W.BHNEBOCERAS \M» bchlotheimia. 



than : - Germany. Tate and Blake ' discuss the conditions of the ■ 1«-| »< >-i - 

 utd arrive at the conclusion, thai " it seems probable thai no portion <>f the 

 beds was formed in very deep water, but thai <-\.-n the shales partook <>f 

 the nature of submerged mud Bats." 



/' // urs in the Northeastern Alps, North Germany, Bohemia, and 



Hand ; and in all I ln"~«- places th<- tn. /' 

 This form is a degraded modification "I" piaaorbi which may have arisen inde- 

 itly in each locality, and it indicates thai this probablj lived under 



unfavorable conditions in these regions. Caloceras was, however, strongly rep- 

 ted in the same basina It formed an unbroken procession, bo far 

 - erne I. from the Northeastern Alp- to England. 

 -. with certain exceptions, of which we Bhall take note farther on, 

 ir to indicate thai Psiloce itochthonous in the Northeastern Alp-;. 



It probably appeared as a radical or chronologic migrant from the Trias, and 



l. . -. Thence both series may have spread by 

 chorological migration into the basins of South Germany, the Cflte d'Or, Switzer- 

 land, North Germany, and England During these migrations they mel with 



favorabl nditions in some localities, and unfavorable conditions in others; 



the inequalities of representation. In both series, however, il is obvious 

 that it was tin- discoidal species which settled in tin- new territories t<> the wesl 

 <>f the Mediterranean province. It thus becomes evident that the more highly 

 ilized and more involute species were probably not the progenitors <>t' any 

 ofthedern isequentlj arose, — an inference agreeing exactly 



with all our conclusions with regard t>» tin- radical nature of discoidal, a- com- 

 i with involute forms. 



W KHNXROCERAS \M' SCBLO I IIKIMI \. 



ually rich fauna of the Angulatus Megastoma) bed given by 



Wiihii' - the distinctive Wehner ran Bei 5 f. angulata, 



and other forms of the is well as man} of the involute Psilo- 



1 mentioned above. This assemblage shows 



undoubted 1) that a region so ricblj populated must have been exceptionally 



ible for the evolution of Waehneroceras, and | ibly also the autochtho- 



Schlotheimia. The announcement by Neumayi igen's 



gufaia in the Rustic beds near Parthenkirchen 

 in the '■' mean province, should be mentioned in this connection. 



and M - show that the Angulatus tone is verj slightly developed 



in the Osterbornes mountains, !>nt it contains Pstf. ' 



JH I identified as similar 



1 rtier in France This assemblage, therefore, coi 

 the mosl important of th< found in other regions in lh< ' - bed, 



■ 



• J. ■ \\\ III : \ II | II 



