216 



-t 



— V — cr. 



-a.b V. 

 -p ho. 



Fig. 79 — Teredo navalis L. 



Photomicrographs of cross-sections of a small male specimen, anterior aspect. These four figures 

 correspond, respectively to figures 77, 2-5. Since the photomicrographs are of a smaller animal than 

 that represented by the diagrams, the acini of the liver and the lobules of the gonad are relatively 

 larger in the former. Magnification 25 diameters. 



The specimen from which these sections were made was taken from a pile at Crockett, San 

 Francisco Bay, on July 6, 1922. It was fixed in Gilson's fluid, imbedded in paraffin, the sections cut 

 10 microns thick, and stained in Delafield's haematoxylin. 



