germanic shallow sea ; 3. The 

 Indian Province. 



" The Germanic shallow sea forms a part of the Mediterranean 

 Province, and may be regarded as an estuary, which was bordered 

 by the extensive continent now sunk in the Atlantic Ocean. This 

 Triassic 'Atlantis' existed probably already at the close of the 

 Palaeozoic period. It reached in the west probably as far as the 

 present North-American continent, which, as is known, possesses 

 extensive Triassic lacustrine deposits, of the character of the German 

 Buntsandstein and Keuper in its eastern part ; while pelagic deposits 

 of the Trias are to be met with only on the Pacific slopes of this 

 continent," 



The Upper Triassic deposits in the Arctic-Pacific Provinces are 

 not yet fully examined, but very interesting results are anticipated 

 for the future. It is known that the Noric Tirolitidte, spreading 

 from the Mediterranean Province, penetrated to the eastern shore 

 of the Pacific basin, and that " the poor Cephalopod fauna of the 

 Werfen beds extended from the eastern regions of the Thetys into 

 the small Mediterranean area." 



Further migrations appear to have occurred while the Mediter- 

 ranean gulf remained in open connexion with the Thetys. " The 

 Indian regions of the Thetys were in uninterrupted communication 

 with the Arctic regions in the Scythic as well as in the Dinaiic 

 period." 



The author has elsewhere already referr-ed to the simultaneous 

 occurrence of types in remote regions of the sea and to the surprising 

 fact that in both the Mediterranean and the Indian Trias a con- 



Ann. (i) Mag. N. Hist. Ser. 7. Vol. x. 25 



