PERIPOKA. 
269 
from the P. h'geriensis subsequently defined, and a synonym of" 
P. pseuclospiralisj which is therefore the type of the genus. 
Affinities. 
The multiserial apertures distinguish this genus from such 
genera as Spiropora, in which the zocecia open in single series. 
Peripora pseudospiralis (Michelin), 184o. 
SrNONYilY. 
Pustulipora pseudospiralis, Miclielin, 1845. Icon. Zooph. p. 212, pi. liii. fig. G. 
Zonopora 
d’Orbigny, 1850. Prod. Pal. vol. ii. p. 177. 
Peripora 
d’Orbigny, 1851-3. Bjy. Cret. p. 703, pi. 616, 
figs. 6-8. 
,, 
Pergens, 1890. Pevision, p. 366. 
? J 
pars, Canii, 1898. Bry. St. Cal. : Bull. Soc. geol. Fr. 
ser. 3, vol. xx. p. 746. 
Spiro})ora 
(jlomerata, 
d’Orbiguy, 1850. Xouv. Bry. cret. : Bev. Mag. ZooL 
ser. 2, vol. ii. p. 109. 
d’Orbiguy, 1850. Prod. Pal. vol. ii. p. 176. 
Peripora 
lujeriensisy 
d’Orbigny, 1850. Ibid. vol. ii. p. 266. 
,, 
d’Orbiguy, 1851. Bry. Cret. pi. 616, figs. 9-11. 
>> 
pars, d’Orbigny, 1853. Ibid. p. 704, pi. 74 v 
figs. 11-13. 
von lleuss, 1872-3. Bry. unt. Quad. : Paltcontogr. 
vol. XX. pt. 1, p. 119, pi. xxix. fig. 10. 
Eschar lies 
distans, 
pars, von Ilagenow, 1851. Bry. Maastr. Kr. p. 56, 
pi. i. figs. \%a-e, g, k, m ; non figs. 16/, h, i, /, 
and fig. 17. 
>> 
pars, Pergens «S: Meunier, 1887. Bry. gar. Faxe : 
Ann. Soc. roy. mal. Belg. vol. xxi., Mem. p. 206. 
Diagnosis. 
Zoarium of thin, cylindiical, dichotomous branches. 
Apertures in spiral or verticillate rows of from two to four, 
usually three. The apertures are placed in a regular 
quincunx, or irregularly in the lower thick parts of the 
branches. 
Internodes shorter than the zones in the distal parts of the 
zoarium, hut may he longer below. 
Distribution. 
? Danian : Faxoe. 
Senonian — Maastrichtian : Meudon ; Petit Lanaye. 
Santonian: Pons, Perignac, etc., Cliarente-Infeiieure. 
