PLATE XVII | 
Fig. 1. Balanus tenuis Hoek. 
Bigae an 
Outer maxillae; magnified 64 diameters. | 
Fig. 2—12. Balanus soctalis Hoek. 
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Two specimens attached to a piece of shell; magnified 10 diameters. 
a and 4, scutum and tergum, internal view; magnified 10 diameters. 
c and d, scutum and tergum, external view; magnified 10 diameters. 
a and 6, two sections through the walls: a, near the orifice and 4, near the basis; 
magnified 15 diameters. 
Labrum, with right-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. 
Sixth cirrus, two of the middle segments; magnified 64 diameters. 
Specimen with swollen compartments and elongated carina; magnified 10 diameters. 
Specimen with very broad alae; magnified 10 diameters. 
Tergum of the specimen with very broad alae: a, internal, 6, external view; magnified 
10 diameters. 
. Balanus maldivensis Borradaile. 
. 13. Specimen attached to the spine of an Echinid; magnified 10 diameters. 
. 14. @ and 4, scutum and tergum, internal view; magnified ro diameters. 
c and d, scutum and tergum, external view; magnified 10 diameters. 
15. Labrum, with left-hand palpus; magnified 144 diameters. 
16. Mandible; magnified 144 diameters. 
17. Maxilla; magnified 144 diameters. 
18. Outer maxillae; magnified 64 diameters. 
Ig. Sixth cirrus, last segment but 7th; magnified 64 diameters. 
. Balanus auricoma n. sp. 
. 20. Group of specimens attached to a stone; magnified 10 “diameters. 
. 21. Horizontal section through the valve near the basis; magnified 14 diameters. 
. 22. a and 4, scutum and tergum, internal view; magnified 8,2 diameters. 
c and d, scutum and tergum, external view; magnified 8,2 diameters. 
