“Oribrimorph”’ Cretaceous Polyzoa. 35 
ce. Keresrourns, subfam. uov. 
Tabular Diagnoses of Genera and Species. 
A. Coste fairly widely separate; proximal 
pair of apertural spines not greatly en- 
1 aes Ce ic cok ey ee .... I. Kelestoma. 
WOPASby INCEUSHIN Pe parva. os fe ss eros «eps 1. K. elongatum. 
Be Asty erect, Cylimaricnlicry ai tack, telssetsl oe 2. K. scalaris. 
B, Cost nearly touching; proximal pair of 
apertural spines enormously enlarged .... II. Morphasmopora. 
1. Avicularia, although involved in the 
proximal shield, are not raised on to it . 1. M. jukes-brownet. 
2. Avicularia raised high on the proximal 
SEO ery ctet ct pare eh. fort aisicha’s sas a 2, M. brydoner. 
It is possible that Membraniporella aurita, Hennig, 1892, 
Stud. Bry. Sver. Krit.; Act. Univ. Lundensis, Lunds Univ. 
Ars-skrift, vol. xxvii. p. 38, pl. 11. figs. 34-35 ; mucronatus- 
zone; Sweden ; is a Morphasmopora. 
I. Kextestoma, Marsson. 
Genotype. K. elongatum. 
1. K. elongatum, Marsson, 1887, Pal. Abh. vol. iv. Heft 1, 
p. 99, pl. x. 138; mucronatus-zone ; Rigen. 
2. K. scalaris, sp. n. 
Type-specimen. British Museum, D. 18006 ; mucronatus- 
zone; Riigen. 
II. MorpHasMopora, gen. nov. 
Genotype. M. jukes-brownei (Brydone). 
1. M. [Cribrilina] jukes-brownet (Brydone), 1906, Geol. 
Mag. dec. v. vol. ili. p. 297, text-fig. 9 on p. 298; 
mucronatus-zone ; Trimingham, Norfolk. 
2. M. brydonei, sp. n. 
Type-specimen. British Museum, D. 15122; mucronatus- 
zone; Riigen. 
d. TrrerpH4atoporin#, subfam. nov. 
Tabular Diagnoses of Genera. 
A, Secondary aperture, if present, built up in 
connection with two avicularia at the 
proximo-lateral corners of, or laterally 
