PLATE XIV 



Fig. 1—4. Balanus tintinnabulum (Linn.) var. validus 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. 



b. 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, i2 ; , 13, 14, 15, and 17: var. malayensis n. var. 

 Animal, lateral view; magnified 4 diameters. 

 Same specimen, seen from below ; magnified 4 diameters. 



a. scutum, internal view; magnified 10 diameters. 



b. tergum, internal view; magnified 10 diameters. 



c. scutum, external view; magnified 10 diameters. 



d. tergum, external view; magnified 10 diameters. 

 Fig. 11. Transverse sections of lateral compartment; magnified 20 diameters. 



a. about the middle of the height. 



b. near the upper extremity. 

 Fig. 12*. 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 6"i pair; magnified 206,5 diameters. 



I" ig. 12, [4* and 16: var. communis 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 4U1 and $th segments of cirrus of third pair; magnified 206,5 diameters. 



