PLATE XXIV. 



Figs. 1 and 2. Polycarpa pedata, Herdman. 

 Figs. 3-5. Polycarpa radicata, Herdman. 

 Figs. 6 and 7. Styela radicosa, n. sp. 

 Figs. 8-12. Bathyoncus mirdbilis, n. sp. 



Fig. 1. Polycarpa pedata, from the right side ; natural size. 



Fig. 2. Part of the branchial sac of Polycarpa pedata, seen from the inside ; magnified 



(Hartn., obj. 4). 

 Fig. 3. Polycarpa radicata, a specimen seen from the right side ; natural size. 

 Fit;. 4. Another specimen of the same species, from the left side ; natural size. 

 Fig. 5. Part of the branchial sac of Polycarpa radicata, showing a fold (br.f.), seen 



from the inside ; magnified (Hartn., obj. 4). 

 Fig. 6. Styela radicosa, from the right side ; natural size. 

 Fig. 7. Part of the branchial sac of Styela radicosa, seen from the inside ; magnified 



(Hartn., obj. 4). 



Fig. 8. Bathyoncus mirdbilis, from the left side ; natural size. 



Fig. 9. Part of the branchial sac of Bathyoncus mirdbilis, showing two of the simple folds 



(br.f.), seen from the inside; magnified (Hartn., obj. 4). 

 Fig. 10. Part of the circle of tentacles of Bathyoncus mirdbilis ; magnified (Hartn., obj. 5). 

 Fig. 11. The dorsal tubercle (d.t.), and peritubercular area of Bathyoncus mirdbilis; 



magnified (Hartn., obj. 4). 

 Fig. 12. Part of the wall of the cloaca in Bathyoncus mirdbilis, seen from the inside, and 



showing the terminations of the oviduct (o.d.) and vas deferens (v.d.), and 



part of tin 1 two circles of atrial tentacles (at.t.) ; magnified (Hartn., obj. 5). 



