p. ad. 



it. d.f. ocs. nt. d.a. a. ad. 



I ! I I I 



I I I 1 I 

 I 



1. Anterior end of Teredo navalis in sagittal section. Camera, x 25. a. ad., anterior adductor muscle; 

 a.st., anterior part of stomach; c.f,, central disc of the foot; est., crystalline style; d.a., pocket of the 

 dorsal articulation of the shell; d.f., dorsal fold of the mantle; i.m., i.m.' , inner free fold of the mantle; 

 int., intestine;/.,/.', /.", livers; m., mouth; m. c, mantle ca\ity; oes., oesophagus; p. ad., posterior adductor 

 muscle; p. c, pericardial cavity; p.f., peripheral area of the foot; p. g., pedal ganglion; r. /., r. f.' , retractor 

 muscles of the foot; s. m., secreting border of the mantle; v. a., pocket of ventral articulation of the shell. 



2. Detail of epithelium of the central disc of the foot. Camera, x 750. 



3. Detail of epithelium of the periphery of the foot. Camera, x 750. 



4. Detail of cross-section through anterior termination of mantle (i.m., s.tn., fig. 1). Inner, free 

 fold (left), and outer secreting fold (right), showing insertion of periostracum. Camera, x 175. 



