236 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 64 



DESCRIPTION OF PLATE 27 



PAGE 



Norwoodia saffordi Walcott 171 



Fig. I. (X4-) Portion of cranidium showing glabellar furrows. 

 U. S. National Museum, Catalogue No. 61595. 



la. (X4-) Broken and compressed cranidium. U. S. National 

 Museum, Catalogue No. 61596. 



i&. (X3-) Free cheek. U. S. National Museum, Catalogue No. 

 61597- 



ic. (X4-) A small, almost entire cranidium. U. S. National 

 Museum, Catalogue No. 61598. 



id (X4-) A nearly entire dorsal shield with eight thoracic seg- 

 ments. U. S. National Museum, Catalogue No. 61599. 



le. (X4-) Pygidium associated with this species. U. S. National 

 Museum, Catalogue No. 61600. 



if. Diagrammatic side outline of cranidium. 



All of the specimens illustrated are from the Middle Cambrian : 

 (103, 103a) Rome formation, south of Rogersville, Hawkins 



County, Tennessee. 



Norwoodia gracilis Walcott 169 



Fig. 2. (X4-) Entire dorsal shield as photographed and drawn from 

 an imperfect specimen with damaged portions restored 

 from associated specimens. U. S. National Museum, Cata- 

 logue No. 61601. 



2a (X3) and 26 (XS)- Cranidia illustrating form. Fig. 26 is a 

 younger stage of growth. U. S. National Museum, Cata- 

 logue Nos. 61602 and 61603. 



2c. (X4-) Ventral side of a distorted cephalon. U. S. National 

 Museum, Catalogue No. 61604. 



2d. (X4-) Ventral side of a small cranidium. U. S. National 

 Museum, Catalogue No. 61605. 



2e. (X8.) A small pygidium associated with specimens repre- 

 sented by figs. 2a-b. U. S. National Museum, Catalogue 

 No. 61606. 



2/. (X2.) Thoracic median spines. U. S. National Museum, 

 Catalogue No. 61607. 



2g. (X3-) Cranidium and a long thoracic median spine. U. S. 

 National Museum, Catalogue No. 61608. 



All the specimens illustrated are compressed in the Upper Cam- 

 brian fine Conasauga shale as they occur at (90a) Cedar Bluff 

 and (92X) Yanceys Bend, on the Coosa River, Cherokee County, 

 Alabama. 



