EXPLANATION OF THE LETTERING OF THE PLATES. 



Corona . 



Lobe of do. 



Styligerous prominence 



Chin 



Ciliateii cuj) . 



Hook 



Horny processes 



Foot 



Toe ... 



Ciliary wreath 



Prmcipal WTeath 



Secondary wreath . 



Taster . 



Vestibule 



Buccal fimnel . 



Lips 



Tube from lips to crop 



Crop 



Mastas . 



\ Parts of head and body. 



Trophi 



or 

 Jaws 



malleus 



( 



manubriimi 

 uncus 

 ramiis 

 fulcnun 



-Nutritive system. 



ffisophagus 



Stomach . 



Intestine 



Eectiun . 



Cloaca 



Salivary gland 



Gastric gland . 



Foot gland 



Lateral canal . 



Vibratile tag . 



Contractile vesicle . 



Ovary 



Genu 



Oviun 



0%'iduet . 



Penis 



Siierm-sac 



Longitudinal muscle 



Transverse muscle . 



Ganglion 



Eye ... 



Dorsal antenna 



Lateral antenna 



TactUe stylo . 



Nerve thread . 



Secreting system. 



-Vascular system. 



-Reproductive system. 



• Muscular svstom. 



Nervous system. 



