78 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 75 



Genus BYNUMIA Walcott 



Bynumia Walcott, 1924, Smithsonian Misc. Coll., Vol. 75, No. 2, p. 54. 



Observations.— Bynumia is a small trilobite closely related to 

 Kingstonia and several undescribed genera. In the shape and obscure 

 definition of the glabella and in the general configuration of the 

 posterior portion of the cranidium, it agrees almost exactly with 

 Kingstonia. It differs in the following points: (i) The eyes are 

 situated just about opposite the middle of the glabella and farther 

 back than in Kingstonia. (2) The front of the cranidium is narrower 

 and more produced in the middle varying from obtusely angular to 

 narrowly rounded in outline. (3) The cranidium lacks a frontal rim. 

 The last character suggests that the rim is on the free cheeks and 

 that the suture is intramarginal. 



No pygidium that can be referred with this head has been dis- 

 covered in the collections containing the type cranidium, but with 

 other species there is associated a form not very unlike the pygidium 

 of Kingstonia, which may belong to this genus. 



Genotype. — Bynumia eumus Walcott. 



Range. — The type species occurs in the Upper Cambrian Lyell 

 formation of British Columbia. Two other species are known, one 

 from the Maryville limestone of Tennessee and a second from the 

 Lower Ozarkian of St. Albans, Vermont. 



BYNUMIA EUMUS Walcott 



Plate 17, figs. 4-6 



Bynumia cumus Walcott, 1924, Smithsonian Misc. Coll., Vol. 75, No. 2, 

 p. 54, pl- 14, fig. 3- 



The illustrations exhibit the known characters of this species. 



Formation and locality. — Upper Cambrian: (66m) Lyell forma- 

 tion. Second canyon northwest of Mt. Edith, 4.75 miles (7.6 km.), 

 Sawback Range. (64b) Lyell formation. Head of Glacier Lake, 

 Canyon valley, about 48 miles (77.2 km.) northwest of Lake Louise, 

 Alberta, Canada. 



Genus CEDARIA Walcott 



Cedaria Walcott, 1924, Smithsonian Misc. Coll., Vol. 75, No. 2, p. 55. 



Description. — The genus Cedaria includes a number of species 

 which have long been Icnown in the collections but of which only 

 one has been described (Agraulos tvoosteri Whitfield). 



