BY WILLIAM A. HASWELL, M.A., B.SC, 297 



Fig. 12. — Section of the lower end of the gizzard of the same. 



,, 13. — A portion of the mucous lining of the same, more 

 highly magnified ( x 200). 



Plate VIII. 



Fig. 1 . — Portion of section through the anterior region of the 

 body of Triceratia arceoceras, magnified, a, nerve 

 cord ; h, ventral longitudinal muscles ; c, neuro- 

 podium ; e, dorsal longitudinal muscle ; /, gizzard ; 

 g, necks of anterior gastric caeca surrounded by the 

 generative products. 



,, 2. — Section of the posterior region of the body of the same, 

 magnified ; a, nerve-cord ; i, ventral longitudinal 

 muscles ; c, neuropodium ; d, notopodium ; e, dorsal 

 longitudinal muscles ; /, intestine ; g, g, cseca. 



,, 3. — Head and anterior portion of the body of Lepidonotus 

 Ussolepis, from above, magnified, 



,, 4. — Ventral seta of the same X 200. 



,, 5. — Ventral seta of Thormora argus. 



,, 6. — The same, lateral view ; 6», another form of the same. 



,, 7. — Portion of dorsal seta of the same, X 375. 



,, 8. — One of the larger processes on the surface of the elytra 



of the same, x 200. 

 ,, 9. — Head of variety of Thormora argus. from Victoria, from 



above, magnified. 



,, 10. — Ventral seta of the same, X 200. 



,, 11. — Dorsal seta of the same, x 200. 



,, 12. — Head and anterior portion of the body of the Port 

 Jackson form of Thormora argus, from above 

 magnified. 



,, 13. — Head and anterior portion of the body of Lepidonotus 

 melanogrammus, from above, magnified. 



