PLATE 11. 



Chaetoderma bacillum. Section near junction of pharynx and stomach. 



Section at level of suprarectal commissure. 



Section at level of coelomoduct openings to exterior. 



Spicules from middle of body. X 146. 



Chaetoderma bacillum. Anterior end. 



Section slightly anterior to opening of gut into cloaca. 



Chaetoderma squamosum, entire animal. X 3. 



Section shghtly anterior to junction of pro- and metathorax. X 35. 



Spines from mid section of body. X 91. 



Cross section of body at level of radula. 



Section at level of brain. 



Section about level of middle of pericardium. 



Section near junction of pharynx and stomach. 



Section through anterior end of metathorax. 



Section at level of dorso-terminal groove and coelomoduct outlets. 



Junction of pro- and metathorax. 



Anterior end of young specimen of Chaetoderma vadorum. 



