NO. 3 BURGESS SHALE FOSSILS WALCOTT 4I 



Plate 1 i 



PAGE 



Ayshca'ia pedimculata Walcott 8 



Fig. I. (X2.) An unusually perfect specimen. 



2. Large coiled specimen that Doctor Walcott regarded as possibly 

 representing a different animal, but which may appear odd 

 only because of its unusual attitude. 



Plate 12 



PAGE 



Lcanchoilia supcrlata Walcott 8 



Fig. I. (X-2.) Retouched figure of a fragmentary specimen. 



2. Natural size unretouched photograph of a well preserved indi- 



vidual. 



3. Enlarged, retouched figure of the counterpart of the preceding 



figure. 



Plate 13 



page 



Lcanchoilia supcrlata Walcott 8 



Fig. I. (X3?)- An appendage apparently belonging to this species. 

 2. An individual flattened out in the horizontal plane, thus giving it 

 an unusual aspect. 



Leanchoilia major, new species 10 



Fig. 3. Illustration of the holotype. 



A^araoia coinpacta Walcott 10 



Fig. 4. ( X 3. ) An unretouched photograph of a good specimen. The 

 appendages are only faintly shown extending beyond the 

 carapace at the rear of the specimen. (See pi. 15, fig. 3.) 



Pl.\te 14 



page 



Naraoia coinpacta Walcott 10 



Fig. I. (X2.) Dorsal view of a compressed and somewhat distorted 

 specimen, on which the outline of the body trunk is well 

 shown and, on the left side, the ends of 16 exopodites pre- 

 serving their fine filaments. 



2. (X 2.) Dorsal view of a specimen with the carapace shortened 



nearly one-half by compression. The central portion showing 

 the hepatic glands or caeca is unusually well preserved. The 

 posterior dorsal shield has the outlines of the fused segments 

 and the outer border clearly indicated, and on the left side, 

 where a piece is broken out, two of the exopodites are seen, 

 and at the posterior margin, traces of endopoditcs. 



3. (X3-) Enlarged view of a specimen witli peculiar features 



along the axis. 



Lcanchoilia supcrlata Walcott 8 



Fig. 4. (X2. ) Details of a separate appendage. 



5. (X 2.) Another appendage of a different type. 



