AN ICHTHYOBDELLID PARASITIC ON SAND WHITING. 9 
the annulation of the 'posteriof part of the leech is very indis- 
tinct, *so that in specimens in which the annulation of the neck 
Text-fig. 2. 
Diagram showing the character of the annulation of the 
preclitellar and elitellar regions of Austrobdella trans- 
lucens and the relations of the nerve ganglia, proboscis, and 
sexual organs. S. gn. Subcesophageal nerve ganglion. N. gn. 
Nerve ganglion. P. Proboscis. Ej. t. Terminal part of 
ejaculatory canal. Sp. gl. Spermatophore glands. Male 
opening. $ Female opening. Roman numerals indicate 
primitive annuli, ordinary numerals the subdivision of the 
primitive annuli. 
and jlnid- body can be seen, that of this posterior part of the 
body is pot evident. 
