REMARKS ~7 



I te, and have collected some forms in California and other localities in t ho 

 Unite* s There are also n the collections al San Francisco, 



but these and the fossils collected at Vaoco rid, and described by Mr. 



Whiteavee of tin- Canadian Survey, which we bav< :i :it Ottawa, bIiow a 



mixture of the species of the European province besides a number of peculiar 

 forma Though not disposed to give an\ final opinion at present, tin- facts jus- 

 tify t! >ii that tli*' North American assemblage ol species has a distinct 

 own, ami ought t" I"- separated at least provisionally from tin- South 

 American ami all European faunas as tin- province of North America. 



The ooll( far made in tin- Jura show that there is a prevalence of 



the Arietidse in the Lower Lias, ami of 1 1 • « - Bpecies of Perisphinctes in the Upper 

 Jura of tin- South American province, whereas tin-.- are less abundant in North 

 America Whiteaves also shows a mixture <»i the Bpecies of the Cretaceous with 

 those of the Jura at- Vancouver's Island, which, together with the peculiar 

 - found tl. distinct basin for that locality as compared with 



the .'ma farther to the south ami cast in the United States. The fossils so far 

 found in the district of Atacamas, and at localities in the Argentine Republic, 

 show that a provisional separation should lie made between this region ami that 

 of northern Peru, ami that two basins at least, it' no! more, exist in the Jura of 



S >uth American pro> ince. 



B ; i the physical features of the distribution of the deposits ami the faunas 

 appear, therefore, to make it doubtful whether the terms Mediterranean, Cen- 

 tra] Europe, and Russia can be assumed as appropriate names for the homozoic 

 bands of the Jurassic period in America, It would he preferable to adopt for 

 these bands the nomenclature of Marcou Thus, the Bande 1 Homozoique Cen- 

 Sdarcou would become the Tropical Homozoic Band; the Bande Homo- 



toique Neutrale du Nord of Marcou would become the Temperate II izoic 



Band; and the Bande Homozoique Polaire du Nord of Marcou would become the 

 i II |: 1 ■ •■ bands could then be subdivided into provinces 



nml ! the faunas, and the real facts of the distribution of 



forms more clearly shown than by using the name- of European regions for 



ticle •• I'eher die Zone des Amm. Sowerbyi," has traced in a 



il way. following out simply the physical feature- of the distribution of the 



Jura, the following basins I St ith German Bat ting of Suabia, Fran- 



1 ia. and southi Baden "und des Randen II Helvetic 



including Switzerland, departments of Donbs, Jura, and Ain, also Rhone, 



d'Or, Haute Sadne, Haut Rhin, and Bas Rhin, and the i 



|: en HI. Mediterranean Basin, including the 

 \\e\ ron, ll« rault, Gard, ^rdeche, I>r m< B 

 nd Bouches du Rhone, and si I »i the Southern Alps. 



IV. P ! i, including the departmenl I ' Charente 



i ami perl. I I ~ B 



