PLATE XXY. 
Myriozoum. — Gemellipora. — Reteporella. — Retepora. 
Figure 1. — Myriozoum simplex , ....... 
la, magnified ; 1 c, orifice in the younger part ; Id, orifice in 
older part. 
,, 2. — Myriozoum honolulense, ...... 
2a, magnified ; 26, transverse section; 2c, lateral wall of zocecium. 
„ 3. — Gemellipora glabra, ....... 
3a, magnified ; 36, more highly magnified ; 3c, orifice and avicu- 
larium. 
■ ,, 4. — Myriozoum immersum, ...... 
4a, magnified ; 46, orifice ; 4c, orifice viewed from above ; 
Ad, transverse section. 
„ 5. — Reteporella Jlabellata, ...... 
5 a, magnified. 
,, 6. — Retepora apiculata, ....... 
6a, magnified ; 66, with ooecia ; 6c, more highly magnified. 
,, 7. — Retepora producta, ....... 
7a, magnified ; 76, 7c,7d, different views, more highly magnified ; 
7e, primary orifice ; 7f avicularium. 
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