380 



AKTICULATA: WORMS. 



The Gephyrea are cylindrical in outline, and covered 

 mainly by a soft integument ; though chitinous matter is 



FIG. 514. 



Gephyrean, Phascolosoma Gouldii. 



secreted in some cases. The Sipunculoids and Synaptidae, 

 formerly classed with the Holothurioids, are representatives 

 of this group. 



SUB-SECTION VI. 



THE ORDER OF DISCOPHORA OR SUCTORIA OR LEECHES. 



THE Leeches are provided with a sucking disk at each 

 extremity. The name Discophora is from the Gr. diskos, 

 a disk, andphero, to bear. 



They perform locomotion either by means of these 

 disks, or by swimming. They are found in both fresh 

 and salt water, and are popularly known as Blood- 



Fig- 515. 



Leech, Sanguisuga officinalis. 



suckers. A s'pecies found in Ceylon is wholly terrestrial! 

 The mouth of the Leech is situated in the anterior 



