PLATE 1. 



] lo ■'. . Teredo Norva^ica .valves and pallets . 

 .7. Ditto, tube esMbiting • acameral : I b u ture and hinder aperture . 

 6. T i itara 7. T.navalis y,\\ lets 

 ,i i i (ken to in iw m - simple structure . 



bipennata. 12.13.14. T.malleolus 



184-8. 



