NO. 24 PTARMIGANIA STRATA RESSER 25 



AGNOSTIA 



AGNOSTIDAE M'Coy 



AGNOSTUS BRONGNIART, 1822 



AGNOSTUS LAUTUS, n. sp. 



Plate 2, figs. 16-18 



This species is similar to the many others in the Middle Cambrian, 

 of which A. montis is the best known. A. lautus is so much like 

 other species in the Wasatch region that it was hoped it could be put 

 into one of them. It is rather close to A. brighamensis, for the various 

 furrows and proportions throughout are proportional in both species. 

 But A. lautus does not have the even, semicircular outline of A. 

 brighamensis because of the flattening of the front of the cranidium 

 and of the sides and rear margins of the pygidium. 



Locality 54s. 



Cotypes.— U.S.N. M. Nos. o^oa-c. 



TRILOBITA 



PAGETIDAE Kobayashi 



PAGETIA Walcott, 1916 



PAGETIA MALADENSIS, n. sp. 



Plate 2, figs. 4, 5 



This is a rather smooth species of Pagetia. The cranidium has a 

 long narrow glabella, well-defined eye lines, and a wide preglabellar 

 area, as well as the usual rim structure. The species is of average 

 size. Aside from the narrow glabella, two other features separate it 

 from P. clytia, namely, the weakness of the median furrow across the 

 preglabellar area and the absence of indentations on the brim. The 

 pygidium, regarded as representative of the species, differs from that 

 of P. clytia in the greater fusion of the pleural lobes carried to the 

 point where furrows are no longer visible. There are the usual axial 

 spines. 



Locality 54s. 



Holotype and paratype.—U .S.N .M. Nos. 98491a, b. 



PAGETIA CLYTIA Walcott 



Plate 2, figs. 5-8 



Pagetia clytia Walcott, Smithsonian Misc. Coll., vol. 64, No. 5, p. 408, pi. 67, 

 figs. 2-2e, 1916. — Raymond, Mem. Connecticut Acad. Sci., vol. 7, p. 145, 

 fig. 37, 1920. — Resser, Smithsonian Misc. Coll., vol. 97, No. 12, p. 8, pi. 2, 

 figs. 30-32, 1939- 



