“Oribrimorph” Cretaceous Polyzoa. 103 
a. Proximal apertural spines are often still 
visible and sometimes the distal pair as 
WOM wcceg eat: 2. See Seiad bala 20. P. brydonet. 
b. Proximal apertural spines (except in nean- 
astic stages) entirely swamped by secon- 
dary tissue, also (except in neanastic 
stages) the distal pair, which are re- 
placed by a pair of avicularia. 
1. Avicularia minute, though they may be 
somewhat lengthened .........+.... 21. P. bidens. 
2. Avicularia stout, short, and peg-like ; 
coste 15-18. 
Pra MUBLCKUBEEIE 12) Sele eieds atone eskleevvoanes Lo, £. Mmarsuprorunm. 
B= Breet, unilaminar =|... 122s sli Los -L. Tocdeanensts. 
3. Avicularia long and hardly flattened. 
a. Costz about 15-20. 
1. Length about i mm. 
dn MeCrustine, oo.) ..< Btu a Hee the heds) o4e Ly. Ganicconens?s. 
6. Unilaminar, erect ...,.. wecececees 20. LP. lancingensis: 
2, Length less than 1 mm.; outermost 
intercostal perforations less slot-like. 
a. Incrusting. 
a, Less secondary intereecial tissue .. 26. P. saltdeanensis. 
B. More secondary intercecial tissue .. 27. P. colliwm. 
Or Vntlaminar; cree | ic. 6 e:eres 5 ne ois va 28. P. promontoriorum. 
B. Coste about 12-15; outermost inter- 
costal perforations circular; length 
considerably less than 1 mm. 
is Incrusting.. 221i. 24). SNaRGL ah Bea sats sre 29. P. ranunculoides. 
Pee MAIMITVAT CLO CL eral cieis ose sie <<) . 80. P. lacuum. 
y. Coste 10; otherwise as 8; incrusting . 31. P. gyrinoides. 
4, Avicularia flattened and broad distally, 
amd tend) foqmifarcate! “site eiclac's ole tos 32. P. somptingensis. 
5. Avicularia very broad distally and dis- 
tinctly bilobed. 
PeemOURICE IS AET DES aye 2 ad o's) nie ole a's olin Slam oly ore 33. P. gregory?. 
B. Erect, unilaminar ...... cieaoteis 1 .... 4. P. palmata. 
y. Erect, bilaminar....... S eeaeherercaiere Si, « 35. P. damicornis. 
1. P. calceata, sp. un. 
Type-specimen. British Museum, D. 4032; Lower Seno- 
nian; Chatham, Kent. 
2. P. crepidaria, sp. n. 
Type-specimen. British Museum, D. 21200 ; coranguinum- 
zone ; Wooburn Green, Bucks. 
3. P. solearis, sp. n. 
Type-specimen. British Museum, D. 21211 ; coranguinum- 
zone; Hurley Bottom, Berks. 
4, P. [ Semiescharipora] interrupta (VOrbigny), Pal. Frang. 
1552, pl. 719. figs. 5-8, 1853, p. 487; Senonian ; 
