390 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 57 



cUa nezvtoiiciisis (pi. 70, fig. 8). It differs most in the form of the 

 frontal border. The associated pygidia differ in the form of the axial 

 lobe (Compare figs. 2, 5 and 10). 



The large cranidium (fig. i, pi. 70) is from a locality 4 miles 

 (6.4 km.) west of the town of Eminence, and the pygidium (fig. 2) 

 from about a mile (1.6 km.) east of the town. They occur at about 

 the same stratigraphic horizon and with the same fauna. Other 

 fragments of cranidia and pygidia referred to this species occur in 

 association at each locality. 



The small cranidium (fig. 4) and associated pygidium (fig. 5) are 

 probably from a young specimen, although they occur about 75 to 100 

 feet (22.8 m. to 30.4 m.) higher in the strata. 



Dr. E. O. Ulrich collected the specimens in association with a 

 strongly marked fauna that he refers to his Ozarkian group of forma- 

 tions. The fauna is mentioned in the introduction of this paper, 



P- 359- 



Formation and locality. — Lower or Middle Ozarkian : Eminence 

 formation; (io2f) middle part of formation, i to 1.5 miles (1.6 to 

 2.4 km.) east of town of Eminence; also from (loob) same 

 horizon as io2f and near it at the Slater mine; also (i02h), 4 

 miles (6.4 km.) west of Eminence; all in Shannon County; and 

 locality i88y, upper part of Eminence formation near town of Flat 

 River, St. Francis County, all in Missouri. 



The locality numbers cited above are those of Dr. E. O. Ulrich 

 and are recorded in catalogues of the United States Geological 

 Survey. 



CALVINELLA SPINIGER (Hall) 



Plate 68, figs. 11-230 



Dikeloccphalus spinigcr Hall. 1803, Sixteenth Ann. Rept., State Cab. Nat. 



Hist., p. 143, pi. 10, figs. I, 2, 3?. (Detailed description with illustration 



of cranidium and pygidium.) 

 Dikelocephalus spiniger Hall, 1867, Trans. Albany Inst., Vol. 5, p. 124, pi. 5, 



figs. I, 2, 3?. (Reprint of paper of 1863.) 

 Conokepfialina spiniger (Hall), Brogger, 1886, Geol. Foren. i Stockholm 



Forhandl., Vol. 8, No. loi, pp. 205, 206. (Refers D. spiniger to proposed 



new genus Conokephalina.) 



The description by Hall (1863) is detailed, and there is little new 

 to add to it that is not shown by the figures on plate 68. All of our 

 specimens are casts in a fine-grained, rather compact sandstone. The 

 outer surface of the test appears to have been slightly roughened by 



