NO. 10 CAMBRIAN FOSSU.S, 4TH CONTRIBUTION RESSER 35 



much larger. The large Hbragenes — the part of this trilobite most 

 commonly preserved — are attached to a very short brim, which is 

 reduced to little more than a line, terminating in a swollen knob like 

 the rim Menouwnia. In other words Dreshachia is characterized by 

 the lateral shortening of the preglabellar area to a mere line for the 

 attachment of the Hbragenes which lies wholly in front of the glabella. 

 Besides the genotype and the species formerly referred to Millordia, 

 several new species from the Appalachian Nolichucky formation are 

 in press. 



Menomonia avitas (Walcott) 



Millardia avitas Walcott, Smithsonian Misc. Coll., vol. 64, no. 3, p. 165, 

 pi. 28, figs. 5-5e, 1916. 



Upper Cambrian, Warrior; (loc. 107k) 2 miles north of Benore, 

 Center County, Pennsylvania. 

 Holotype.— U.S.N. M. no. 61629. 



Menomonia magnagranulata (Lochman) 



Millardia iiiagiiagrauiilata Lochman, Journ. Pal., vol. 12, no. i, p. 84, pi. 18, 

 fig- 3, 1938. 



Upper Cambrian, Cap Mountain; southwest side of Lion Moun- 

 tain, Highway 29, 9 miles northwest of Burnet, Texas. 

 Holotype. — U.S.N.M. no. 95015. 



Menomonia optata (Hall) 



Coiioccphalitcs opt at us Hall, i6th Ann. Rep. New York State Cab. Nat. 



Hist., p. 222, pi. 5A, fig. 7, 1863. Trans. Albany Inst., vol. 5, p. 195, 1867. 

 Ptychoparia optata Miller, North Amer. Geol. Pal., p. 539, 1889. 

 Millardia optata Walcott. Smithsonian Misc. Coll., vol. 64, no. 3, p. 165, 



pi. 28, figs. 4, 4a-f, 1916. 



One cannot be certain that Hall's original type and the specimens 

 figured by Walcott represent the same species. At any rate Hall's 

 original is a very small specimen. 



Upper Cambrian, Eau Claire ; Willow River Falls, Trempealeau, 

 and other localities in Wisconsin and Minnesota. 



Holotype. — A.M.N.H. no. 322 ; plesiotypes, U.S.N.M. nos. 61626-8. 



Menomonia semele (Walcott) 



Millardia scmelc Walcott, Smithsonian Misc. Coll., vol. 64, no. 3, p. 166, 

 pi. 28, figs. 3-3C, 1916. 



Upper Cambrian. Weeks ; (loc. 30 n) Weeks Canyon, House Range, 

 Utah. 



Cotypes.-AJ.S.N.M. nos. 61622-5. 



