Fig, i. 
Fig. 2. 
PLATE XVL 
Figs. 1-5. LONCHOTASTER TARTAREUS, 
Abactinal aspect ; magnified 14 diameters. 
Actinal aspect ; magnified 14 diameters. 
Profile view ; magnified 2 diameters. 
A portion of the abactinal surface ; magnified 20 diameters. 
Adambulacral and infero-marginal plates; magnified 10 diameters. 
