8 
THEONOID^, 
Fokeign. 
D. 3774. A zoarium (on slide). Maastrichter Kalk. Maastricht. Gamble 
Coll. This specimen was identified by M. Pergens as Apsendesxa 
disticha ; its rays, however, are short and triangular, and since the 
apertures are triserial at the end it is an A. hrom/niarti. 
2. Actinopora disticha (von Hagenow), 1851. 
Synoin'ymt. 
Defrancia disticha^ von Hagenow, 1851. Bry. maastr. Kr. p. 42, pi. iv. fig. 1. 
,, ,, Schliiter, 1870. Eeise slidl. Schwed. : X. Jahrb. 18/0, 
p. 940. 
,, ,, Marssou, 1887. Bry. Kiig. : Pal. Ahh. vol. iv. p. 39. 
Actinopora ,, d’Orhigny, 1853. Bry. Cret. p. 763. 
,, ,, Hamm, 1881. Bry. mastr. Ob. -Sen. i., Cycl. p. 27. 
Lichenopora ,, Winkler, 1864. Musee Teyl., Cat. Pal. IBt. ii. p. 212. 
,, ,, IJbaghs, 1879. Descr. Geol. Pal. Limbourg, p. 225. 
Apsendesia disticha, 'E.emiig, Bry. Sver. Krit. ii., Cycl. : Lunds Univ. 
Arsskrift, vol. xxx., Acta Physiogr. No. viii. p. 32. 
Actinopora g aiidr yn a, 1851. Bry. Cret. pi. 644, figs. 1-4. 
,, ,, d’Orbigny, 1853. Ibid. p. 765, pi. 752, figs. 1-3. 
Lichenopora gaudryana, Winkler, 1864. Op. cit. p. 225. 
Defrancia ,, pars, Bucaille, 1890. Bry. Cret. Seine-Inf. : Bull. Soc. 
Sci. nat. Eouen, vol. xxv. p. 509. 
Apsendesia ,, Vine, 1893. Compl. Eep. : Eep. Brit. Assoc. 1892, 
pp. 322, 323. 
Defrancia excavata, d’Orbigny, 1851. Bry. Cret. pi. 644, figs. 5-8. 
,, ,, Ubaghs, 1858. Neue Bry. Maestr. : Pal. vol. v. p. 128. 
,, pnlchella, d’Orbigny, 1851. Bry. Cret. pi. 644, figs. 9-12. 
,, brongniarti {non Edw.), d’Orbigny, 1851. Ibid. figs. 13-15. 
Discotubigera santonensis, d’Orbigny, 1853. Ibid. p. 758, pi. 751, figs. 12-16. 
Davotubigera flabellata, d’Orbigny, 1853. Ibid. p. 767, pi. 752, figs. 4-8. 
,, , cf. ,, Peron, 1888. Craie S.E. Bass. Anglo-Par. ; Bull. Soc. 
Sci. nat. Tonne, vol. xli. pp. 225, 343, pi. iii.^fig. 24. 
,, ,, Canu, 1900. Geol. Eomorantin : Bull. Soc. geol. France, 
ser. 3, vol. xxviii. p. 103. 
,, ,, Canu, 1900. Bry. Toui's : C.E. Assoc, fran/;. Av. Sci. 
1899, p. 410. 
^Lichenopora cretacea, Defrance, 1823. Lichenopore : Diet. Sci. nat. vol. xxvi. 
p. 257. 
Diagnosis. 
Zoarium circular and flat ; the rays radiate from the centre or 
from a central depression, or in yar. flahellata the radial point 
is strongly excentric. The peripheral selvage is usually 
narrow, hut broad in var. regularis. 
