i6 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 85 



Fig. 3. — Burgess'ia hclla Walcott. 



o, antennae; ap, anal plate; as, anal somite; c, carapace; d, doublure; cii, 

 endopodite ; ex, exopodite; lb, labrum ; 111, mandibles; m', maxillae; in", maxil- 

 lulae ; t, telson. 



(About X 7-) Diagrammatic outline of ventral side with appendages. Much 

 of the data on which this figure is based are shown by the specimens illustrated 

 on plates 16 and 17. The exact form and position of the proximal joints of the 

 cephalic limbs is unknown, but their general outline and position are about as 

 outlined. The thoracic limbs, especially the endopodites, are well preserved in 

 several specimens, but the exopoditcs are rarely seen and then only as faint and 

 delicate impressions on the shale. The protopodites are fairly well defined, also 

 the trunk segments and telson. The posterior endopodite and exopodite both 

 differ from those anterior to them. 



