EXPLANATION OF PLATES. 



Plate 1. 

 Teredo navalis Linnaeus, after Meyer and Mobius. 



Fig. 1. In its wood burrow. 

 2, 3. Siphons and pallets. 

 13. Exterior right valve. 



7. Interior left valve. 



6, 12. Dental ridges of the anterior part. 



4, 5, 9, 10, 11. "Views of the denticles of the anterior median portion. 



8. Pallets. 



Plate 2. 



Bankia (Bankiella) gouldi Bartsch. 



(Copy of Sigerfoos's Plate 8.) 



Fig. 5. Showing exterior of the animal. 



6. With the mantle removed, showing internal organization. 



KEY TO LETTERING. 



aa, Anterior adductor muscle. 



op, Posterior adductor muscle. 



apa, Adductor muscle of pallet. 



hg, Branchial groove. 



ch, Cephalic hood of mantle. 



col, Collar. 



epc, Epibranchial cavity. 



es, Exhalent or anal siphon. 



f, Foot. 



(J, Ctenidium or gill. 



is, Inhalent or respiratory siphon. 



lig. Shell ligament. 



mc. Mantle cavity. 



pa, Pallet. 



pp. Protractor muscle of pallet. 



rs, Attachments of the siphons. 



sh, Shell. 



vm, Visceral mass. 



Plate 3. 



Detail of the siphon and pallet apparatus of Banlcia (Bankiella) gouldi Bartsch. 

 Figs. 35 and 36 from Sigerfoos. 



Lettering as in Plate 2 with the following additions : ca, calcareous lining of 

 burrow ; rp, retractor muscle of pallet. 



Plate 4. 



Bankia (Bankia) setacea Tryon. 



Plate .5. 

 A number of animals of Bankia (Banlcia) setacea Tryon. 



(Used by permission of the San Francisco Bay Marine Piling Committee.) 



Plate 6. 



Bankia (Neobankia) zeteki Bartsch. 

 93044—22 4 45 



