254 



RICHARD E. SCAMMON 



No particular degree of differentiation seems necessary before 

 a 'tubule takes part in an anastomosis, and when this process 

 begins in any region both branched and simple tubules fuse 

 indifferently. The commonest form of anastomosis is that 

 established by the end to end fusion of tubules, but tubules may 



Fig. 2 Sagittal section of the anastomosing tubules of the left hepatic pouch 

 of an Acanthias embryo 14 mm. long (S.C. 30.) X 100. 



also join end to side or side to side. The last type is much com- 

 moner in later stages when more opportunities are offered for this 

 form of contact. Anastomoses also seem to take place with 

 equal frequency between tubules formerly quite separate or 

 between minor branches of the same tubule when it is possible 

 for such branches to come in contact. 



