394 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 53 



DESCRIPTION OF PLATE 30 



PAGE 



Wanneria zvalcottaiius (Wanner) (See pis. 31 and 44) 302 



Fig. I. An entire adult specimen flattened in the shales and with the 

 test largely exfoliated. Natural size. U. S. National Museum, 

 Catalogue No. 56807a. 



2. A well preserved flattened cephalon. Natural size. U. S. Na- 

 tional Museum, Catalogue No. 56807&. 



3 and 4. Small cephalons showing the increase in the size of the eye 

 in the younger stages of growth. Natural size. In Wanneria 

 halli (pi. 31) this feature of the cephalon is more fully illus- 

 trated. U. S. National Museum, Catalogue Nos. 56807c and 

 56807^, respectively. 



5. Hypostoma crushed and displaced from its true position in rela- 



tion to the doublure of the cephalon. Natural size. U. S. 

 National Museum. Catalogue No. 568076'. 



6. Cast of the under side of the doublure of the cephalon, with 



casts of the spines along its posterior margin. Natural size. 

 U. S. National Museum, Catalogue No. 56807/. 



7. An unusually well preserved hypostoma with six spines on each 



postero-lateral margin. Natural size. U. S. National Museum, 

 Catalogue No. 56807^. 



The specimens represented by figs. 5, 6, and 7 were figured by 

 Wanner [1901, pi. 32, figs. 2, i, and 3, respectively]. 



8. Distorted pygidium of an adult individual from near York, 



Pennsylvania. X 3- U. S. National Museum, Catalogue No. 

 56807/?. 

 g. Cast of the under side of the genal spine and the doublure. 

 X 2. Note the cast of the small spines on the margin of the 

 doublure. U. S. National Museum, Catalogue No. 56807/. 

 TO. Matrix of a pygidium and five posterior thoracic segments. X 2. 

 Note the cast of the median spine at the third segment from 

 the pygidium. U. S. National Museum, Catalogue No. 56807;. 



11. Posterior portion of a large individual preserving a strong spine 



on the axial lobe of the third thoracic segment from the 

 pygidium, also, a small spine on the fourth segment. Natural 

 size. U. S. National Museum, Catalogue No. 56807L 



12. Pygidium and five posterior, thoracic segments with base of 



strong spine on third segment and small spine on fourth seg- 

 ment from the pygidium. X 2. U. S. National Museum, Cata- 

 logue No. 56807/. 



The specimens represented by figs. 5-7, 9-12, were collected 

 by Prof. A. Wanner. The greatest addition to our informa- 

 tion of the species is furnished by figs. 11 and 12. 



All of the specimens represented on this plate are from 

 locality (Sq) , 2 miles northwest of the city of York, Pennsyl- 



