214 PROCEEDINGS OF THE PALEONTOLOGICAL SOCIETY 



CORRELATION OF THE MIDDLE CAMBRIAN OF NEWFOUNDLAND AND 



GREAT BRITAIN 



BY B. F. HOWELL 



{Abstract) 



Recent discoveries in Great Britain and southeastern Newfoundland indi- 

 cate that the faunal succession of the Paradoxides beds of those two regions 

 is remarkably similar. The three faunas occurring in Newfoundland, which 

 are characterized by Paradoxides hennetti, P. hicksi, and P. davidis, are repre- 

 sented in Great Britain by the faunas characterized by P. groomi, P. hicksi, 

 and P. davidis. A great many of the British species are represented in New- 

 foundland by nearly or quite identical forms with very similar ranges. As 

 most of the Scandinavian faunas are represented in the British sections, and 

 as most or all of the Massachusetts and New Brunswick faunas occur in New- 

 foundland (the Massachusetts Paradoxides harlani fauna, at the bottom of 

 the Newfoundland section, the New Brunswick faunas, somewhat higher up), 

 the relations between the northeastern North American and the northwestern 

 European beds are now fairly well understood. Much work still remains to 

 be done in both Great Britain and Newfoundland, and when this is completed 

 we shall probably be able to correlate the beds of the two countries in even 

 greater detail than at present. 



The recent discoveries do not appear to throw much new light on the prob- 

 lems of the place or places of origin and the migrations of the Paradoxides 

 faunas, but they do seem to prove conclusively that there was an easy route 

 of migration between the British and Newfoundland regions during a largo 

 part of known Paradoxides time. 



A third contribution dealing with the Cambrian followed, consisting 

 of a description of the Upper Cambrian stratigraphy of Wisconsin, the 

 fannal relations of the various formations, and the paleogeography of the 

 time. This paper, presented by the author and illustrated by diagrams 

 and charts, was discussed by P. E. Eaymond. 



CAMBRIAN FORMATIONS AND FAUNAS OF THE UPPER MISSISSIPPI VALLEY 



BY E. 0. ULRICH 



N"ew views on the body structure of the trilobites, resulting from the 

 author's recent researches, were then explained and illustrated by lantern 

 slides. 



TRILOBITES AS ANCESTORS 

 BY PERCY E. RAYMOND 



{Ahstract) 



When the appendages of modern Arthropoda are compared with those of 

 trilobites, it is found that the latter represent a simple type from which it is 

 r>ossible that all others were derived. Analysis shows that the phyllopodan 



