F. A. POTTS 



PLATE 3 









Pits of Cryptochirus coralliodytes in a colony of Leptoria tenuis from Minikoi. About natural size. 

 From a photograph of a specimen now in the Cambridge University Museum of Zoology. 

 Three deep pits formed by females are seen on a diagonal line across the figure. They may be 

 distinguished by their circular shape (and straight sides) from pits formed by commensal 

 lamellibranchs, one of which is seen to the right (oval in shape). Just above the central 

 pit is another shallow depression which was occupied by a male. 



