PLATE III. 
Figs. 1-7. — Monocaulus imperator (p. 5). 
Fig. 1. — The liydranth and gonophores, with the distal portion of the stem ; natural 
size. 
Fig. 2. — The proximal end of the stem ; natural size. 
Fig. 3. — One of the branching peduncles of the gonosome with its clusters of gonophores ; 
magnified about 15 diameters. 
Fig. 4. — A portion of a transverse section of the wall of the stem ; magnified about 
12 diameters, and slightly diagrammatic. 
a. Ectoderm. 
b. Elastic tissue of the stem. 
c. Endoderm. 
d. Longitudinal canals of the endoderm. 
Fig. 5. — Portion of stem seen from the outer surface after maceration ; magnified 50 
diameters. 
a. Elastic tissue partly denuded of the ectoderm. 
h. Some of the ectoderm cells still adhering to the outer surface of the elastic tissue. 
Fig. 6. — Some of the fibres of the elastic coat breaking up into finer fibrillse ; magnified 
100 diameters. 
Fig. 7. — Outline of a transverse section of the stem, showing the manner in which the 
walls are thrown into folds by the action of the elastic coat ; slightly enlarged. 
