C. D. Walcott — Position of the Olenelhis Fauna. 391 



ton Linnazanum Torell, E. Torelli Linnars. These last three 

 species are probably based on inorganic markings. 



Russia. — The Olenellus zone in Estland, Russia, has, accord- 

 ing to Schmidt, the following genera and species : 



Olenellus Mickwitzi Schmidt, Scenella diseinoides Schmidt, 

 Scenella f tubercidata Schmidt, Mickwitzia monilifera Linnars- 

 son (*ip.),Obolella? sp., Diseina? sp.,Vblborthella tenuis Schmidt, 

 Platysolenites antiquissimus Eichwald (sp.), Medusites Lindstromi 

 Linnarsson, Frozna tenella Linnarsson, Cruziana, Primitia f (sp.).* 



Britain. — The Olenellus fauna was first described in Britain 

 by Professor Charles Lapworth.f At the Cumley quarries, Little 



Caradoc, Shropshire, he obtained Olenellus , Hyolithellus, 



Kutorgina, Scenella, Ptychoparia and Obolella, from calcareous 

 sandstone, in the Cumley sandstone. The stratigraphic posi- 

 tion of the sandstone in relation to the Paradoxides zone was 

 not known until the fauna proved that it belonged to the 

 Lower Cambrian. In the more complete section of the Cam- 

 brian, at St. David's, S. Wales; the purple, green and red sand- 

 stones and slates of the Caerfai group of Hicks occupy the 

 stratigraphic position of the Olenellus zone in Newfoundland, 

 as do the somewhat similar beds near Llanberis and Bangor, in 

 North Wales. As yet the few fossils found — Lingulella pri- 

 mceva, Discinaf Caerfaiensis, Leper ditia f Cambrensis, — from 

 St. David's, and Hyolites sp., and Conocoryphe viola, from 

 North Wales, do not prove the presence of the Olenellus zone, 

 although I shall include them in the Lower Cambrian fauna. 



Spain. — The only species recorded from the Spanish penin- 

 sula that can be classed with the Olenellus fauna is Ethmo- 

 phyllum Marianus Roemer. 



On the Island of Sardinia a large Cambrian fauna has been 

 discovered that includes the genera Archeeocyathus, Coscino- 

 cyathus, Obolella, Kutorgina, Olenopsis, Metacloxides, etc., etc. 

 TJntil more complete data are published on the geological sec- 

 tion and the range of the species, it is not safe to assign any 

 of the species to the Olenellus zone. 



Excluding the Sardinia fauna and admitting the genera 

 and species except where evident duplication exists, the pre- 

 Paradoxides-Olenellus-zone faunas of Europe may now be 

 credited with twenty-five genera and thirty-eight species. Of 

 these twelve genera and all the species have not been recog- 

 nized in America. Adding the European fauna to the Ameri- 

 can we have 



(9 p t /° 



Genera 67; Species 165; Varieties 9. 



* Loc. cit, p. 13. 



\ Nature, vol. xxxix, pp. 212, 213, 1888. Advanced sheets dated Oct. 25, 1888. 



