AGELENA N^EVIA WALCKEN^R 173 



g. Examine the terminal joint of an upper spinneret under 

 high power (400 diameters). Make a drawing showing the 

 spinning tubes among the hair. 



10. Remove the epigynum with adjoining tissue, boil it in 

 20% potassium hydrate, etc. ; and examine it under high power. 

 Make a drawing showing outline of chitinous structures and 

 both receptacles. 



11. Remove two terminal joints of an immature spider, treat 

 them in the same manner and examine under high power. Make 

 a drawing showing the old claws and the new claws still inclosed 

 in the tarsus. 



12. Remove one of the pedipalpi of a mature male, treat it 

 in the same manner, and make a drawing showing the terminal 

 joint with the copulatory apparatus. Label the long, spiral 

 embolus and the soft haematodocha. 



13. Examine under microscope the series of prepared trans- 

 verse sections through a spiderling. Make at least four draw- 

 ings, one through the region of the eyes, one through the 

 pumping stomach, one through the lungs and one through the 

 abdomen in front of the spinnerets. Label all organs. 



14. Examine under microscope the prepared slide with a series 

 of sagittal sections through a spiderling. Choose the section 

 showing both heart and nervous system. Make a drawing 

 showing all organs. Label also all neuromeres in accordance 

 with the somites. 



