PLATE XIX. 



Figs. I and 2. Styela grandis, Herdman. 

 Figs. 3 and 4. Styda convexa, Herdman. 

 Figs. 5 and G. Styda exigua, Herdman. 

 Figs. 7 uud S. Styela lactea, Herdman. 

 Figs 9 and 10. Styela clava, Herdman. 



Fig. 1. Styela grandis, a specimen seen from the left side ; natural size. 



Fig. 2. Part of the branchial sac of Styela grandis, seen from the inside ; magnified 



(Hartn., obj. 4). 

 Fig. 3. Styela convexa, seen from the left side ; natural size. 

 Fig. 4. Part of the branchial sac of Styela convexa, seen from the inside; magnified 



(Hartn., obj. 4). 

 Fig. 5. Styela exigua, from the right side ; natural size. 

 Fig. 6. Part of the branchial sac of Styela exigua, showing a fold (br.f.), seen from the 



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

 Fig. 7. Styela lactea, a specimen from the right side ; natural size. 

 Fig. 8. Part of the branchial sac of Styela lactea, seen from the inside ; magnified 



(Hartn., obj. 4). 

 Fig. 9. Two specimens of Styela clava ; natural size. 

 Fig. 10. Part of the branchial sac of Styela clava, seen from the inside ; magnified 



(Hartn., obj. 4). 



