PLATE XXIII 



Fig. i — 3. Balanus navicula Darwin. 



Fig. 1. a and b, scutum and tergum, internal view; magnified 42,5 diameters. 

 c and d, scutum and tergum, external view; magnified 42,5 diameters. 

 Fig. 2. Labrum, with right-hand palpus ; magnified 144 diameters. 

 Fig. 3. Maxilla; magnified 144 diameters. 



Fig. 4 — 11. Balanus investitus n. sp. 



Fig. 4. Animal seen from above, attached to an AcantJiogorgia, which also covers the Balanus; 

 magnified 9 diameters. 

 Shell, lateral view; magnified 9 diameters. 



a and b, scutum and tergum, internal view; magnified 10 diameters. 

 c and d, scutum and tergum, external view; magnified 10 diameters. 

 Labrum, with right-hand palpus; magnified 144 diameters. 

 Mandible; magnified 144 diameters. 

 Maxilla; magnified 144 diameters. 

 Outer maxillae ; magnified 144 diameters. 

 Sixth cirrus, one of the middle segments; magnified 64 diameters. 



Fig. 12 — 16. Balanus comutiis n. sp. 



Fig. 12. Shell seen from above; magnified 8 diameters. 

 Fig. 13. Shell, lateral view; magnified 8 diameters. 



Fig. 14. a and b, scutum and tergum, internal view; magnified 10 diameters. 

 c and d, scutum and tergum, external view; magnified 10 diameters. 

 Fig. 15. Third cirrus, longer ramus, 4'h segment; magnified 206,5 diameters. 

 Fig. 16. Sixth cirrus, eigth segment; magnified 64 diameters. 



Fig. 17 — 21. Balanus proripiens n. sp. 



Fig. 17. Animal, lateral view; magnified 4 diameters. 



Fig. 18. a and b, scutum and tergum, internal view; magnified 10 diameters. 

 c and d, scutum and tergum, external view; magnified 10 diameters. 

 Fig. 19. Labrum, with right-hand palpus; magnified 64 diameters. 

 Fig. 20. Mandible; magnified 64 diameters. 

 Fig. 21. Maxilla; magnified 64 diameters. 

 Fig. 21 . Edge of the maxilla, with spines; magnified 206,5 diameters. 



