118 Proceedings of the Royal Society of Victoria. 



Plate VIII. 



Fig. 6. — Median longitudinal vertical section through the 

 anterior end, from the same series and drawn 

 to the same scale as Figures 2-5. 



h. m. Basement membrane. 



c. gl. Cephalic gland. 



c. m. layer of circular muscles. 



e. 0. Common opening of mouth and proboscis 



sheatli (= opening of rhynchod?eum). 

 cl. c. Dorsal commissure o± brain. 



d. gl. Dorsal glandular organs. 



d. gut. Forward diverticulum of the gut, passing 



beneath the oesophagus. 

 ep.'p.s. Epithelium lining proboscis sheath. 

 gut. Gut ]M'oper. 

 m. Mouth. 



m. jj. Ruptured muscular attachment of the proboscis 

 to the anterior end of the proboscis sheath. 

 oes. 1. First, narrow portion of oesophagus. 

 oes. 2. Median, dilated poition ot oesophagus. 

 oes. 3. Last, narrow portion ot oesophagus. 

 V. c. Ventral commissure of brain. 

 (Other lettering as before). 

 Fig. 7.— Transverse section of a specimen stained with 

 hteraatoxylin, taken just behind the cerebral 

 commissures, to show especially the cephalic 

 gland. Drawn under Zeiss A, oe. 3, camera 

 outline. The proboscis being everted the non- 

 eversible portion is seen in section inside the 

 proboscis sheath. 

 ex. t. Excretory tubules. 

 p. Proboscis. 



(Other lettering as before). 



Fig. 8. — Transverse section near the middle of the body. 

 From the same series as Fig. 7. The inequality 

 in thickness of the proboscis sheath is due to 

 irregular contraction. The ovaries happen to be 

 very small in this section. Drawn under 

 Zeiss A, oc. 2, camera outline. 

 I. V. Lateral vessel. 

 ov. Ovary. 



(Other lettering as before). 



