78 MORPHOLOGY OF INVERTEBRATE TYPES 



excretory canals, genital papilla with the atrium and all parts of 

 the reproductive system except the efferent canals and the 

 oviduct. Make a half page drawing and label all parts. 



2. Examine under dissecting microscope the prepared slide of 

 a proglottis with a fully developed uterus. Count its lateral 

 branches on each side. Make a half page drawing showing the 

 outline of the proglottis and the uterus. 



3. Examine under low power a cross-section through a pro- 

 glottis. Make a half page drawing and label the cuticle, sub- 

 cuticular cells, longitudinal, dorso-ventral and transverse mus- 

 cles, testes and uterus, longitudinal excretory canals and the 

 lateral longitudinal nerves. 



4. Examine a prepared slide of a scolex of Dipylidium cani- 

 num (a common tapeworm of dogs and cats). Unlike the scolex 

 of T. saginata it has a well developed rostellum with hooks. 

 Make a drawing showing rostellum, hooks, suckers, and neck. 



