“Cribrimorph” Cretaceous Polyzoa. 403 
IJ. Anoropora, gen. noy. 
Genotype. 4. inaurita, sp. np. Type-specimen, British 
Museum, D. 21789; Cenomanian, Chalk Marl; Cam- 
bridge. 
III. Ovrorora, gen. nov. 
Genotype. O. auricula, sp. un.  Type-specimen. British 
Museum, D. 23044; Cenomanian, Chalk Marl; Cambridge. 
IF’. Ctenoporide, fam. nov. 
Multiserial Cheilostome Polyzoa with uniserial early 
stages whose intraterminal front wall is furnished with very 
thin cylindrical costz, arched over and hardly fused or very 
slightly fused in the middle line and with no lateral fusions, 
but the coste are firmly fused beneath to a ground-tissue 
that forms a solid arched intraterminal front wall; apertural 
bar imperfectly formed (that is, the two costee of which it 
is composed overlap and the subsequent fusion does not 
hide this to form a bilaterally symmetrical apertural bar) ; 
apertural spines small, four in number; avicularia generally 
a pair to each aperture, small and blunt ; no secondary 
interceecial tissue or secondary apertures. 
Crenopora, gen. nov. 
Genotype, C. pecten, sp. n. Type-specimen. British 
Museum, D. 21691 ; Cenomanian, Chalk Marl ; Cambridge. 
G. Calpidoporide, fam. nov. 
Multiserial Cheilostome Polyzoa of fair size (about ~ mm. 
in length), of which the intraterminal front wail is not “much 
arched and is composed of stout, flattish, parallel-sided 
costee of unequal thickness, widely separate efecrally but 
firmly fused in the middle line; the apertural bar has a 
median projection, which may be flattened into a proximal 
shield; there is much intercecial secondary tissue ; avicularia 
small to moderate-sized, more or less pointed. 
Tabular Diagnoses of the Genera. 
A. Median area of fusion comparatively narrow ; 
avicularia sharp. 
I, Avicularia paired, situated laterally rather 
than proximally with regard to the aperture. [. Calpidopora. 
