PLATE XXIV. 
[Unless otherwise stated, all the figures on this plate are copied from Hall, Nat. ITist. New York, Pal 
II, 1852.] 
NicholsoneUaflorida (Hall). (Page 38.) 
[See also PI. XIV, figs. 10, 11.1 
Figs. 1, 2. Zoaria enlarged and natural size respectively. In upper half of fig. 1 the flora 
form apertures are shown while a species of Lioclema incrusts a portion of 
the lower half. 
Rochester shale, Lockport, N. Y. 
Eridotrypa striata (Hall). (Page 32.) 
[See also PI. XII, figs. 4-6; PI. XXV, fig. 11.] 
3, 4. Enlarged and natural-size views of the basal part, of a zoarium. 
5. A portion of fig. 3 enlarged to show the striated appearance of the zocecil 
toward the base. 
6. A fragment of a zoarium, natural size. 
Rochester shale, Lockport , N. Y. 
Acanthoclema asperum (Hall). (Page 58;) 
(See also PI. XXI, figs. 3-5; PI. XXV, figs. 17-20.] 
7, 8. Three fragments of zoaria, natural size. 
9. A portion of fig. 7 enlarged, showing the numerous small aeanthopores indent- 
ing the elongate-oval zocecia. 
Rochester shale, Lockport, N. Y. 
BatostomeUa granulifera (Hall). (Page 28.) 
[See also PI. XIII, figs. 1-5; PI. XXV, figs. 11, 12.1 
10. Fragment of a zoarium, natural size, showing the usual growth. 
11. Surface of a fragment, enlarged. 
Rochester shale, Lockport, N, Y. 
Bythopora sjrinulosa (Hall). (Page~29.) 
[See also PI. XIII, figs. 0, 7.1 
12. A fragment, natural size, rather more robust than usual. 
13. Surface of same enlarged, showing the sharp spines. 
Rochester shale, Lockport, N. Y. 
Lioclema asperum (Hall). (Page 32.) 
[See also PI. XI. figs. 1-3. J 
14. An undulating expansion of this species, natural size. 
15, 16. Two enlargements of the surface, exhibiting the numerous mesopores and 
large aeanthopores. 
Rochester shale, Lockport, N. Y. 
116 
