248 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 64 



DESCRIPTION OF PLATE 33 



PAGE 



Crepicephalus tripunctatus (Whitfield) 215 



Figs, i, 10. (X I-5-) Dorsal and side views of a cranidium which is 



the type of the species. U. S. National Museum, Catalogue 



No. 26934. 



i&. (X I-5-) Free cheek associated with fig. i. U. S. National 



Museum, Catalogue No. 26934. 



The specimens represented by figs, i, la-b are from the Upper 



Cambrian: (ssSd) Gallatin limestone ; Meagher County, Montana. 



Crepicephalus tripunctatus magnispinus Walcott 216 



Figs. 2, 2a. (X i-SO Dorsal and side views of a typical cranidium, 

 U. S. National Museum, Catalogue No. 61684. 

 2&. (Natural size.) Side view of a broken cranidium having a 

 very large occipital spine. U. S. National Museum, Cata- 

 logue No. 61685. 

 2c. (Natural size.) Dorsal and side views of a pygidium referred 

 to this species. U. S. National Museum, Catalogue No. 

 61686. 

 The specimens represented by figs. 2, 2a-c are from locality 107, 

 Maryville Hmestone; 11 miles northwest of Knoxville, Tennessee. 



Crepicephalus coria Walcott 206 



Fig. 3. (Natural size.) Interior of a fragmentary specimen, showing 



14 segments in the thorax. U. S. National Museum, Cata- 

 logue No. 61687. 

 Za, 3«'- (Natural size.) Dorsal and side views of a small, slightly 



crushed cranidium. U. S. National Museum, Catalogue 



No. 61688. 

 3fc. (X2.) Dorsal view of a small convex cranidium. U. S. 



National Museum, Catalogue No. 61689. 

 3c. (Natural size.) A large cranidium illustrating slight change 



in form with increase in size. U. S. National Museum, 



Catalogue No. 61690. 

 3d. (Natural size.) Associated free cheek. U. S. National 



Museum, Catalogue No. 61691. 

 3^. (Natural size.) Dorsal view of a broken pygidium. U. S. 



National Museum, Catalogue No. 61692. 

 3/. (Natural size.) Interior of a pygidium. U. S. National 



Museum, Catalogue No. 61693. 

 2,g- (X2.) Dorsal view of a small pygidium. U. S. National 



Museum, Catalogue No. 61694. 



The specimens represented by figs. 3, 3a-g are from locality 

 3on, Upper Cambrian: Weeks formation; House Range, Utah. 



J 



