PLATE VII. 
Figs. 1-5. — Halecium cymiforme (p. 15). 
Fig. 1. — A colony growing over the stems and branches of some other dendritic Hydroid ; 
natural size. 
Fig. 2. — Portion of a colony ; magnified 20 diameters. 
Fig. 3. — Outline of portion of a colony near its base, showing the fascicled basal tubes and 
the origin of the free portion of the colony; magnified about 15 diameters. 
Fig. 4. — Young gonangium (male ?) with its contents ; magnified about 60 diameters. 
a. Blastostyle. 
b. Sporosac. 
c. Ectodermal investment of the sporosac, sent off from the walls of the blastostyle. 
d. Inner layer of the cap-like covering of the sporosac. 
e. Outer layer of same. 
Fig. 5. — More mature gonangium (male?) with its contents ; magnified about 40 diameters. 
a. Blastostyle. 
b. Sporosac. 
c. Ectodermal investment of the sporosac, sent off from the walls of the blastostyle. The 
structures forming the cap of the sporosac have here disappeared. 
