EXPLANATION OF PLATES. 131 



Fig. 8. Part of branchial sac from outside, to show papillae. S. 1. 

 Fig. 9. Part of dor-sal lamina. S. 1. 

 Fig. 10. Dorsal tubercle. S. 1. 



PLATE CYN. XVII. 



Fig. 1. Polycarpa steplienensis, n. sp., from left side, nat. size. 



Fig. 2. Part of branchial sac. S. 1. 



Fig. 3. Dorsal tubercle and tentacles, slightly enlarged. 



Fig. 4. Alimentary canal and polycarps of left side, nat. size. 



Fig. 5. Polycarps of right side of mantle, nat. size. 



Fig. 6. Polycarpa Sluiteri, n. sp. (see PI. Cyn. IV., tig. 1, P 1 -), part of 



branchial sac. S. 1. 



Fig. 7. The dorsal tubercle. 



Fig. 8. Some of the tentacles. 



Fig. 9. Polycarps from the mantle. S. . 



PLATE CYN. XVIII. 



Fig. 1. Three specimens of Polycarpa viridis, Herdm., attached to a 

 specimen of P. rigida, Herdm., nat size. 



Fig. 2. Dorsal tubercle of Polycarpa ri/jida. S. 1. 



Fig. 3. Another specimen of same. S. 1. 



Fig. 4. Part of branchial sac and dorsal lamina of P. riyida. S. 1. 



Fig. 5. Stalked sandy specimen of P. viridis, nat. size. 



Fig. 6. Dorsal tubercle of P. viridis. S. 1. 



Fig. 7. Another sand-encrusted /*. viridis, nat. size. 



Fig. 8. Small part of branchial sac, highly magnified, to show out- 

 growths from vessels and vesicular structure of bar. S. -. 



Fig. 9. Tentacles of P. viridis. S. 1. 



Fig. 10. Atrial tentacles. S. 1. 



PLATE CYN. XIX. 



\ 



Fig. 1. Polijcarpa sacciformis, n. sp., left side, nat size. 



Fig. 2. Part of branchial sac. S. 1. 



Fig. 3. Dorsal tubercle. S. 1. 



Fig. 4. Part of tentacular circlet, enlarged with lens. 



Fig. 5. Polycarpa longisiplwuica, Herdm., nat. size. 



Fig. 6. Dorsal tubercle. S. 1. 



Fig. 7. Polycarpa Jacksoniana, n. sp., right side, nat. size. 



Fig. 8. Dorsal tubercle. S. 1. 



Fig. 9. Part of branchial sac. S. 1. 



