URINARY ORGANS OF THE AMPHIPODA. 
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though no lumen is seen. In oonsequence of the obliquity of the section the 
liver tubes also are only cut through on one side. 
Fig. 4. — Longitudinal vertical section through part of the alimentary canal 
of Gammarus pulex. The opening of one of the urinary tubes is seen, 
and the continuity between the epithelium of the latter and that of the mid 
gut. At the point X is seen the clear termination of the mid gut, and com- 
mencement of the hind gut. The muscular fibres of the hind gut are seen in 
section. 
FiG. 5. — A diagrammatic representation of the internal organisation of 
Gammarus, showing the relative position of the urinary tubes. 
