PLATE XXVIII. 1 
Retepora. — Cellepora. — Chlidonia. 
Figure 1 . — Retepora atlantica * ....... 
la, magnified ; lb, ooecium. 
„ 2 . — Retepora tubulata, . . . 
2a, 2b, magnified. 
„ 3. — Retepora te.ssellata, var. pubens, ..... 
3a, magnified ; 3b, 3c, avicularia. 
„ 4 . — Retepora simplex. ..... 
4a, magnified. 
,, 5. — Cellepora ovalis (PI. XXXV. fig. 6), . 
5a, magnified. 
„ 6 . — Cellepora asperci (PI. XXXV. fig. 2), .... 
6a, magnified ; 6b, avicularium. 
„ 7. — Cellepora rudis (PI. XXXVI. fig. 7), . 
7a, magnified; 7b, ooecium; 7c, avicularium. 
„ 8 . — Cellepora pustulata, ....... 
8a, orifice ; 2 8 b, orifice with avicularia ; 8c, magnified ; 8 d, avicu- 
larium. 
„ 9 . — Cellepora tubercidata (PI. XXXV. fig. 7), 
9a, magnified. 
„ 10 . — Cellepora conica, also (PI. XXXVI. fig. 1), # . 
10a, orifice; 106, avicularium; 10c, ooecium; 10c?, avicularium. 
„ 11 . — Chlidonia cordieri, . ...... 
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8 
1 The species thus marked (*) have been re-named since the plate was printed off. 
2 8a is the bottom left-hand figure. 
