26 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 97 



Middle Cambrian, Ptarmigan; (loc. C3J) Popes Peak, 1^ miles 

 southwest of Stephen, and (loc. 35c) Moimt Bosworth, British 

 Columbia. 



Cotypcs. — U.S.N.M. no. 63723. 



COLEOLOIDES Walcott, 1890 



Coleoloides hectori (Walcott) 



Hyolithellus hectori Walcott, Smithsonian Misc. Coll., vol. 67, no. 2, p. 27, 

 pi. 5, fig. I, 1917. 



This species is referred to Coleoloides on the basis of its shape and 

 the presence of striations. It differs from C. typicalis in that the 

 striations are coarser, and the tube itself is of greater diameter. Too 

 little of the tube preserves the striated outer surface to show whether 

 the striations in C. hectori have a spiral course, but they seem to be 

 slightly off parallel position in the short portion preserved. 



Middle Cambrian, Ross Lake; (loc. 35c) i mile east of Hector, 

 Mount Bosworth, British Columbia. 



Holotype.—IJS.^M. no. 63721. 



AGNOSTIDA 

 AGNOSTUS Brongniart, 1822 



Agnostus yellowstonensis, n. sp. 



Agnostiis bidcns Walcott, U. S. Geol. Surv. Mon. 2>2, pt. 2, p. 455, pi. 63, 

 figs. 4, 4a, 1899. 



This species is not the same as the Middle Cambrian A. hid ens 

 Meek. It is characterized by strong dorsal furrows in both shields, 

 the anterior glabellar lobe being sharply separated. The published 

 illustration of the pygidium is misleading because the artist failed 

 to eliminate perspective when drawing the convex shield and there- 

 fore extended the axis too far rearward. In fact the space between 

 the rhachis and rear margin is half the width of the i)leural lobes. 



Upper Cambrian, Dry Creek; (loc. 151c) Crowfoot Ridge, Gallatin 

 Range, Yellowstone National Park, Wyoming. 



Cotypes. — U.S.N.M. no. SS--^-- 



TRILOBITA 



BAILIELLA Matthew, 1885 



BailicUa Resser, Smithsonian Misc. Coll., vol. 95, no. 4, p. 15, 1936. 



Several species must be added to the list published in 1936. Some 

 of them were overlooked, one correction was expected to appear else- 

 where and others have since been described under Conocoryphe. 



