732 AUSTRALIAN HIRUDINEA, IV. 



EXPLANATION OF PLATES LVI -LVIIL 



Plate Ivi. — Pontohdella macrothela Schmarda. 



Fig.L — Ventral view. 

 Fig. 2. — Dorsal view. 



Plate W\\. — Pontohdella australiensis, n.sp. 



Fig.L — The body distended. 

 Fig. 2. — The body extended. 



Plate Wni.—Geohdella tristriata, n.sp, 



Fig.L — Dorsal view. 

 Fig. 2. — Ventral view. 



