Van Name.^ — Simple Ascidians. 
PLATE 68. 
Fig. 135. Tethyum atlanticum, sp. nov. Two groups of individuals. Sta- 
tion 940 (N. lat. 39° 54', W. long. 09° 51' 30", 134 fathoms). 
Nat. size. 
Fig. 136. Tethyum plicatum (Lesueur). Four individuals. Fort Macon, 
N. C. Nat. size. 
