Van Name. — Simple Ascidians. 
Fig. 
98. 
Fig. 
99. 
Fig. 
100. 
Fig. 
101. 
Fig. 
102. 
Fig. 
103. 
PLATE 61. 
Tethyum mortenseni Hartmeyer. Part of branchial sac. X 15. 
Tethijum mortenseni Hartmeyer. Dorsal tubercle. X 26. 
Tethyum mortenseni Hartmeyer. Gonad as seen from side next to 
branchial sac. X 20. 
Tethyum finmarkiense {Kiaer). Part of branchial sac. X 15. 
Tethyum finmarJciense (Kiaer). Dorsal tubercle. X 12. 
Tethyum finmarkiense (Kiaer). Gonad as seen from side next to 
mantle. X 15. 
