LG IS8II i:i: 18. 



appeared in the Angulatus cone, the number of species on th<> bucklandian hori- 

 zon was evidently more limited than in South Germany, Semur, or England. 



The coronicei therefore, seems t" have arisen on the same level in 



the Mediterranean province, in the South German basin, and probably in the 

 I I The radicals of the subseries, bo far as known, <1<> not follow the Barae 



law. baa not yel been mentioned <>r described as occurring in any 



other basin than the Cote d'Or. ( s >i'm occurs, however, in northwest- 



ern Germany, according t«> Braun, and in the South German, Cote d'Or, and 

 H 1 1 _r 1 i - 1 1 basins in the Upper Bucklandian bed, though in the basin of the Rhone 

 Mediterranean province it is not recorded with certainty from any level 

 earlier than tin- Tuberculatus beds. 



It i< possible thai Cor. kridion may have originated in the Northeastern Alps, 

 l»nt Nenmnyr ami Wahner have not yel found this species in their researches 

 among the fossils of the Angulatus /one. ami no good figure lias been published. 

 'I'd.- early occurrence and large number of varieties and species in the collections 

 it and Semur, ami tin- numerous transitional varieties, also Bhow that 

 found it- most favorable borne either in the South German or the 

 1 d'Or basin. The earlier occurrence of the radical of the third Bubseries, 

 ' Semur, indicates tin- Cote d'Or to have been tin ntre of distri- 



bution lor the Bucklandi Bubseries. The occurrence ol I s on the 



level in South Germany, Cote d'Or, ami England shows, together with the 

 number and variety of the forms subsequently evolved, that the centre of dis- 

 tribution of the Bisulcatus Bubseries lnj in one or the other of these basins, 



This conclusion accords with the origin ami distribution of the parent Beries, 

 Arnioceros, and derives additional Bupporl from this fact. It i- evident also, 

 from (hi—- facts, thai tin' Mediterranean province musl \<<- regarded a- having 

 been peopled with migrants from the province of Central Europe, so far as relates 



to tic riUS, and thi- make- it more likelj that the radical spe- 



■ the wholi ' also arose in thi- province. So far a- known 



1 in th>- Angulatus horizon of tin- Northeastern Alps i- not sup- 

 ported by th<- |' ' transitional forms, nor by the presence ol Arnioceras in 

 .11 The species, if a real //•"/<•■./. certainly musl he provisionally 



nit from the ■, 



AG kSSIt 1 HAS 



' igatum appeared in the Angulatus /one of the Semur collection, ami 

 presented by numerous specimens in this fauna. It i- also attributed to 

 thi* horizon in the basin of the Rhone by Dumortier, ami i- well figured by him. 1 

 Germany I m/mm did nol appear until the Upper Bucklandi 



bed In England and North Germany it appeared with /</<< 



the Bucklandi horizon. This radical species, therefon 

 1 knowledj n all of these basins, derived probably from 



1 I ; 



