Van Name. — Simple Ascidians. 
PLATE 58. 
Fig. 84. Pelonaia corrugata Goodsir and Forbes. Part of branchial sac. 
X26. 
Fig. 85. Pelonaia corrugata Goodsir and Forbes. Small part of gonad as 
seen from side next to mantle. X 26. 
Fig. 86. Tethyum coriaceum (Wdev and Hsmcock). Dorsal tubercle. X 15. 
Fig. 87. Tethyum coriaceum (Alder and Hancock). Part of branchial sac. 
X20. 
Fig. 88. Tethyum coriaceum (Alder and Hancock). Right gonad as seen 
from side lying against branchial sac. X 5. 
