266 TEANSACTIONS LIVEEPOOL BIOLOGICAL SOCIETY. 



although it comes near to M. occulta, Kup., and perhaps 

 still more near to M. septentrionalis, Traust., from the 

 North of Europe. 



Fig. 3, PL XIV., shows the exterior, natural size; fig. 4 

 is the dorsal tubercle and neighbouring parts ; figs. 5 and 6 

 show the right and left sides of the body, with the test 

 removed; fig. 7 is a small part of the branchial sac from 

 the inside, magnified. 



Explanation of the Plates. 

 Plate XL 



Fig. 1. Corella willmericoia, n. sp., natural size, from 



left side. 

 Fig. 2. Alimentary and reproductive viscera, slightly 



enlarged. 

 Fig. 3. Part of the branchial sac, from inside, X 50. 

 Fig. 4. Tentacles, dorsal tubercle, and languets, X 50. 



Plate XII. 



Ascidiella griffini, n. sp., natural size. 

 Dorsal tubercle of same, X 50. 

 Part of branchial sac, X 50. 

 Ascidiella incrustans, n. sp., natural size. 

 Dorsal tubercle of same, X 50. 

 Part of branchial sac, X 50. 

 Cynthia villosa, Stimpson, natural size. 

 Same, with test removed. 

 Two of the spines from the test, enlarged. 

 Dorsal languets, X 50. 



Part of the branchial sac, showing the trans- 

 versely running stigmata, X 50 



Fig. 



1. 



Fig. 



2. 



Fig. 



3. 



Fig. 



4. 



Fig. 



5. 



Fig. 



6. 



Fig. 



7. 



Fig. 



8. 



Fig. 



9. 



Fig. 



10. 



Fig. 



11. 



