202 
EETECAVA. 
D. 6423. Four fragments (on slide). Maastrichter Kreide. Ileer. BuskCtdI. 
D. 6425. Fifteen fragments (on slide). Maastrichter Kreide. St. Fiern . 
Busk Coll. 
7. Retecava cancellata (Goldfuss), 1829. 
Synonymy. 
Relepora cancellata, Goldfuss, 1829. Petref. Germ. vol. i. p. 103, pi. xxxvi. 
,, 
99 
fig. 17. 
Morren, 1829. Cor. foss. Belg. : Ann. Acc. Groniug. 1828, 
5) 
99 
p . Oi * 
M. Ed\vard.«, 1836. In Lamarck, Hist. nat. .Vnim. f^an-k 
99 
Vert., 2nd ed., vol. ii. p. 282. 
von Ilageuow, 1839. Mon. Kiig. : Xcu. Jalirb. 1839, 
>> 
9 9 
p. 281. 
von Ilagenow, 1846. In Geinitz, Grundr. Verst, p. 590, 
non Idmonea 
9 9 
pi. xxiii. b, fig. 2. 
von Reuss, 1847. Foss. Polyp "NVieu, : Xaturw. Abli, 
Idmonea 
99 
vol. ii. p. 46, pi. V. figs. 25-27 ; pi. vi. fig. 33. 
von Ilagenow, 1851. Brv. Maastr. Kr. p. 29, pi. ii. 
fig. 7. 
Kade, 1852. Los. Verst. Schaiizenb. p. 31. 
> > 
9 9 
d’Orbigny, 1853. Bry. Cret. p. 739. pi. 748, figs. 20-23. 
9 9 
Winkler, 1864. Mus. Teyl. : Cat. Pal. livr. ii. p. 213. 
nO)iyj 
99 
Manzoni, 1878. Brioz. Mioc. Austr. : Denk. Akad. Wiss. 
non.j 
99 
Wien. vol. xxxviii. pt. 2, p. 7, pi. v. fig. 18. 
Segueuza, 1880. Formaz. terz. Regg. : Atti R. Acc. Line. 
99 
ser. 3, Mem. vol. vi. p. 85. 
Hamm, 1881. Bry. mastr. Ob. -Sen. p. 32. 
99 
pars, Pergens &: Meunier, 1886. Bry. gar. Faxe : Ann. 
J 9 
99 
Soc. mal. Beige, vol. xxi. p. 214. 
pars, Pergens, 1890. Revision, p. 350. 
Reteporidea 
99 
d’Orbigny, 1850. Prod. Pal. vol. ii. p. 264. 
Cri&idmonea 
„ 
Marsson, 1887. Bry. Riig. : Pal. Abb. vol. iv. p. 30. 
Idmonea hagenowiy Rdmer, 1840. Verst, nordd. Kr. p. 20. 
Diagnosis. 
Zoarium of laterally compressed branches, which arc laterally 
free or united into lattice-work hj’ small dissepiments which 
hear no apertures. The zooecia are loosely united, so that the 
surface appears porous. The rex'erse surface is marked by 
faint linear depressions. The reverse axis is but little broader 
than the obverse part of the branches. 
Zooecia in transx’ersc rows of from three to five. The rows of 
apertures extend for half the thickness of the branches. 
