PLATE II. 



Figs. 1-4. Ascopera gigantea, Herdman. 

 Fig. 5. Ascopera pedunculata, Herdman. 



Fig. 1. Part of the branchial sac of Ascopera gigantea, between two folds, seen from the 

 inner side, magnified, showing a. transverse vessel (tr.), two internal longi- 

 tudinal bars (i.l.), and the stigmatic network between (Hartn., obj. 4). 



Fig. 1. A small portion of the last figure, greatly magnified, to show the ciliated cells 

 (sg.c.) lining the stigmata (Hartn., obj. 7). 



Fig. :>. Squamous epithelial cells from the surface of a transverse vessel: much magnified 

 (Hartn., obj. 10). 



Fig. 4. Part of a- section through the test of Ascopera gigantea, showing the stellate 

 cells and small bladder cells ; magnified (Hartn., obj. 5). 



Fig. 5. Part of the branchial sae of Ascopera peduncidata, seen from the inside; magnified 

 (Hartn.. obj. 6). 



