NO. 3 CAMBRIAN AND OZARKIAN TRILOBITES II7 



TAENICEPHALUS SHUMARDI (Hall) Ulrich and Resser 



Plate 17, figs. 15-17 



Conocephalites shunmrdi Hall, 1863, i6th Ann. Rept. New York State Cab. 



Nat. Hist., p. 154, pi. 7, figs. I, 2; pi. 8, figs. 32, 19?. 1867, Trans. 



Albany Inst, Vol. 5, p. 138, pi. 2, figs, i, 2; pi. 3, figs. 32, 19?. 

 Conaspis shumardi Hall, 1863, i6th Ann. Rept. New York State Cab. Nat. 



Hist., p. 152. Walcott, 1914, Smithsonian Misc. Coll., Vol. 57, No. 13, 



p. 357. (List.) 

 Ptychoparia shumardi Miller, 1889, North American Geol. and Pal., p. 565. 



(Generic reference.) 

 Taenicephalus shumardi Ulrich and Resser in Walcott, 1924, Smithsonian 



Misc. Coll., Vol. 75, No. 2, p. 59, pi. 13, fig. I. 



Hall's original description of this species is quite complete, so that 

 nothing need be added for the present. 



F ormation and locality. — Upper Cambrian : Franconia formation, 

 Trempealeau, Wisconsin. 



Genus TOSTONIA Walcott 



Tostonta Walcott, 1924, Smithsonian Misc. Coll., Vol. 75, No. 2, pp. 59, 60. 



Description. — Of this genus, only a few specimens of the cranidium 

 and an associated pygidium have been found. The cranidium, by its 

 almost quadrate outline, strong dorsal furrows, subquadrate glabella 

 with two pairs of oblique furrows, narrow frontal limb and rim, 

 small palpebral lobes and narrow fixed cheeks, relates the genus to 

 Olcnus. The associated pygidium has a strong convex axis, and 

 pleural lobes with distinctly outlined segments that terminate in 

 points without an intervening rim much as in the pygidia referred 

 to Apatokephalus. 



Genotype. — Dicelloccphalus iolc Walcott. 



Range. — ^Upper ? Cambrian : Hamburg limestone, Eureka District, 

 Nevada. 



TOSTONIA lOLE (Walcott) 



Plate 18, figs. 10-14- 



Dicellocephalus iolc Walcott, 1884, Monogr. U. S. Geol. Surv., Vol. 8, p. 43, 

 pi. 10, fig. 19. (Description and illustration of cranidium.) 



Tostonia iolc Walcott, 1924, Smithsonian Misc. Coll., Vol. 75, No. 2, p. 60, 

 pi. 13, fig. 2. 



The original description outlines the characters of the cranidium. 

 Formation and locality. — Upper ? Cambrian : (64) Hamburg lime- 

 stone, near the Bullwhacker Mine, Eureka District, Nevada. 



