EEPTOilULTICA-VA, DEFEAXCIOPOKA. 
153 
DEFRANCIOPORA, Hamm, 1881. 
[Bry. mastr. Ob. -Sen. i., Cycl. p. 39.] 
SrXONTMY. 
Defrancia, pars, von Hagenow, 1851. 
Domopora, pars, d’Orbigny, 1854; Vine, 1885. 
Ceriopora, pars, von Hagenow, 1851 ; Ubaghs, 1890. 
Multelea , pars , Beissel, 1865 ; Ubagbs, 1890. 
Diagnosis. 
Cerioporidae with a compound zoarium, formed of several saucer- 
shaped or discoid sub-colonies in a vertical series. 
The apertures cover the upper, outer rim of the sub-colonies ; 
the lower exposed surface of each sub-colony is covered by 
a calcareous layer (epizoarium). The zooecia on the upper 
surface are radially arranged around a central area of crowded 
apertures. 
Type Species. 
Befranciopora cochloidea (von Hagenow) : Bry. maastr. Kr. 
p. 42, pi. iv. fig. 8. Haastrichter Kalk : Maastricht. 
Affinities. 
This genus has the apertures crowded in narrow, horizontal 
bands around the zoarium. The zooecia are simple in structure, 
as is shown by PI. YII. Pig. 65, in which the apertures appear 
of the same nature, though the sizes vary according to the wearing 
down of the margin of the sub-colonies. 
Hamm placed the genus in his group the Ceriopora, and between 
the genera Zonatula and Inversaria. 
1. Befranciopora cochloidea (von Hagenow), 1851. 
Synonymy. 
Defrancia cochloidea, von Hagenow, 1851. Bry. maastr. Kr. p. 42, pi. iv. 
fig. 8. 
non Domopora ,, d’Orbigny, 1854. Bry. Cret. p. 990, pi. 781, figs. 5-7. 
,, {Defrancia) cochloidea, Vine, 1885. Fifth Eeport: Eep. Brit. 
Assoc. 1884, p. 151. 
Defranciopora cochloidea, Hamm, 1881. Bry. mastr. Ob. -Sen. i., Cycl. p. 39. 
Diagnosis. 
Zoarium cylindrical and annulated. It is built up of a vertical 
pile of bun-shaped segments, which are well rounded above 
and concave below. The apertures occur in oblique rows 
