290 ARTHUR E. SHIPLEY. 



Fig. 2. — A transverse section tlirough about the centre of the body of 

 Sondes mus echinorum. 



Fig. 3. — A -longitudinal horizontal section through Syndesnius ecliino- 

 rum. Tiiis section is cut in a somewhat oblique |)laiie, tiie anterior end being 

 nearer the dorsal surface, the posterior nearer the ventral surface. 



Fig. 4. — A sketch of a stained and mounted si)ecimen of Syndesmus 

 echinorum. The parts shown can be identified by a reference to Fig. 5. 



Fig. 5. — A diagram to explain the anatomy of Syndesmus ecliinorum. 



Fig. 6. — A small portion of tlie epidermis and intestinal wall of Syn- 

 desmus ecliinorum, very highly magnified to show the nature of the 

 Plasmodium lining the alimentary canal. 



YiG. 7. — A transverse section of Syndesmus echinorum through the 

 region of the mouth and pharynx. To the left the anterior loop of the vas 

 deferens is shown. 



Fig. 8. — Large nematode extracted from the ccelom of Echinus escu- 

 lentus. X ]. 



