ZONOPOEA. 
427 
Diagnosis. 
Torcbellariid^e with a screw-shaped stem, with the zooecia 
opening- on a spiral ridge separated by a broad spiral band of 
dactylethrae. 
The zooecia grow from the axis of the branches, and are not 
developed in laminm. 
Type Species. 
Ceriopora spiralis, Goldfuss, 1827. Petref. Germ. vol. i. p. 36, 
pi. xi. fig. 2. jMaastrichter Kreide : ^Maastricht. 
Affinities. 
For this genus the name of Spiroclausa has generally been 
adopted, which is unfortunate, since Zonopora has four years’ 
priority. Zonopora was founded on this species, which is therefore 
necessarily the type. 
Zonopora is allied to Terebellaria by the screw-shaped zoarium 
and spiral band of dactylethrae ; but it has not the laminar, 
acropetal gTowth of the Jurassic genus. 
1. Zonopora spiralis (Goldfuss), 1827. 
Synontmyx 
Millejjorite en colonne torse, Faujas St. Fond, 1799. Mont St. Pierre, p. 192, 
pi. XXXY. figs. 9, 10. 
Ceriopora spiralis, Goldfuss, 1827. Petref. Germ. toI. i. p. 36, pi. xi. fig. 2. 
Morren, 1829. Cor. Belg. : Ann. Accad. Groning. 1828, 
p. 41. 
von Hagenow, 1846. In Geinitz, Grundr. Verst, vol. ii. 
p. 599. 
d’Orbigny, 1849. Gen. nouv. Bry. : Eev. Mag. Zool. ser. 2, 
vol. i. p. 503. 
d’Orbigny, 1850. Prod. Pal. vol. ii. p. 267. 
pars, von Hagenow, 1851. Bry. Maastr. Kr. p. 22, j)l. iii. 
figs. 9a, h, e, f \ non c, d, g-l. 
d’Orbigny, 1853-4. Biy. Cret. p. 883, pi. 764, figs. 1-5. 
pars, Winlder, 1864. Mus. Teyl. : Cat. Pal. livr. ii. p. 212. 
Hamm, 1881. Bry. mastr. Ob. -Sen. p. 29. 
Ubaglis, 1888. Compl. Bend. Exc. : Bull. Soc. beige GeoL 
vol. i., Mem. p. 233. 
Pergens, 1890. Bevision, p. 354. 
Zonopora elegans, d’Orbigny, 1850. Prod. Pal. vol. ii. p. 267. 
5? ? J 
Zonopora ,, 
Terebellaria , , 
Spiroclausa ,, 
55 55 
5 5 5 5 
5 5 5 5 
5 5 5 5 
