NO. 3 BURGESS SHALE FOSSILS WALCOTT 43 



5. (X4-) Specimen showing the expanded joints of the endopo- 

 dites of the cephalic hmbs. 



6- (X3-) Partly side view of a crushed and distorted specimen 

 illustrated for the purpose of showing the exopodites that 

 occur near the body, the proximal part of the endopodites 

 with the protopodites having been flaked off from above the 

 exopodites in the specimen ; in their natural position the 

 exopodites were probably above and between the endopodites. 

 The outer ends of the long, strong endopodites are well 

 shown in this specimen, although the joints have been ob- 

 scured. The slender jointed leglike structure associated with 

 the exopodites may be the distal part of the endopodites of the 

 right side. 



Plate 17 



PAGE 



Burgcssia bella Walcott 15 



Fig. I. (X3-) Another specimen preserving mainly the " skeleton." 



2. (X2.) A small individual crushed obliquely. 



3- (X3.) Ventral view of a specimen preserving the reflected 

 anterior margin and labrum, also the antennae, outlines of 

 the inner portions of the cephalic limbs, and more or less 

 distinctly outlined thoracic endopodites with transversely ex- 

 panded joints. The anal plate is clearly indicated, also the 

 anterior end of the telson. 



4. (X4-) Side view of a crushed specimen preserving on the left 

 lower side the outlines of 10 thoracic legs, on the right side 

 the outlines of four entire lobelike exopodites and the distal 

 end of four posterior to them. The exopodites still show 

 slight traces of fine filaments (?) along the posterior and 

 outer margins. 



Plate 18 



PAGE 



Burgcssia bclla Walcott 15 



Fig. I. (X2.) An incomplete specimen showing the manner in which 

 the limbs project beyond the carapace. 



Waptia fieldensis Walcott 20 



Fig. 2. (X4-) Side view of a flattened specimen preserving six or more 

 cephalic limbs, the limbs from both sides being more or less 

 crushed down together. 

 3. (X2.) Specimen showing on the right side a flattened uninjured 

 antennae in its natural form, and on the left side only the out- 

 line of the interior of the joints. The latter mode of occur- 

 rence is quite common for the antennae and other appendages. 

 This specimen also has the stalked eye preserved on the 

 right side. 



