“Cribrimorph” Cretaceous Polyzoa. 93 
4, P. obstructa, sp. n. 
Type-specimen. British Museum, D. 21183; coranguinum- 
zone ; Wooburn Green, Bucks. 
f. Casranoporinaz, subfam. nov. 
Tabular Diagnoses of the Genera. 
A. No secondary front wall formed. 
I. Ring of secondary aperture incomplete. 
a, Proximal shield,.if present, formed by the 
flattening of the apertural bar. 
1, Smaller. 
de teO AVICWATIA, 2 ht A Le in bes I, Anornithopora. 
8. Avicularia pointing in various direc- 
EXT oe Rs Mone Pha EA een AF Il. Carydiopora. 
2. Larger, avicularia of two kinds, (1) di- 
rected distally and (2) directed proxi- 
mally (the latter kind may be very 
rare or absent)....... eC ee II. Castanopora. 
3. Larger, avicularia (if present) of one 
kind only, proximally directed...... IV. Rhiniopora. 
6. Proximal shield formed by the ends of 
the apertural bar produced upwards, 
fusing and making a hoop over the 
APPELUTAE DARL, 15 thea s\aeide> oa: «be « V. Phrynopora. 
II. Ring of secondary aperture complete. 
a. Coste finer, apertural ring solid........ VI. Hesperopora. 
b. Coste coarser, apertural ring with large 
BBEIGEATIONS 2 Vos Acie cone wissen el saae & VII. Stichocados. 
B. A secondary front wall (lamina peristomica 
of Jullien). 
I, Secondary front wall formed by the expan- 
sion of branched apertural spines and ? of 
APORbREAl AVICUIATIA Yo) c:2/5°5 g.c'eeie ie Sojses eo = VIL. Ubaghsia. 
II. Secondary front wall formed by the expan- 
sions of a pair of apertural avicularia. 
PapbECe by MNMAMINAE ss 5% ails 6 cies o/s ose IX. Steginopora. 
Peebireer, PUATHIRAT: 95. 0. Ss ids 3» abso ble X. Disteginopora. 
I. ANORNITHOPORA, gen. nov. 
Genotype. A. imvolucris. 
Tabular Diagnoses of the Species. 
A. Costz about 17 ; intraterminal front wall less 
consolidated ; apertural spines4........., 1, A. involucris. 
B, Coste about 10-12; intraterminal front wall 
more consolidated ; apertural spines 5 or6 . 2. A. irrostrata. 
1. A. involucris, sp. n. 
Type-specimen, British Museum, D. 28111; quadratus- 
zone, [ guadratus-subzone| ; N.E. of Worthing, Sussex. 
