PLATE VII. 



Page 

 Fig. 1. PAGURTJS BERNHARDUS 359 



Fig. 2. PAL^MON SERRATTJS 365 



Fig. 3. MAIA SQULNTADO 382 



The smaller figures exhibit its larva condi- 

 tion (not specially described in the text). 



Fig. 4. CARCINTJS M^NAS. a, b. Successive forms of its 



metamorphosis 346 



Fig. 5. BALANUS. a. Male. b. Larva 393 



Fig. 6. LEPAS. a, b. Stages of its metamorphosis . . 395 



Fig. 7. LAGUNCULA REPENS 412 



Fig. 8. FLUSTRA HISPIDA 422 



Fig. 9. ALCYONIDIUM GELATmosuM 427 



Fig. 10. BTJGTJLA AVICULARIA 



The three smaller figures exhibit the 

 " Bird's-heads " in different states of expan- 

 sion 437 



