22 
spond with the real zooecia, which are very narrow and elongated. 
Endotoichal ooecia seated in the superior part of an area but in 
the inferior part of a zooecium ^). Every distal wall is provided with 
a sing'le rosette-plate with several pores and every lateral wall 
with two^). 
Chlidoniidae, Every row of zooecia of the fan-shaped colony 
of Chlidonia terminates in 3—4 siender cylindrical internodes and 
new zooecia gradually rise by a transformation of these (internodes), 
which in the same colony can take place in two different ways. 
In some cases such an internode seems to he transformed into a 
zooecium by a gradual dilatation, while in others a cup-shaped 
growth of the same form as the basal part of a zooecium is for¬ 
med under the internode. In both these singular instances of a 
postembryonal metamorphose, which for lack of sufficient rnaterial 
I have not been able to study at full length, a resorption must take 
M G. M. R. Levinsen, Op. cit. PI. II, fig. 19, o. 
0 Melicerita dubia Busk (Challenger, Zoology, Vol. X, P. 1, pag. 97, PI. 
XXXIII, fig. 10), which I refer to a new genus {Membranicellaria) 
and a new family {Memhrmiicellariidae), differs from the Cellariidae 
only by the possession of a membranous area and an opercular 
valve. The ooecia have been overlooked by Busk. To this family, 
whose members no doubt must be considered the ancestors of the 
Cellariidae, I think the following cretaceous Bryozoa must be referred: 
Eschara Aceste d’Orb. (Op. cit. PI. 662), E. Achates d’Orb. (PI. 662), 
E. Ægea d’Orb. (PI. 663), E. Amata d’Orb. (PI. 665), E. Calypso 
d’Orb. fPl. 669), E. cymodoce d’Orb. (PI. 674), E. Danae d’Orb. (PI. 
675), Bifliistra rhomboidalis d’Orb. (PI. 691), B. mæandrina d’Orb. 
(PI. 695), Eschara striata Goldf. (Hagenow, Die Bryozoen d. Maast- 
richter Kreidebildung, Cassel, 1851, Tab. VIII, 6—7), E. i'hombea Hag. 
(Op. cit, Tab. VIII, 8) and Biflustra PraBålci Novåk, (Beitrag z. Kennt- 
niss d. Bryozoen d. Bohmischen Kreid eformation, Taf. III, 20—25, 
Denkschriften d. Kais. Akad. d. Wissenschaften, math.-natur, CL, 
XXXVII B). That B. Prazålci which according to Canu (Revision d. 
Bryozoaires du Crétacé, pag. 390, Bullet. Soc. Géol. de Erance, 3. S. 
T. 28, 1900) is identical with Onychocella Acis d’Orb. belongs to this 
family is evident from the figures 21, 22 and 25, clearly showing that 
the elongated, narrow zooecia do not correspond with the broad, hexa- 
gonal areas. Escharella argus (Waters, Annals nat. hist. 6 S., Vol. 
VIII, PI. VI, fig. 7) seems to belong to the Cellariidae. 
