PLATE IV. 
Figs. 1, 2. FISTULIPORA sp p. 110 
1. An encrusting zoarium, x2. 2. Tangential section, x4. Morrow 
formation, Station 301. 
Figs. 3-5. STENOPORA TUBERCULATA Prout p. Ill 
3. A transverse section of a zoarium encrusting a fragment of 
Cystodictya, x4. 4. An encrusting zoarium, x2. 5. Tangen- 
tial section, x4. Morrow formation, Station 301. 
Fig. 6. STENOPORA sp p. 112 
6. A zoarium, x2. Brentwood limestone. Station 134. 
Figs. 7, 8. ANISOTRYPA sp : p. 112 
7. Tangential section, x4. 8. A zoarium, x4. Brentwood limestone. 
Station 134. 
Figs. 9-lOa. FENESTELLA VENUSTA n. sp p. 114 
9. Obverse face of a zoarium, x4. Morrow formation, Station 296. 
10. The zoarium selected as the holotype, reverse face. 10a. A por- 
tion of the same enlarged four diameters. Hale formation, 
Station 136. 
Figs. 11, 11a. FENESTELLA MORROWENSIS n. sp p. 115 
11. The type specimen, obverse face. 11a. A portion of the same, 
x4. Morrow formation, Station 301. 
Figs. 12, 12a. ARCHIMENDES JUVENIS n. sp p. 115 
12. The type shaft. 12a. Longitudinal section of the same. Brent- 
wood limestone. Station 153. 
Figs. 13-14. POLYPORA PURDUEI n. sp p. 118 
13. The type zoarium, obverse face. 13a. A portion of the same, x4. 
Hale formation. Station 136. 
14. Reverse face of another zoarium. Brentwood limestone. Station 
150. 
Figs, 15, 15a. POLYPORA WASHINGTONENSIS n. sp. p. 119 
15. A portion of the type zoarium, reverse face. 15a. Another por- 
tion of the same, ground and polished to give a tangential sec- 
tion near the obverse face, showing zooecial arrangement, x4. 
Brentwood limestone, Station 150. 
Figs, 16-17. POLYPORA CONSTRICTA n. sp .p. 120 
16. The fragment of a zoarium selected as the holotype, reverse face. 
16a. The same, obverse face. 16b. The obverse face enlarged 
four diameters. Morrow formation. Station 296. 
17. Reverse face of another zoarium, showing the deep funnel-shaped 
fenestrules which characterize the species. Morrow formation. 
Station 299. • 
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