NO. 3 



BURGESS SHALE FOSSILS WALCOTT 



19 



digestion, the ultimate or hepatic caeca secreting a digestive juice as 

 in Lcpidunis and other crustaceans having such glands.' 



Fig. 5. — Burgcssia hclla Walcott. 



ap, anal plate; as, anal somite; cs, central stomach; </.</., digestive glands; 

 d.g'., lateral digestive glands; c, eye; /;. r., hepatic caeca; ;, intestine; s' and ,?", 

 anterior lobes of stomach; sc, anterior central lobe of stomach; t, telson. 



(About X 7- ) Diagrammatic outline of digestive organs. Most of the data 

 on which this figure is based are shown by the specimens illustrated on plate 16, 

 figures I, 3 and 4. The exact relations of the anterior central lobe of the stomach 

 to the central stomach are unknown as there appears to be a line separating them. 



The anus is supposed to have heen at the last thoracic segment 

 beneath the platelike structure shown on figure 3, plate 17. 



' Parker and Haswell, Text-book of Zool., vol. i, p. 491, 1807. 



