228 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 57 



DESCRIPTION OF PLATE 34 



PAGE 



Hurdia iriangulata Walcott 186 



Fig. I. (Natural size.) Typical form of valve (right). U. S. 

 National Museum, Catalogue No. 57721. 



Odaraia alata Walcott 188 



Fig. 2. (Natural size.) A right valve with the end of the abdomen 

 and two cercopods projecting from posterior end. The latter 

 are evidently displaced. U. S. National Museum, Catalogue 

 No. 57722. 



Anomalocaris gigantea Walcott 180 



Fig. 3. (Natural size.) Portion of the abdomen showing segments and 

 appendages. U. S. National Museum, Catalogue No. 57723. 



All of the specimens illustrated on Plate 34 are from locality (35k) Middle 

 Cambrian : Burgess shale member of the Stephen formation, on the west slope 

 of the ridge between Mount Field and Wapta Peak, one mile (1.6 km.) north- 

 east of Burgess Pass, above Field, British Columbia. 



