PLATE XXXII. 
Figs. 1, la, lb, 1 c. — Thuiaria cupressina (p. 67). 
Fig. 1. — A colony ; natural size. 
Fig. la . — A portion of a pinna; magnified 30 diameters. 
Fig. lb . — Part of the main stem with the origin of a pinna ; magnified 15 diameters. 
Fig. lc. — Outline of part of a pinna near its origin, showing its mode of bifurcation; 
magnified 15 diameters. 
Figs. 2, 2 a. — Thuiaria vincta (p. 68). 
Fig. 2. — Part of a colony ; natural size. 
Fig. 2 a . — Part of a colony deprived of its coenosarc by maceration in caustic potash, 
showing the chitinous bands by which the hydrothecse of opposite sides are 
connected to one another ; magnified 1 5 diameters. 
