188 
EETECAVA. 
on R. lichenoides^ Goldf., though at a later period he referred that 
species to Idmonea^ and used Reteporidea differently.^ Hence, as 
explained subsequently, it is better to retain Retecava than 
Reteporidea. 
Retecava is perhaps the most specialized genus of Idmoniidae. 
1. Retecava clathrata (Goldfuss), 1827. 
Petepora clathrata, Goldfuss, 1827. Petref. Germ. p. 29, pi. ix. figs. r2<?, d, 
non a, b, e, f. 
Morren, 1829. Cor. foss. Belg. : Ann. Acc. Groning. 1828, 
p. 35. 
Edwards, 1836. In Lamark, Hist. Nat. Anim. sans Vert., 
2nd ed., p. 282. 
d’Orbigny, 1850. Prod. Pal. vol. ii. p. 264. 
von Hagenow, 1851. Bry. Maastr. Kr. p. 27, pi. ii. fig. 2. 
Kade, 1852. Los. Verst. Schanzenb. p. 31. 
d’Orbigny, 1853-4. Bry. Cret. p. 1026, pi, 790, figs, 5-9. 
Winkler, 1864. Musee Teyl. : Cat. Pal. livr. ii. p. 209. 
Hamm, 1881. Bry. mastr. Ob. -Sen. p. 32. 
Ubaghs, 1888. Compt. Rend. Exc. ; Bull. Soc. beige 
Geol. vol. i., Mem. p. 233. 
Pergens, 1890. Revision, p. 356. 
Pergens, 1894, Nouv, Bry. Limb. : Bull. Soc. beige Geol. 
vol. vii., Mem. p. 173. 
Reticulipora ramosa,^^ Orhigny , 1850. Prod. Pal. vol. ii. p. 265. 
,, ,, d’Orbiguy, 1851. Bry. Cret. pi. 610, figs. 7-11. 
? Idmonea verriculata, von Hagenow, 1851. Bry. Maastr. Kr. p. 28, pi. ii. fig. 5. 
? Neuropora cretacea, von Hagenow, 1851. Ibid. p. 48, pi. iii. fig. 10 {Jide 
Pergens) . 
Diagnosis. 
Zoarium forming a network which is fairly flat. The meshes 
are very irregular, varying from elliptical to oblong, trape- 
zoidal, or irregular. The reverse surface is fairly rounded ; 
the obverse surface is strongly carinate ; with a median 
zoarial lamina, separating the two lateral series of crowded 
zooecia. 
Zooecia of medium size ; the apertures open in curved transverse 
series of from six to eight in a series. Below the apertures 
the sides of the branches are covered by an epitheca, the surface 
Reticulipora ,, 
Idmonea ,, 
Retecava ,, 
>> >» 
yy yy 
I Ibid. p. 936. 
