228 
ZONATTJLID^. 
Affinities. 
This genus differs from Multi%onop(yra by the structure of the 
zoarium not being multilamellar ; the apertures tend to occur in 
elliptical or circular raised groups instead of in bands. 
1. Plethopora verrucosa, von Hagenow, 1851. 
Synonymy. 
Plethopora verrucosa, von Hagenow, 1851. Bry. maastr. Kr. p. 45, pi. v. fig. 10. 
,, ,, Winkler, 1864. Musee Teyl., Cat. Pal. livr. ii. p. 208. 
,, ,, XJbaghs, 1867. Descr. Geol. Pal. Limb. p. 226. 
Fasciculipora prolifera, pars, Hamm, 1881. Bry. mastr. Ob. -Sen. i., Cycl. 
p. 35. 
Pledopora truncata, von Hagenow, 1850. In Geinitz, Quadersandsteingeb. p. 242. 
Plethopora ,, von Hagenow, 1851. Bry. maastr. Kr. p. 46, pi. v. fig. 11. 
,, ,, Winkler, 1864. Musee Teyl., Cat. Pal. livr. ii. p. 208. 
,, ,, Ubaghs, 1879. Descr. Geol. Pal. Limb. p. 226. 
Corymhosa ,, d’Orbigny, 1853. Bry. Cret. p. 690. 
Plethopora verrucosa, pars, d’Orbigny, 1854. Bry. Cret. p. 1045. 
Ceriopora vihicata, von Hagenow, 1846. In Geinitz, Grundr. Verst, vol. ii. 
p. 599, pi. xxiiiB, fig. 17. 
Plethopora ,, von Hagenow, 1851. Bry. maastr. Kr. p. 45. 
,, von Hagenow, 1851. Ihid. 
,, malmi, Hennig, 1894. Bry. Sver. Krit. ii., Cycl. : Lunds Univ. 
Arsskrift, vol. xxx., Acta Physiogr. Xo. viii. p. 31, 
pi. ii. fig. 30, and fig. 19, p. 31. 
Diagnosis. 
Zoarium of thick, short, simple stems, which may bifurcate into 
lobe-like branches. The groups of apertures 'are circular, or 
elliptical, or sometimes occur as irregular bands. 
Dimensions. 
Von Hagenow’s Hennig’s 
type. 
P. malmi. 
mm. 
mm. 
Height of zoarium 
17 
15 
Diameter of zoarium 
4-5 
2-5 
Diameter of tufts 
2 V 
... 1-5-2 
Diameter of apertures 
-1 
... '06--1 
Diameter of mesopores 
-06 
— 
Distribution. 
Senonian — Maastrichtian : Maastricht ; Falkenberg. 
Campanian — Zone of Beletnnitella mucronata (beds with Actino- 
camax mamillatus) : Balsberg and Oppmanna, Sweden. 
Affinities. 
This species is the type of genus. D’Orbigny at first placed 
P. truncata in the genus Corymhosa. The P. malmi of Hennig 
