362 SMITHSONIAN MISCELLANEOUS COLLECTIONS \'0L. 57 



Both Saukia stosei and 6^. wardi occur in the great Cambro-Ordo- 

 vician limestones of the Appalachian region at about the horizon of 

 the upper limit of the Upper Cambrian or possibly Lower Ozarkian. 



Osceolia. — Osceolia osceola is associated with the St. Lawrence 

 fauna in Wisconsin (Localities 78 and 83', see lists of fauna, pp. 

 356, 361). In Texas (Locality 70a, p. 359) and Nevada it is identi- 

 fied from the Upper Cambrian. In Nevada it occurs (Locality 66) 

 with the following species : 



Upper Cambrian: (66) Dunderberg shale, on the first ridge north 

 of the Dunderberg mine, Eureka district. Eureka County, Nevada 

 (C. D. Walcott, 1880). 



Obolus discoideus (Hall and Whit- Agnostns tumidosus Hall and Whit- 

 field) field 



Agnostus communis Hall and Whit- Lisania angustifrons Walcott 

 field Osceolia osceola (Hall) 



Agnostus prolongus Hall and Whit- Euloma afUnis Walcott 



field Arethusina ? americana Walcott 



Calvinella. — This genus is essentially one of the transition forms 

 between Cambrian and Ozarkian. Calvinella spiniger is known only 

 with the St. Lawrence fauna (p. 356). Calvinella osarkensis in the 

 Eminence fauna, C. newtonensis in the Kittatinny limestone, and 

 C. tenuisculpta in the lower Pogonip limestone (p. 359). 



Calvinella neivtonensis occurs with the following species at locality 

 lie: 



Lower Ozarkian: (iic) Lower part of Kittatinny limestone, 

 O'Donnell and McManniman's quarry, Newton, Sussex County, 

 New Jersey (H. E. Dickhaut, 1901). 



Obolus (Westonia) stoneanus (Whit- Ptychoparia newtonensis WeWer 



field) variety or n. sp. Anomocare ? parvula Weller 



Boorthis newtonensis (Weller) Calvinella newtonensis (Weller) 



Conokephalina. — This genus occurs only in the upper beds of the 

 Franconia formation. The one species, C. misa (Hall), has been 

 found in association with species of trilobites of the genera Chario- 

 cephalus, Lonchocephalus, Ptychaspis, and Ptychoparia. and the 

 brachiopod Billingsella coloradoensis. 



