386 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 5/ 



OSCEOLIA OSCEOLA (Hall) 



Plate 68, figs. 4-10 



Dikeloccphalus osceola Hall, 1863, Sixteenth Ann. Rept., New York State 

 Cab. Nat. Hist, p. 146, pi. 10, fig. 18; pi. 7, fig. 49. (Describes and 

 illustrates cranidium and supposed free cheek and pygidium of this 

 species.) 



Dikeloccphalus osceola Hall, 1867, Trans. Albany Inst., Vol. 5, p. 128, pi. 5, 

 fig. 18; pi. 7, fig. 49 ?. (Reprint of paper of 1863.) 



Dicellocephalus osceola Hall, Walcott, 1884, Monogr. U. S. Geol. Survey. 

 No. 8, p. 40, pi. 9, fig. 25. (Identifies cranidium from Nevada and gives 

 illustration. By error the field label was copied in description and the 

 species referred to the Prospect Mountain limestone.) 



Conokephalina osceola (Hall), Brogger, 1886, Geol. Foren. i Stockholm 

 Forhandl., Vol. 8, No. loi, p. 205. (Refers species to genus Conokepha- 

 lina.) 



The description given under the genus includes what is known of 

 the species. It occurs in the friable St. Croix sandstone as casts, 

 while in the limestones of Nevada and Texas the test is more or less 

 well preserved. The outer surface of the test is nearly smooth, 

 although there are slight indications that it may be minutely punctate. 



The largest specimen of the cranidium has a length of 20 mm. 



The original illustrations by Hall included a free cheek (1863, 

 pi. 10, fig. 19) that is not the same as the cheek attached to the 

 cranidium (this paper, pi. 68, fig. 7). The pygidium tentatively 

 referred to the species by Hall (1863, pi. 7, fig. 49) probably belongs 

 with it as a similar pygidium occurs with the cranidium in numbers 

 when the only other cranidia are those of Illceriurus quadratus Hall. 



Formation and locality. — Upper Cambrian : St. Lawrence forma- 

 tion ; (78) quarry near St. Croix River, in suburbs of Osceola, Polk 

 County (L. C. Wooster, 1883) ; (83') upper horizon near Trem- 

 pealeau, Trempealeau County (Chas. Schuchert, 1893) ; and doubt- 

 fully (8ib) Jordan formation, near Devils Lake, Sauk County 

 (Cooper Curtice, 1884), all in Wisconsin. 



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

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

 (C. D. Walcott, 1880). 



Upper Cambrian: (70a) Wilberns formation, Baldy Mountain, 

 near Morgans Creek, 8 miles ( 12.8 km.) northwest of Burnet, Burnet 

 County, Texas (C. D. Walcott, 1884). 



