I06 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 57 



DESCRIPTION OF PLATE i6 



PAGE 



Coosia superha Walcott 94 



Fig. I. The type specimen of the species and genus, a nearly entire dorsal 

 shield with the exception of the free cheeks of the cephalon. 

 Natural size. U. S. National Museum, Catalogue No. 57589. 

 la. Side view of the specimen represented by Fig. i. Natural 

 size. 



Coosia robusta Walcott 97 



Fig. 2. Dorsal view of the type specimen, a cranidium. Natural size. 

 U. S. National Museum, Catalogue No. 57590. 

 2a. Pygidia associated with the specimen represented by Fig. 2. 

 X 2. U. S. National Museum, Catalogue No. 57591. 



AsapJiiscus iddingsi Walcott 99 



Fig. 3. A dorsal shield flattened in argillaceous shale. X 2. U. S. 

 National Museum, Catalogue No. 57586. 



Batliyiirisciis manchuricnsis Walcott 97 



Fig. 4. Fragment of shale with flattened cranidia and pygidia. X 3- 

 U. S. National Museum, Catalogue No. 57587. 



Solcnopleura chalcon Walcott 83 



Fig. 5. Dorsal view of cranidium. X 4- U. S. National Museum, 

 Catalogue No. 57588. 



