Van Name. — Simple Ascidians. 
PLATE 54. 
Fig. 58. Caesira singularis, sp. nov. 
mantle. X 14. 
Caesira singularis, sp. nov. 
Caesira singularis, sp. nov. 
Pyura echinata (Linnaeus). 
Pyura echinata (Linnaeus). 
Pyura echinata (Linnaeus). 
Pyura echinata (Linnaeus). 
Fig. 65. Pyura echinata (Linnaeus). 
Fig. 
59. 
Fig. 
60, 
Fig. 
6L 
Fig. 
62. 
Fig. 
63. 
Fig. 
64. 
Right gonad as seen from side next to 
Dorsal tubercle. X 14. 
Oral tentacles. X 11. 
Dorsal tubercle. X 14. 
Oral tentacles. X 8. 
Left gonad. X 8. 
Part of branchial sac. X 12. 
Spinous processes of body. X 9. 
