Il6 THE APPENDAGES, ANATOMY, AND RELATIONS OF TRILOBITES. 



Further information about this fossil will be eagerly awaited. None of the illustra- 

 tions so far published shows biramous appendages on the cephalon. This, coupled with the 

 presence of tactile antenrue, makes its reference to the Trilobita impossible, but the 

 present interpretation indicates that it was closely allied to them. 



Fig. 32. Marrclla splendens Walcott. Restoration of the ventral surface, based upon the 

 photographs and descriptions published by Walcott. Although all the limbs of the trunk 

 appear to be biramous, only endopodites are placed on one side and exopodites on the other, 

 for the sake of greater clearness in the illustration. Drawn by Doctor Elvira Wood, under 

 the supervision of the writer. X about 6. 



Restoration of Marrclla. 

 (Text fig. 32.) 



The accompanying restoration of the ventral surface of Marrclla is a tentative one, 

 based on Doctor Walcott's description and figures. The outline is taken from his plate 26, 

 figure i ; the appendages of the head from plate 26, figures 1-3, 5, and plate 25, figures 2, 

 3 ; the endopodites, shown on the left side only, from figures 3 and 6, plate 25. I have not 

 studied actual specimens, and the original description is very incomplete. The restoration is 

 therefore subject to revision as the species becomes better known. 



