PLATE XIII. 
BlFAXARIA. ICHTHYARIA. 
PAGE 
Figure 1 . — Bifaxaria submucronata , . . . . . .80 
la, magnified. 
,, 2 . — Bifaxaria Icevis, ....... 80 
2a, magnified ; 2b, back view. 
,, 3. — Bifaxaria corrugata (PL XXIV. fig. 6), * . .80 
3a, magnified. 
„ 4 . — Bifaxaria papillata (PI. XXIV. fig. 4), . . .81 
4 a, magnified. 
„ 5 . — Bifaxaria minuta, . . . . . . .81 
5a, magnified. 
„ 6, 8 . — Bifaxaria reticulata, ...... 82 
6a, 8a, magnified ; 6b, portion of zooecial wall, more highly magnified. 
„ 7. — Iclithyaria oculata, . . . . . . .46 
7a, magnified; 7b, a single zooecium, more highly magnified; 
7c, back view. 
