1897.] 



MR. E. T. BROWXE ON BRITISH MEDTTS.^i:. 



827 



Fig. 10. 



Dipleurosoma ke7nisph<sriciim. 



Diagram of the radial canal-system. Oral ^iew. 



ff, gonad ; m, mouth expanded ; r.c, ring-canal ; .s, stomach ; v, veliiiii. 



Dvpletirosoma hemis2jhmricum. 



Diagram showing the radial canals leaving the stomach. Oral \ iew. 

 The canals marked with an arrow enter the ring-canal. 



55* 



