82 LABORATORY DIRECTIONS 



3. The pyloric cecuni is the conspicuous two branched 

 structure occupying most of the space within each ray. This 

 organ produces digestive fluids. At its inner end each cecum 

 is attached to the pyloric chamber of the stomach. 



4. Pyloric sac or stomach. Shape? Position? How at- 

 tached to body wall ? How many and what openings from it ? 

 Into it? 



(Extensor muscles of rays. Situated in the center of the 

 lower face of aboral wall of eacji ray. What movement can be 

 produced by their contraction?) 



5. Cardiac division of the stomach. Remove the ceca from 

 two adjacent rays and under the corner of the pyloric sac note 

 one of the five cardiac pouches, the union of which makes the car- 

 diac stomach. 



6. Stomach retractor muscles. There are two to each pouch. 

 Attachments? What effect would their contraction have? Notes 

 required. 



7. Esophagus. Cut two of the stomach retractors and raise 

 up the pouches so as to expose the esophagus. 



8. Peristome or membrane around the mouth. Expose 

 from inside. 



9. Make a careful drawing showing the digestive system 

 from aboral surface. 



10. Study the chart and your specimen to make out the 

 relations of these organs in side view. 



REPRODUCTIVE SYSTEM % f 



The sexes are distinct. Have the reproductive glands pointed 

 out to you. Number in each ray? Position? Form? Examine 

 with a lens. Their ducts may be traced into the inter-radial par- 

 titions whence they pass up to the openings on the upper surface 

 of the rays. Their external openings are very difficult to dem- 

 onstrate. 



