IX PRACTICAL DIRECTIONS 465 



which all the unpaired soft organs are left intact. Without tearing 

 the mesentery, pin out the liver, stomach, and intestine beyond the 

 ventral limits of the body-wall, so that the other abdominal organs are 

 not hidden. Follow out the relations of the various organs as before, 

 and sketch your dissection. 



It is important at this stage to refresh your memory of the anatomy 

 of the Frogi and to compare it with the Dogfish, by making a dis- 

 section from the side as directed above (compare Fig. 7). Sketch. 



Pract. Zool. „ „ 



