ZONATULA. 
219 
3. laevigata (d’Orbigny), 1850. 
Syn. Zonopora Icevigata, d’Orbigny, 1850. Prod. Pal. vol. ii. p. 141. 
M ,, d’Orbigny, 1853. Bry. Cret. p. 931, pi. 771, figs. 7, 8. 
Char. — Zoarium flabellate, with branches on one plane, but not anastomosing. 
The branches are from 4 to 6 mm. in diameter. Apertures arranged in 
irregular, alternate bands. 
Distrib.— Albian : Grandpre and Sance-au-Bois, Ardennes. 
4. Pvariabilis (d’Orbigny), 1853. 
Syx. Zonopora varinhiUs, d’Orbigny, 1853. Bry. Cret. p. 931, pi. 771, 
non ,, 
i 9 
figs. 9-13. 
PVine, 1890. Polyz. Red Chalk: Quart. 
Journ. 
non ,, 
Geol. Soc. vol. xlvi. p. 482. 
PViue, 1891. Microz. Red Chalk: Proc. 
Yorks. 
Heteropora 
„ 
Geol. Soc. vol. xi. p. 384. 
Pergens, 1890. Rev. p. 374. 
Char. — Zoarium of thin branches, 2-3 mm. in diameter, which are dichotomous 
and do not anastomose. The branches are often very short and irregular. 
Apertures “ of very ii-regular groups, more or less transverse.” Mesopores, 
including half the walls, -12 mm, in diameter. Zooecia *16 mm. in diameter. 
Distrib. — Senonian — Maastrichtian : Royan, Charente-Inferieure. 
Santonian: Saintes, Charente-Inferieure. 
Coniacian : Lavardin and Villavard, Loir-et-Cher ; Tours, 
Indre-et-Loire. 
6. undata (d’Orbigny), 1853. 
Syn. Zonopora undata, d’Orbigny, 1853. Bry. Cret. p, 932, pi. 771, figs. 14, 15. 
non ,, ,, Vine, 1891. Rep. Cret. Polyz, : Rep, Brit. Assoc. 1890, 
p. 384. 
Jlcteropora ,, Pergens, 1890. Rev. p. 374. 
,, ,, Vine, 1893. Compl. Rep.: Rep, Brit. Assoc. 1892, 
p. 332. 
,, undalata, Pergens, 1893. Bry. St. Pat. : Bull. Soc. beige 
Geol. vol. vi., Pr. Verb. p. 208. 
Char. — Zoarium of dichotomous, non-anastomosing branches, 4 mm. in diameter. 
They have irregular, alternate, transverse elevations, on which the apertures 
are grouped. The zoarium has, therefore, a somewhat wavy surface. Apertures, 
internal diameter, •12 mm. Mesopores, including half the walls, *12 mm. in 
diameter. 
Distrib. — Senonian : Bougniaux ; St. Leger ; Peguillac and Perignac, in 
C har ente - 1 nf er i eur e . 
Atf. — Vine has identified several specimens from the Red Chalk as this species. 
The specimens are small fragments ; some of them appear to me quite inde- 
terminable ; they are recorded under Zonatula favus, to which they probably 
belong, B. 2663, B. 2665. 
