PLATE I. 
Figs. 1-2. ZAPHRENTIS GIBSONI White p. 89 
I, la. Two views of a nearly complete specimen showing the primary 
and alar septa. 2. Transverse section of another individual 
in the immature region, x2. Morrow formation, Station 296. 
Figs. 3-5. CLADOCHONUS FRAGILIS n. sp p. 98 
3, 4, and 5. Three fragments of a corallum, cotypes, x4. Morrow 
formation. Station 301. 
Fig. 6. AULOPORA sp p. 98 
6. The only specimen, attached to a fragment of a Cystodictya, x4. 
Morrow formation. Station 301. 
Figs. 7-10. AMPLEXUS CORRUGATES n. sp p. 90 
7. A nearly complete specimen of a mature individual. 8. The 
holotype. 8a. Longitudinal section of the same. 9. A trans- 
vers section of another individual. Brentwood limestone. Sta- 
tion 210. 
10. A youthful individual which has retained a few of the spines 
which assisted in attaching it at the base. Morrow formation, 
Station 296. 
Figs. 11-13. LOPHOPHYLLUM PROFUNDUM (M.-E. & H.) p. 91 
II. A transverse section not far below the bottom of the calyx. 12. 
A transverse section in the immature region, x2, 13. A nearly 
complete individual. Morrow formation. Station 301. 
Figs. 14, 14a. CAMPOPHYLLUM TORQUIUM (Owen) p. 93 
14. A typical specimen. 14a. Transverse section of the same. 
Brentwood limestone. Station 145. 
Figs. 15-16. PACHYPORA CARBONARIA n. sp p. 94 
15. The individual selected as the holotype. 15a. Longitudinal sec- 
tion of the same. Morrow formation. Station 296. 
16. A corrallum of medium size. Brentwood limestone, Station 145. 
Figs. 17, 17a. MICHELINIA EUGENEAE White p. 95 
17. A small corallum, displaying the wrinkled epitheca which covers 
the basal portion. 17a. Longitudinal section of the same, 
showing the thick walls and thin tabulae which characterize 
the species. Morrow formation, Station 301. 
Fig. 18. MICHELINIA SUBCYLINDRICA n. sp p. 97 
18. One of the cotypes. Morrow formation, Station 301. 
252 
