PLATE XXII. 



I'IGS. 



1-8. Ciona fasciciilaris Hanc. (p. 15) 1. A cluster : 

 three-fifths natural size. 2. Test, showing- 

 mantle within it : slightly enlarged. 3. Test 

 laid open, showing mantle more clearly : slightly 

 enlarged. 4. Mantle, with the test removed : 

 slightly enlarged, v. " Ovary not developed." 

 5.: Mantle laid open, showing branchial sac, 

 etc. : slightly enlarged. 6. Atrial aperture of 

 man tie, with siphon extended: three times natural 

 size. 7. Atrial aperture of mantle, with siphon 

 retracted : three times natural size. 8. Part 

 of branchial sac with oral tentacles : magnified. 

 9. Corella larvfeformis Hanc. (p. 28) Test, show- 

 ing mantle within it : twice natural size. 



10 and 11. Corella orata Hanc. (p. 31) 10. Test, showing- 

 mantle within it: twice natural size. 11. 

 Ati-ial aperture of mantle : magnified. 



