PLATE XXVI. 
Retepora. 
Figure la. — Retepora denticulata, 
1 6, more highly magnified; lc, Id, avicularia. 
„ 2 a. — Retepora contortuplicata, ...... 
2 6 , more highly magnified. 
„ 3 a. — Retepora delicatula, ...... 
3b, 3c, more highly magnified ; 3d, mandible of fenestral avicu- 
larium. 
„ 4a. — Retepora hirsuta, . . . . . 
46, more highly magnified ; 4c, ooecium with trifoliate stigma ; 
4c£, 4e, avicularia ; 4f, 4 g, antenniform spines. 
,, 5a. — Retepora columnifera, ...... 
56, zocecia more highly magnified ; 5c, columnar avicularium ; 
5 d, 5e, fenestral avicularium and mandible. 
„ 6a. — Retepora mucronata, ...... 
66, zooecia more highly magnified ; 6c, orifices with pyramidal 
mucro ; 6d, ooecium. 
,, 7a. — Retepora gigantea, ...... 
76, 7c, avicularia. 
„ 86 . — Retepora cavernosa, . ... . 
8c, magnified ; 8 d, ooecia. 
„ 9a . — Retepora imperati, ...... 
96, zooecia, magnified ; 9c, ooecia ; 9 d, 9e, 9 f avicularia. 
10 . — Retepora crassa, ooecia (PI. XXVII. fig. 3), 
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