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TEIBE III. MADREPORACEA. 
Family III.— PORITID^. 
Polyps closely crowded^ forming continuous porous coral se» 
cretions in their lower portions^ and not coralligenous towards 
the summits, — when expanded, therefore, prominent above the 
surface, and the coralla without calicles, with the cells shallow 
or superficial and scarcely traceable through the interior of the 
corallum. 
Genus I. — POBITES. — Cuvier. 
Polyps with 12 tentacles, and not exceeding a line in breadth ; 
zoophytes glomerate and furcato -ramose ; branches never neatly 
terete, obtuse at apex. Coralla throughout porous ; cells shal- 
low or superficial, radiately granulous within. 
Arrangement of the Species. 
A. Ramose, branches often compressed, but not plicate. 
I. Cells excavate. 
1. P. mordax. 
2. P. compressa. 
3. P. clavaria. 
4. P. flexuosa. 
ll. Cells superficial or none. 
5. P. furcata. 
6. P. recta. 
7. P. divaricata. 
8. P. nigrescensi 
9. P. palmata. 
B. Branches plicate. 
12. P. contigua. 
C. Glomerate or lobato-glomerate. 
I. Cells excavate. 
13. P. astraeoides. 
14. P. conglomerata. 
15. P. lobata. 
16. P. fragosa. 
II. Cells none. 
20. P. informis. 
21. P. erosa. 
10. P. levis, 
11. P. cylindrica. 
17. P. limosa. 
18. P. favosa. 
19. P. cribripora. 
22. P. monticulosa. 
