190 



ANNUL AT A. 

 ARENICOLA. 



III.— HIRUDO. 



Phylum - 



Sub-Phylum 



Class 



Fig. 



Annulata (p. 237). 

 Annelida (p. 238). 



HiRUDINEA (p. 239). 



116. — The Medicinal Leech 

 ( Hirudo medicinalis). 



The more tapering end is anterior. The centre'.individual 

 is seen in the action of swimming. 



