i ORi 



the bucklandian horizon, and their early appearance in the Angulatus /one of 

 I , show that this waa their most favorable borne. We bave identi&ed 



men with .1 but it had some tran- 



sitional eh Hying it with .1 ind also with Am. ttndootUdvm. 



Arnioceras did not appear at all in the Angulatus /one, but in the Bucklandi 

 ■one of the Rhone basin, it" Dumortier'a work can be considered as authoritative 

 upon this question. This fauna also possesses specimens of much larger size than 

 any found elsewhere, and the Beries is quite as fully, though perhaps i 

 richly, represented as in the basin of tin- Cote d'Or 



In England there are certainly fewer species and forms than in South Ger- 

 many or tin- C'ltc d'Or, and they appear to have been wholly migrants, not 

 . tin- numerous varieties observable in South Germany am] at Semur. 

 Oulj one, or at most two, sj \ s, called either obtiqm 



alter Oppel, appear to have been found in North Germany. 



_r all due allowanci - itive evidence, this appears to indicate a \ei\ 



slight representation of the genua Schliiter gives, however, a lengthy descrip- 



I i- occurring in a bed between the \ 



tnd the Bucklandi /one in the Teutoburger Wald, and his description ami 



-how that this species may he in reality divisible into several, — one simi- 

 lar tO ind perhaps another with 



marked keel ami channels. The forms are confined wholly to this stratum. 

 which ma\ ther to the Angulatus or the Bucklandi bed. The Luxem- 



aun a w a- equally \ ■ 

 This genua, therefore, certainty does not have the aspect, as far a- i- now 

 known, of having originated in or mar tin- basin of the Northeastern Alps. The 

 evidence i- oi oi its having arisen from -mall planorbis-like forma, 



either in the Co . in the South German basina At pres- 

 ent tl. i- not determinative, though somewhat in favor of the former 

 i bscquently migrated to the Mediterranean province, making 

 n the Upper Bucklandi zone. 



In company with tin- in i m species at Seraut is a doubtful form of 



' ami later in the Scipionis bed a | I found together 



with a represei I ( latum also occurs in company with 



but is the radical of another subseries of tin- gen ' cited 



M from the Osterhornes mountains a- occurring in the 



ind this i- not a difficult species to identity The Coroniceran 



forms a- cited by the same author- in the Bucklandi /one are represented only 



' I! irk, 1 however, -how- that tin- i- probably onlj a 



local | though tl ■: a- that of either South Germany, 



I Old 



Dumortii piques du Basin du I I 



\t 



