186 Proceedings of the Royal Irish Academy. 



EXrLA:s'ATi(.>N OF I'LATES. 



I'UVIK XIX. 



From a photogiapli of two liisli speciiiioiis ol' CvraiUmorpkus riij'uhui, 

 viewed from above, ami somewhat reduced. I'lioto, F. Culliford, 

 Aberystwytli. 



I'JATK XX. 



Aiiat«>iiiy of CurailiiiiorjihiUi rU/idits. 



Fij;. 1. T.8. of a mesenterial tilamciit. Oc. .">. Ulij. i;. 



Fig. 2. Part of a T.S. of a mesentery, sliowing that portion of il wliitli is 

 adjiuient to llio Wdy-wall. Uc. o. Ul'j. l.^. 



Fig. 3. Nematoi-y.st frtmi ectoderm of Imdy-wall. Oe. '■',. Ul>j. -,^ oil imm. 



Fig. 4. T.S. of llie mesogltHM nf ili.' jmiI nf a nu\-<entery adjaecni. In the 

 botiy-wall. Oe. M. Uhj. U. 



Fig. 5. Vertiuii section ]>ai>sing thron^h the ecloderin and part of the 

 mesogloea of the oral disc, and sliowing tlic ectodermal muscidatiire. Oc. '6. 

 Obj. •• 



