LICHENOPOEA. 
251 
sections ; X 13^ dia. Maastrichter Kalk : Maastricht. Van 
Breda Coll. 60,156b. 
Fig. 66. Part of a thin transverse section across the lower 
part of the same zoarium ; X 20 dia. 60,156b. 
Fig. 67, p. 252. The upper surface of a young zoarium, 4 mm. 
in diameter, in the suhcariosa stage ; the radial structure is only 
faintly indicated ; x 6 dia. Maastrichter Kalk : Maastricht. Van 
Breda Coll. D. 3454a. 
Fig. 68, p. 252. The upper surface of an older zoarium than 
Fig. 67, but still in the cariosa stage, attached to the same 
specimen as that shown in Fig. 67 ; X 6 dia. Maastrichter Kalk : 
Maastricht. Van Breda Coll. D. 3454b. 
Fig. 65. — Lichenopora. stellata. Thin Fig. 66. — Lichenopora stellata. Thin 
vertical section ; X 13|. 60,156b. horizontal section ; x 20. 60,156b. 
Fig. 69, p. 253. Side view of a zoarium in the suhcariosa 
stage; x6dia. It consists of four confluent colonies. Maastrichter 
Kalk : Maastricht. Van Breda Coll. D. 3445. 
Fig. 70, p. 253. View of the upper surface of the same 
specimen ; X 6 dia. D. 3445. 
Fig. 71, p. 254. Side view of another compound zoarium, of 
which the constituent colonies are in the cariosa and suhcariosa 
stages; X 5-| dia. Maastrichter Kalk: Maastricht. Van Breda 
Coll. D. 3446. 
Fig. 72, p. 254. Upper surface of the same specimen; X 5|-dia. 
The colony on the right-hand side of the specimen is in the suhcariosa 
stage ; the colony on the left is in the cariosa stage. D. 3446. 
