— 37 — 



The ligament of the viscera is not attached to the body- 

 wall, but is supported by a large trachea in the third abdomi- 

 nal segment, about which it forms a collar. This suspen- 

 sorium has three branches ; one of these extends caudad to 

 the testis or ovary ; one, cephalad, to the heart ; and the 

 third, to the intestine. This last branch receives the tendon 

 of one of the branches of the branched suspensory muscle. 



Make a drawing representing the alimentary canal in the 

 center, a testis or ovary on each side (these are described in 

 the next section), and the three pairs of suspensoria. While 

 doing this the provisional sketches already made can be 

 utilized, but the observations should be confirmed by a study 

 of the suspensoria of the other side of the specimen. 



Cut the trachea supporting the ligament of the viscera, 

 and slip the ligament off from it ; cut the ligament extending 

 to the heart as near to the heart as practicable ; cut the liga- 

 ment extending to the intestine, between the intestine and 

 the tendon of the branched suspensory muscle ; cut the 

 branched suspensory muscle as far cephalad as practicable ; 

 cut off the tip of the testis or ovary, leaving it attached to the 

 ligament ; mount the preparation thus made in glycerine for 

 study with the microscope, carefully spreading apart the 

 branches of the ligament and the end of the suspensory 

 muscle with a needle before putting on the cover-glass. 

 Study this preparation with a high power of the microscope 

 and note the difference in structure between the suspensory 

 muscle and the ligament of the viscera. Make a drawing 

 showing this. 



The suspensory nerves of the alimentary canal extend from 

 the small intestine to the last abdominal ganglion. They 

 can be best seen in a specimen opened on the dorsimeson, 

 and will be described later. 



The Reproductive Organs. — Although there appears to 

 be no external characteristic by which the sexes of the larva 

 of Corydalis can be distinguished, the internal reproductive 



