572 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Fig. 27. Arterial system of the abdomen. The vessel 

 5. A bd. runs on the surface of the liver, 

 the vessel seg. a. underneath on the muscle. 



Fig. 28. Heart, latero-dorsal view, x 6. 



Fig. 29. Excretory system. The left epigastric lobe, 

 all the other organs of body, the muscles 

 and the abdomen have been removed. 

 Semidiagrammatic. x 2. 



Fig. 30. Second antenna from below to show the 

 excretory orifice. x 3. 



Fig. 31. Excretory system. Section of wall of 

 nephrosac. x 290. 



Fig. 32. Section of portion of antennary gland to show 

 the cells of the endsac and labyrinth, 

 x 180. 



Fig. 33. The Eye. Longitudinal section (semi- 

 diagrammatic) of an ommatidium, very 

 greatly magnified (modified after Hesse 

 and Schneider). 



Fig. 34. The Eye. Diagram of a proximal retinular 

 cell (modified after Parker). 



Fig. 35. The left auditory sac (statocyst) with the 

 surrounding tissues removed. The sac has 

 been cut open from the dorsal surface to 

 expose the sensory region. x ca. 23. 



Fig. 36. Plumose seta from the statocyst, very greatly 

 magnified. 



Plate V. 



Fig. 37. Nervous system of the cephalothorax from 

 above. The nerves have been cut short 

 before they enter the appendages, x ca. \\. 



Fig. 38. Nervous system. The abdominal ganglia and 

 their connective and branches, x 2. 



