135 



Fig. 32. Trans, section of rods. Zeiss apo. 1"5. 

 Fig. 33. Trans, section of retinopliorae. Zeiss, apo. 1'5. 

 Fig. 34. Argentea in snrface view. Zeiss apo. 1"5. 

 Fig. 35. Epithelial cells of eye stalk. Trans, sect. 

 Zeiss apo. 1"5. 



Plate VIII. 



Fig. 36. Alimentary canal of P . maximus. K^at. size. 



Fig. 37. Trans, sect, throngli upper part of descending 

 loop of intestine, showing division into two 

 compartments. x 40. 



Fig. 38. Left inside of stomach, showing cavities into 

 which ducts open. 



Fig. 39. Mouth, lips (separated) and labial palps. 



Fig. 40. Section of internal labial palp, across ridges. 

 X 66. 



Fig. 41. Crystalline style of F. tnaxi7nus, showing two 

 conditions. Natural size. 



Fig. 41rt. Trans, section through crystalline style. x 7. 



Fig. 42. Section of wall of intestine (same plane as 

 fig. 37), showing cells of crystalline style 

 cavity, x 244. 



Fig. 43. Section of posterior part of ventricle and 

 rectum. x 25. 



Fig. 44. Wall of rectum, same section as fig. 43. x 300. 



Fig. 44(7. Wandering excretory cell [Ex.). x 300. 



Fig. 45. Trans, section of ctenidial axis and bases of 

 filaments, showing latter opening into afferent 

 branchial vessel, x 16. 



