400 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 53 



DESCRIPTION OF PLATE 33 



PAGE 



P(Tdeiimias transttans, new genus and new species (See pis. 24, 25, 32, 34, 



41, and 44) 305 



Fig. I. A large, broad specimen witli three rudimentary thoracic seg- 

 ments posterior to the fifteenth spine bearing segment. 

 Natural size. The posterior three segments and pygidium 

 are illustrated on plate 24. From locality (25), Parkers 

 quarry, Georgia, Vermont. U. S. National Museum, Cata- 

 logue No. 568080. 



2. Posterior portion of a dorsal shield from which the upper por- 



tion of the great spine of the fifteenth thoracic segment has 

 been removed. It shows the pygidium, four rudimentary seg- 

 ments, and the impression of the under side of the great spine. 

 X 3- U. S. National Museum, Catalogue No. 56810W. 



3. Photograph from cast in natural matrix of posterior segments, 



telson, and traces of rudimentary segments and pygidium rep- 

 resented by fig. 2. X 3- U. S. National Museum, Catalogue 

 No. 56810W. 



4. View of another specimen similar to that represented by fig. 3. 



X 3- This is the exterior of the great spine that is removed in 

 fig. 5. U. S. National Museum, Catalogue No. 568100. 



5. This is the posterior portion of the dorsal shield that is the re- 



verse of the matrix from which the cast represented by fig. 4 

 was taken. The telson is broken away so as to show the 

 fifteenth segment to which the great spine was attached, and 

 joined to this the first, second, and third rudimentary seg- 

 ments and the plate pygidium. X 3- U. S. National Museum, 

 Catalogue No. 56810/'. 



The specimens represented by figs. 2-5 were collected by 

 Prof. Atreus Wanner from locality (8q), 2 miles northwest of 

 York, Pennsylvania. 



