502 Dr. H. A. Baylis on 
P. semiteres the alee stood out as prominent triangular struc- 
tures in the sections, in P. ensicaudatum no such structures 
Fig. 5. 
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Fig. 5.—Porrocecum semiteres. Posterior: portion of cesophagus and 
anterior portion of intestine. ¢., intestinal ceecum; zt., in- 
testine ; oes., oesophagus ; v., ventriculus, 
Fig. 6.—Porrocecum ensicaudatum, Posterior portion of cesophagus and 
anterior portion of intestine. Lettering as in fig. 5 (in this case 
the ceecum (c.) is rudimentary). 
could be seen. In P. ensicaudatum also the intestinal caecum 
(fig. 6, c.) is usually quite rudimentary, and never appears to 
