— 3 6 — 



and proventriculus, after they emerge from the layer of 

 muscles and fat. 



Study first the suspeusoria of one side of the specimen, 

 leaving those of the other side for study when the final draw- 

 ing is made. In the following notes a single member of 

 each pair of suspensoria is described. 



The two suspensory muscles may be designated as the 

 simple suspensory muscle and the branched suspensory 

 muscle, respectively. 



The simple suspensory muscle arises from near the middle 

 of the ental surface of the pronotum, and extends caudad to 

 the gastric cseca, where the fibres of which it is composed 

 spread apart, some going to one caecum and some to the other. 



Make a provisional sketch of this. 



With fine-pointed scissors, cut off the tips of the two 

 gastric caeca of this side, and remove them with as long a 

 piece of the suspensory muscle as is practicable, and mount 

 them "in glycerine for study with a high power of the micro- 

 scope. Note the transversely striated appearance of the 

 fibres of this suspensorium. This indicates that it is com- 

 posed of striated muscular tissue. 



Make a careful drawing showing the minute structure of 

 this suspensorium. 



The branched suspensory muscle arises from the ental sur- 

 face of the body- wall, on the dorsal side, between the meso- 

 thoracic and metathoracic shields, near the lateral margin of 

 the body and extends caudad into the cavity of the abdomen ; 

 here it divides into several branches. One branch extends 

 to the ventriculus ; one or more to the masses of fat and to 

 the Malpighian vessels ; and one joins a suspensorium which 

 extends from a large trachea in the third abdominal segment 

 to the intestine. 



Trace out the course of the branches of the branched suspen- 

 sory muscle, and make a provisional sketch showing their con- 

 nections. 



