176 
CERIOPORIDJS. 
is provisionally left as an appendix to the Cerioporidae ; this con- 
clusion is supported by the description and figures of C. ostrupi 
from the Swedish Chalk given by Hennig, as the characters he 
delineates are those of Bryozoa rather than Hydrozoa. 
The species vary in the shape of the zoarium, the distribution 
of the apertures, and the development of the ridges. 
Canalipora constricta (Romer), 1840. 
Synonymy. 
Cericpora stellafa, PGoldfuss, von Hagenow, 1839. Mon. Riig. : N. Jahrb. 
p. 285. 
,, ,, von Hagenow, 1840. Ibid. pt. ii. : ibid. p. 647. 
,, tuberosa, von Hagenow, 1840. Ibid. p. 639. 
,, constricta.^ Romer, 1840. Verst, nordd. Kr. p. 23. 
,, strangulata, Marsson, 1887. Bry. Riig. : Pal. Abh. vol. iv. pt. i. p. 44, 
pi. iv. fig. 4. 
Diagnosis. 
Cylindrical stems that are sometimes branched or give off blunt 
lobes. The stems are marked by irregular constrictions. 
Surface apparently smooth, so that the apertures appear to 
open flush with the surface instead of between ridges. 
Apertures quincuncial or in curved series, and in places 
irregular ; angular, and rhombic to hexagonal. The apertures 
along the constrictions are smaller than on the rest of 
the stem. 
Normal apertures about *0.5 mm. in dia. 
Distribution. 
Senonian — Campanian : Riigen. 
Affinities. 
Marsson’s and Rdmer’s names are synonymous, as they were 
both founded on von Hagenow’s C. stellata, Hag. {non Goldf.), 
which von Hagenow subsequently renamed C. tuherosa. Marsson 
renamed it Ceriopora strangulata on the ground that the name 
C. tuherosa had been preoccupied in 1839 by Romer, and gave 
as reference “ Yersteinerungen des norddeutschen Oolithgebirges, 
t. 14, fig. 17.” But there is no such figure. The name tuherosa 
was given by Romer to two species, an Alveolites tuherosa (Verst, 
nordd. Oolithgeb., Nachtrag, p. 14, pi. xvii. fig. 9), which, in 1840 
(Verst, nordd. Kreidegeb. p. 23), he transferred to Ceriopora ; it 
