PLATE III. 



Figs. 1 and 2. Ascopera pedunculata, Herdman. 

 Figs. 3-5. Ascopera gigantea, Herdman. 



Fig. 1. Ascopera 'pedunculata, from the left side ; three-fourths of the natural size. 



Fig. 2. The dorsal tubercle of Ascopera pedunculata ; enlarged. 



Fig. 3. Part of the branchial sac of Ascopera gigantea, seen from the interior; enlarged, 



showing a branchial fold (br.f.) and part of the intermediate area (mh.). 

 Fig. 4. Part of tin 1 branchial sac of Ascopera gigantea, between two internal longitudinal 



liars, to show an unusually simple and regular arrangement of the stigmata; 



magnified (Hartn., obj. 4). 

 Fig. 5. The dorsal region of the anterior end of the branchial sac of Ascopera gigantea, 



showing the dorsal tubercle, part of the tentacular circlet, the branchial folds, 



dorsal lamina, &c ; natural size. 



