NO. 3 



BURGESS SHALE FOSSILS WALCOTT 



21 



Carapace. — The carapace when viewed from its dorsal side is elon- 

 gate, narrowed anteriorly, expanded posteriorly, and has the outline 

 of two broad lobes by the incurving of the rounded posterior margin 



Fig. 6. — U'aptia ficldciisis Walcott. 



a, antennae ; a', antennules ; a. I., abdominal limbs ; a. o., anal opening ; c, 

 carapace; c. /., caudal furca; c.l., cephalic limbs; e, eye; en, endopodite (??) ; 

 ex, exopodite ; h.c, hepatic caeca; ;, intestine; r.p., rostral plate; sli.yL, shell 

 gland ; st, stomach ; th. I., thoracic leg. 



(About X3-5.) Diagrammatic outline of ventral view of appendages and 

 digestive organs. Most of the data on which this figure is based are shown by 

 specimens illustrated on plates 19 and 20. 



towards the median line ; when folded over on its longitudinal axis 

 each side is a long semi-oval with the narrow end in front ; there is 

 no evidence of the presence of a longitudinal median line or hinge 

 in the many specimens collected from the Burgess shale. 



