PLATE XIV 
Fig. 1—4. Balanus tintinnabulum (Linn.) var. valédus Darwin. 
Fig. 1. Cirrus of first pair; magnified 14 diameters. 
Fig. 2. Cirrus of second pair; magnified 14 diameters. 
Fig. 3. Cirrus of third pair. a. Membranous plate fringed with fine bristles; magnified 14 diameters. 
Fig. 4. Segments 12 and 13 of the cirrus of the sixth pair; magnified 30 diameters. 
Fig. 5—6. Balanus tintinnabulum (Linn.) var. costatus n. var. 
Fig. 5. Animal seen from above; magnified 4,1 diameters. 
Fig. 6. a. tergum, internal view; magnified 8 diameters. 
6. scutum, internal view; magnified 8 diameters. 
c. scutum, external view; magnified 8 diameters. 
d. tergum, external view; magnified 8 diameters. 
Fig. 7. Balanus tintinnabulum (Linn.) var. plicatus n. var. 
Fig. 7. Animal seen from above, with smaller specimen attached to it; magnified 4,1 diameters. 
Fig. 8—17. Balanus amphitrite Darwin. 
Fig. 8—11, 12*, 13, 14, 15, and 17: var. malayensis n. var. 
Fig. 8. Animal, lateral view; magnified 4 diameters. 
Fig. 9. Same specimen, seen from below; magnified 4 diameters. 
Fig. 10. a@. scutum, internal view; magnified 10 diameters. 
6. tergum, internal view; magnified 10 diameters. 
c. scutum, external view; magnified 10 diameters. 
d. tergum, external view; magnified 10 diameters. 
Fig. rr. Transverse sections of lateral compartment; magnified 20 diameters. 
a. about the middle of the height. 
6. near the upper extremity. 
Fig. 1r2*. Right-hand palpus, external view; magnified 64 diameters. 
Fig. 13. Mandible; magnified 64 diameters. ; 
Fig. 14. Maxilla, with 7 spines between upper and lower pair; magnified 64 diameters. 
Fig. 15. Outer maxillae; magnified 44,5 diameters. 
Fig. 17. Inner face of middle segment of cirrus of 6th pair; magnified 206,5 diameters. 
Fig. 12, 14*, and 16: var. communzs Darwin. 
Fig. 12. Labrum, external view; magnified 140 diameters. 
Fig. 14%. Maxilla, with 5 spines between upper and lower pair; magnified 140 diameters. 
Fig. 16. Inner face of 4th and 5th segments of cirrus of third pair; magnified 206,5 diameters. 
