PLATE XXVI. 



Corella japonica, Herdman. 

 Fig. 1. Corella japonica, from the left side ; natural size. 

 Fig. 2. The same, with the test removed, seen from the left side, showing the musculature 



of the mantle ; natural size. 

 Fig. 3. The same, from the right side, showing the alimentary canal, &c. ; natural size. 

 Fig. 4. Part of the branchial sac, seeu from the interior ; magnified (Hartn., obj. 4). 

 Fig. 5. A small portion of the branchial sac, seen from the outside ; much magnified 



(Hartn., obj. 5). 

 Fig. 6. Part of the musculature of the mantle ; magnified (Hartn., obj. 4). 

 Fig. 7. Part of the dorsal lamina showing the languets (I.) ; enlarged. 

 Fig. 8. The condition of the internal longitudinal bars in some parts of the branchial sac ; 



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

 Fig. 9. The dorsal part of the anterior end of the branchial sac, showing the dorsal tubercle 



(d.t.) and the tentacles (tn.) ; magnified (Hartn., obj. 4). 



