PLATE XL VI. 



FIGS. 



1-4. Styelopsis grossularia (Van Ben.) Traust. (p. 129) 

 1. A group : natural size. 2. A single indi- 

 vidual from this group : twice natural size. 3. 

 An individual, probably a variety of this species, 

 with a young one attached : three times natural 

 size. 4. The same : natural size. 

 5. Stt/elopsis glomerata (Alder), (p. 134) A cluster : 

 natural size. 



6-8. Thylacium aggreyatum (Kathke) V. Cams. (p. 

 136) 6. A group : one-half natural size. 7. 

 A single individual : natural size. 8. A group, 

 probably a variety of this species, of the size 

 and form of var. maculatum, but apparently not 

 spotted : natural size. 



9-11. Thylacium Sylvani V. Cams. (p. 137) 9. A 

 group of small ones. 10. A group of rather 

 larger ones. 11. A single individual, much 

 larger. All with young ones attached ; and 

 natural size. 



12-14. Thylacium variolosum (G-aertn.). (p. 138) 12. 

 A mass : twice natural size. 13. Showing 

 mode of growth on an Ascidian (?) : natural size. 

 14. A larva : magnified. 



15 and 16. Pelonaia corrugataFoYb. & Goods, (p. 145) 15. 

 Test : natural size. 16. Part of branchial sac : 

 magnified. 



