41 



the vas deferens, which, as already described, extends along the p;roove in 

 the testis. The testicular follicles, however, are enclosed in a thick coat of 

 connective tissue which conceals them. 



Reproductive Organs of the J'enuile. — Note the shape of an ovary, the 

 connection of it with the respiratory system, the position oi the oviduct 

 (which is the vessel extending caudad from the ovary), and the attachment 

 of the ligament o( the viscera. 



Make a drawing showing these things. 



Each oviduct extends caudad from the caudal end of the ovary through 

 ■masses of fat to the seventh abdominal segment, where, at a point opposite 

 the last ganglion of the nervous system, it passes under the ventral muscles, 

 and terminates in a disc-like enlargement, on the body-wall. 



Make a dissection showing this. 



Note. — In the adult the two oviducts extend caudad to near the caudal 

 end of the body where they empty into a short vagina. 



Each ovary is composed of many parallel tubes, the cgg-tubcs, in which 

 the eggs are developed, and which open into the oviduct. But as the 

 egg-tubes are enclosed in a thick coat of connective tissue, which en- 

 velopes' the entire ovary, it is necessary to break this coat in order to see 

 them. 



Remove an ovary, place it on a glass slip, tease it apart with needles, and 

 examine it with a microscope. 



Make a drawing of an egg-tube. 



The reproductive organs of a locust. — As the repro- 

 ductive organs of the larva of Corydalis are in ail immature 

 condition, it will be well for the student to study, at this 

 point in his work, the reproductive organs of an adult insect. 

 For this purpose the red-legged locust may be used. If pos- 

 sible use fresh specimens. 



The reproductive organs of the male. — Remove the wings 

 and legs from an adult male locust, make a slit in the dorsal 

 wall of the body, extending the whole length of the thora.x 

 and abdomen, spread open the specimen, pin it to a piece of 

 cor'k, and place it under water for dissection. " 



The testes lie upon the stomach, and are enclosed in a com- 

 mon sack-like envelope. This is exceptional ; in most in- 



