PLATE XV. 



Figs. 1-4. Cynthia hispida, Herdman. 

 Figs. 5-7. Cynthia cerebriformis, Herdman. 

 Figs. 8-11. Oynthia flasa, Herdman, 



Fig. 1. Cynthia hispida, a specimen from the left side ; natural size. 



Fig. 2. A part of the branchial sac, seen from the inside, showing a fold (br.f.) ; magnified 



(Hartn., obj. 4). 

 Fig. 3. Part of the dorsal lamina, showing the two series of languets (I. and //) ; magnified 



(Hartn., obj. 4). 

 Fig. 4. The dorsal tubercle ; natural size and enlarged. 

 Fig. 5. Cynthia cerebriformis, a specimen from the right side ; natural size. 

 Fig. 6. A part of the branchial sac, seen from the inside, showing a fold (br.f.) ; magnified 



(Hartn., obj. 4). 

 Fig. 7. The dorsal tubercle and part of the peritubercular area, &c. ; magnified (Hartn., 



obj. 4). 

 Fig. 8. Cynthia fissa, from the right side ; natural size. 

 Fig. 9. Part of the branchial sac of Cynthia fissa ; seen from the inside, and showing a 



fold ; magnified (Hartn., obj. 4). 

 Fig. 10. The dorsal tubercle and the peritubercular area of Cynthia fissa; magnified 



(Hartn., obj. 4). 

 Fig. 11. One of the tentacles of Cynthia fissa, showing the short papilla-like pinnae; 



magnified (Hartn., obj. 4). 



