442 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 64 



DESCRIPTION OF PLATE 60 



PAGE 



Asaphiscus calenus Walcott 384 



Fig. I. (X 2.) Entire dorsal shield. The right free cheek and frontal 

 limb are restored. U. S. National Museum, Catalogue No. 

 62765. 



la. (X2.) Interior of a dorsal shield with the right free cheek 

 restored. U. S. National Museum, Catalogue No. 62766. 



lb. (X2.) Pygidium and attached thoracic segments. U. S. Na- 

 tional Museum, Catalogue No. 62767. 



ic. (X2.) A broken cephalon preserving the strong palpebral 

 (ocular) ridge and glabella furrows. U. S. National 

 Museum, Catalogue No. 62768. 



The specimens represented by figs, i, la-c are compressed in a fine 

 argillaceous shale at locality sf , Middle Cambrian : Wolsey shale ; 

 II miles south of Neihart, in Meagher County, Montana. 



Asaphiscus camma Walcott 384 



Fig. 2. (X3-) A small dorsal shield illustrating the character of the 

 species. U. S. National Museum, Catalogue No. 62769. 

 2a. (X2.) A cranidium preserving strong palpebral ridges. U. S. 



National Museum, Catalogue No. 62770. 

 26. (Natural size.) Pygidium. U. S. National Museum, Catalogue 



No. 62yyi. 

 2c. (X4-) Hypostoma associated with this species. U. S. Na- 

 tional Museum, Catalogue No. 62772. 



The specimens represented by figs. 2, 2a-c are compressed in a fine 

 argillaceous shale at locality 4g, Middle Cambrian : Wolsey shale ; 

 5 miles east-northeast of Logan, Gallatin County, Montana. 



Corynexochus (Bonnia) busa Walcott (see pi. 57, fig. la) 326 



Figs. 3, 3'. (X 3-) Top and side views of a broken cranidium that 

 retains its convexity. U. S. National Museum, Catalogue 

 No. 62773. 

 ^a, 3a'. (X4-) Top and side views of a small, finely preserved 

 pygidium. U. S. National Museum, Catalogue No. 62774. 

 3b. (X 10.) Surface .of axial lobe of pygidium of specimen repre- 

 sented by fig. 3a. 

 3c. (X8.) Surface of glabella of specimen represented by fig. 3. 



The specimens represented by figs. 6, 6a-c occur in a compact gray 

 limestone at locality 2 o, Lower Cambrian : Bic Harbor, Province 

 of Quebec, Canada. 



