NO. 3 CAMBRIAN TRILOBITES 235 



Dresbachia amata Walcott — Continued. page 



50,50'. (X4-) Dorsal view and side outline of a broken crani- 



dium. U. S. National Museum, Catalogue No. 61586. 

 5fc. (X2.) Free cheek associated with cranidia of this species. 



U. S. National Museum, Catalogue No. 61587. 

 5c. (X2.) A narrow form of free cheek associated with cra- 

 nidia of this species. U. S. National Museum, Catalogue 

 No. 61588. 

 The specimens represented by figs. 5 and 50 are from locality 

 79X, north of Galesville, Trempealeau Coiinty, Wisconsin. The speci- 

 men represented by fig. 5& is from locality 84, Dresbach, Winona 

 County Minnesota, and 5c, from gSx, Eau Claire, Eau Claire 

 County, Wisconsin. All are from the Upper Cambrian, Eau 

 Claire formation of Wisconsin and Minnesota. 



Alokistocare ticida Walcott 187 



Fig. 6. (Natural size.) A broken, weather-worn cranidium. U. S. 

 National Museum, Catalogue No. 61589. 

 6a. (Natural size.) Interior surface of a broken cranidium. U. S. 

 National Museum, Catalogue No. 61590. 

 The specimens represented by figs. 6 and 6a are from locality 

 55s, Middle Cambrian : Bloomington formation. Blacksmith Fork 

 Canyon, Cache County, Utah. 



Acrocephalites ? glomeratus Walcott 179 " 



Figs. 7, ya. (Natural size.) Top view and side outline of the type 

 cranidium. U. S. National Museum, Catalogue No. 61591. 

 From locality 340c, Upper Cambrian : Rawlins, Carbon County, 

 Wyoming. 



Amphion ? matutina Hall 219 



Figs. 8, 8a. (X4.) Dorsal view and side outline of a cranidium. 

 U. S. National Museum, Catalogue No. 61592. 

 The specimen illustrated is from locality 84, Upper Cambrian : 

 Eau Claire formation; Dresbach, Winona County, Minnesota. 



Acrocephalites ? aster Walcott 178 



Figs. 9, ga. (X3-) Top view and side outline. The side outline 

 from the occipital segment is traced from a second speci- 

 men. U. S. National Museum, Catalogue No. 61593. 

 From locality 107c, Upper Cambrian: Maryville limestone; 11 

 miles northwest of Knoxville, Tennessee. 



9b. (X3.) Cranidium compressed in shale. It shows tubercles 

 more strongly than the specimen represented by fig. 9, 

 which occurs in limestone. U. S. National Museum, Cata- 

 logue No. 61594. 

 gc. (Natural size.) This is the same specimen as that represented 

 by fig. gb. 

 The specimen represented by figs, gb and gc is from locality 3586, 

 Upper Cambrian : Conasauga formation ; Birmingham City, Ala- 

 bama. 



