PLATE XXII 
Fig. 1—2. Balanus quadrivittatus Darwin. 
Fig. 1. Fourth cirrus, pedicel and lower segments; magnified 64 diameters. 
Fig. 2. Sixth cirrus, one of the middle segments; magnified 64 diameters. 
Fig. 3—10. Balanus quinquevittatus n. sp. 
Fig. 3. Shell attached to shell of Gastropodous mollusc ; magnified 4 diameters. 
Fig. 4. a@ and 4, scutum and tergum, internal view; magnified 7,6 diameters. 
c and d, scutum and tergum, external view; magnified 7,6 diameters. 
Labrum, with left-hand palpus; magnified 64 diameters. 
Mandible; magnified 64 diameters. 
Maxilla; magnified 64 diameters. 
Edge of maxilla, with spines; magnified 206,5 diameters. 
Outer maxillae; magnified 64 diameters. 
Fig. g. Fourth cirrus, pedicel and lower segments; magnified 144 diameters. 
Fig. 10. Sixth cirrus, one of the middle segments; magnified 144 diameters. 
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Fig. 11—18. Balanus hystrix n. sp. 
Fig. 11. Shell, side-view; magnified 7,5 diameters. 
Fig. 12. @ and 4, scutum and tergum, internal view; magnified 10 diameters. 
c and d, scutum and tergum, external view; magnified 10 diameters. 
Fig. 13. Labrum, with left-hand palpus; magnified 144 diameters. 
Fig. 14. Mandible; magnified 144 diameters. 
Fig. 15. Maxilla, edge with spines; magnified 144 diameters. 
Fig. 16. Third cirrus, 5th segment; magnified 206,5 diameters. 
Fig. 17. Fifth cirrus, 5th segment; magnified 206,5 diameters. 
Fig. 18. Sixth cirrus, roth segment; magnified 206,5 diameters. 
Fig. 19—25. Balanus calceolus Ellis. 
Fig. 19. . Shell, side-view; magnified 4,5 diameters. 
Fig. 20. a@ and 6, scutum and tergum, internal view. 
c and d, scutum and tergum, external view. 
Fig. 21. Labrum, with right-hand palpus; magnified 44,5 diameters. 
Fig. 22. Mandible; magnified 44,5 diameters. 
Fig. 23. Maxilla; magnified 44,5 diameters. 
Fig. 23*. Edge of maxilla, with spines; magnified 144 diameters. 
Fig. 24. Outer maxillae; magnified 44,5 diameters. 
Fig. 25. Sixth cirrus, one of the middle segments; magnified 64 diameters. 
Fig. 26. Balanus navicula Darwin. 
Fig. 26. a and 6, Shell, seen from right and left side; magnified 7,5 diameters. 
