PLATE II. 
Crisia. 
Diam. Page 
Figure 1 . — Crisia eburnea, var. laxa, ..... 4 
la, part of the zoarium, front, . . . x 25 
„ 2. — Crisia cylindrica, ...... 7 
2a, lower portion of a young zoarium, . . x 25 
„ 3. — Crisia denticulata, ...... 4 
3a, front ; 3b, ooecium, . . . . x 25 
„ 4 . — Crisia cylindrica, ...... 7 
4a, older part of zoarium, front, . . x 25 
„ 5 . — Crisia conferta, ....... 7 
5a, part of the zoarium, with ocecium, . . x 25 
