I \) 



LIST OF PLATES 



1. Centrolophus nigcr, Gmelin. 



II. Philodina brevipes, n.sp. ; Philodina acuticornis, n.sp. ; Philodina 

 decurvicornis, n.sp. ; Philodina obesa, n.sp. 



III. Philodina hexodonta, Bergendal ; Callidina ornata, n.sp. ; 

 Rotifer quadrioculatiis, n.sp. ; Rotifer spicatus, n.sp. 



IV. Raia circularis, R. radula, R. radiata. 

 V. Spinulation, etc., of R. circularis and R. radula. 



