PLATE XXIV . 1 
Turritigera. — Reteporella. — Bifaxaria. — Haswellia, &c. 
Figure 1 a . — Turritigera stellcita, ...... 
1b, orifice with columnar processes; lc, 1 e, avicularia; Id, 
dorsal opening with young Crinoid issuing from it ; If, 
orifice with avicularian process ; 1 g, hack view. 
„ 2a . — Reteporella myriozoides, ...... 
2b, magnified ; 2c, orifice and avicularium. 
„ 3a . — Bifaxaria denticulata, ...... 
3b, magnified ; 3c, avicularia. 
„ 4a . — Bifaxaria papillata (PL XIII. fig. 4), 
4b, 4c, magnified ; 4 d, showing papilliform avicularium. 
„ 5a . — Bifaxaria abyssicola, ...... 
5b, magnified ; 5c, 5 d, lateral aspect ; 5 e, transverse section of 
the zoarium, showing the position of the zooecia and 
avicularia. 
„ 6 . — Bifaxaria corrugata, showing papilliform avicularia (PI. XIII. 
% 3 ), 
„ 7a . — Tubucellaria opuntioides* (PL XXXVI. fig. 19). 
7b, magnified ; 7c, orifice, more highly magnified. 
„ 8a, 8b . — Tessaradoma boreale, ...... 
8c, magnified ; 8 d, more highly magnified ; 8 e, showing median 
pore with Rotalina attached. 
„ 9a . — Haswellia australiensis, ...... 
9b, magnified ; 9c, 9 d, 9f, 9g, orifices at various stages ; 9 h, 
transverse section. 
„ 10a. — Has'ivellia auricidata* ...... 
10b, 10c, older part of zoarium and orifices; 10 d, ocecium ; 
10 e, primary orifice with emarginate lower border. 
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1 The species thus marked (*) have been re-named since the plate was printed off. 
