NO. 13 DIKELOCEPHALUS AXD OTHER GENERA 389 



and pygidium. This is finely shown by figures i, 8, and 9, plate 70, 

 and less distinctly by the casts of C. spiniger (pi. 68, figs. 11, 13, and 

 20). 



A small cranidium occurs in a coarse sandstone near Devils Lake, 

 Sauk County, Wisconsin (8ib), that suggests by its large palpebral 

 lobe, rounded frontal rim and strong posterior glabellar furrow, a 

 form of CalvincUa that differs from C. spiniger by having the glabella 

 narrow gradually towards its rounded front. The specimen is a cast 

 and it is too imperfect for specific identification. 



Genotype. — Dikelocephalus spiniger Hall (1863) (this paper, p. 



390)- 



Stratigraphic range. — Upper beds of Upper Cambrian and lower 



beds of the Ozarkian of Ulrich. 



Geographic distribution. — Upper Mississippi valley in Missouri 

 (C. osarkensis) and Wisconsin (C. spiniger) ; Atlantic Basin region 

 of New Jersey (C. newtonensis) ; Cordilleran region (C tenuis- 

 ciilpta). 



CALVINELLA NEWTONENSIS (Weller) 

 Plate 70, figs. 7-I1, iia 

 Dikelocephalus newtonensis Weller, 1903, Geol. Surv. New Jersey, Rept. on 

 Pal., Vol. 3. pp, 121-122, pi. 3, figs. 1-7. (Description and illustration.) 



Specimens from the type locality now in the U. S. National 

 Museum Collections show that this species has a well-marked occipital 

 spine similar to that on specimens of C. osarkensis from Missouri 

 that appear to be almost identical with C. nezvtonensis. The former 

 differs in having a more broadly roimded frontal rim, a more trans- 

 verse frontal margin to the glabella and a larger occipital spine. 



The specimens illustrated by Weller in the New Jersey Report 

 are small and do not show the characters of the cranidium so fully as 

 the large specimens in the National Museum Collections. Photo- 

 graphs of the type (fig. 7) and cotype (fig. 6) are given on plate 60, 

 also an associated cranidium (fig. 8), free cheek (fig. 9), and pygidium 

 (figs. 10, loa). 



Formation, and locality. — Lower Ozarkian: die)' Lower part 

 of Kittatinny limestone, O'Donnell and McManniman's quarry, 

 Newton, Sussex County, New Jersey (H. E. Dickhaut, 1901), 



CALVINELLA OZARKENSIS, new species 

 Plate 70, figs. 1-6 

 This fine species is represented by the cranidium, free cheeks, and 

 an associated pygidium. The cranidium is much like that of Cak'in- 



^ By error locality iic has " Hardyston Quartzite " for Kittatinny lime- 

 stone in Monograph 51, U. S. Geol. Survey, 1912, pp. 178, 466, 539 and 784. 



