CiUSIA, ACTIXOPORA. 
5 
Liseopoi'fi, pars, AVoodward, 1833. 
Jje/rancia, pars, von Haj^enow, 1851. 
jRadiocavea, pars, d’Orbigny. 185-1. 
Pavotubigera, d’Orbigny, 1853. 
Uuitubigera, d’Orbigny, 1853. 
Radiotubigera, d’Orbigny, 1853. 
Discofttbigera, d’Orbigny, 1853. 
Reptopora, de Loriol, 1868. 
Liripora, pars, MacgilUvray, 1887. 
iJiscocavea, pars, ^larssou, 1888. 
Apsendesia, pars. Vine, 1893. 
Diagnosis!. 
Theonoidae in which the zoarium is a flat, simple, adnate disc. 
The apertures open on a series of ridges, which radiate from 
a central depression. There may he a flat peripheral selvage. 
Type Species. 
Actinopora stellata (Koch & Dunker), 1837. Neocomian: 
Germany. 
Affinities. 
The generic name, as here defined, has the following synonyms : — 
Farotuhigera ^ includes species in which the radial centre is ex- 
ceiitric in position ; Radiotuhigera those in which the apertures 
are uniserial ; Biscotuhigera,^ a series with biserial or triserial radii 
and slightly raised edges ; JJnituhigera ^ has very narrow uniserial 
rows, which are somewhat ill-defined. 
Reptopora, de Loriol,^ was founded on a species from the Swiss 
Valangiau which is allied to A. hrongniarti (M.-Edw.). Liripora, 
Macgillivray,® was founded for two recent species from Port Philip 
Heads, Victoria: the one species, L. lineata (Macg.), is an Actino- 
pora ; the other, Biastopora fasciculata (Macg.), belongs to a distinct 
genus. 
^ D’Orbigny, Bry. Cret. p. 766. 
- Ibid. p. 756. 
® Ibid. p. 757. 
^ Ibid. p. 759. 
= De Loriol. Valaug. Arzier. : Mat. Pal. Suisse, ser. 4, pt. ii. (1868), p. 63. 
® Macgillivray. Descr. New Polyz. pt. xii. : Trans. Eoy. Soc, Viet. vol. xxiii. 
(1887), p. 182. Cat. Mar, Polyz. Viet. : ibid. p. 218. On Biastopora lineata, 
Macg. : Descr. New Polyz. pt. vii, ibid. vol. xxi. (1885), p. 96, pi. iii. fig, 1 ; 
on B. fasciculata'. ibid. p. 97, pi. hi. fig. 2, 
