“Oribrimorph” Cretaceous Polyzoa. 393 
Maastricht. = Replescharipora elegantula, Beissel, 1865, 
Bry. Aach. Kreid. p. 60, pl. vii. fig. 82 (non=C. ele- 
gantula, Hagenow, 1851, vide supra). = Cribrilina beis- 
seli, Brydone, 1909, Geol. Mag. dec. v. vol. vi. p. 399. 
12. P. [Cribrilina] subvitrea (Brydone), 1909, Geol. Mag. 
dec. v. vol. vi. p. 899, pl. xxii. figs. 3-4; mucronatus- 
zone; Trimingham, Norfolk. 
II. TrrLopHoporA, sp. n. 
Genotype. T. trifida, sp. n. Type-specimen. British 
Museum, D. 28229 ; Danian ; Faxe, Denmark. 
c. ScursTacaNTHOPORIN, subfam. nov. 
SCHISTACANTHOPORA, gen. Noy. 
Genotype. S. fissa,sp.n. Type-specimen. In the collection 
of M. Canu [a photograph of type-specimen in the British 
Museum) ; Maastrichtian ; Royan. 
C. Lagynoporide, fam. nov. 
Multiserial Cheilostome Polyzoa of moderate size (about 
2mm. long, seldom less than 4 mm. Jong), in which the 
intraterminal front wall is formed of costz which fuse along 
the middle line, but there are seldom obvious intercostal 
fusions and no free spines in the median area of fusion; a 
general solidification of the intraterminal front wall takes 
place during evolution by the widening of the median area 
of fusion, by the closer juxtaposition of the costz, and 
occasionally by definite intercostal fusions ; a secondary 
aperture may be formed by means of a proximal shield com- 
posed of fusions of the proximal pair of apertural spines 
with a median process of the apertural bar—otherwise the 
family is singularly free from secondary tissue; apertural 
spines 4-6, typically and primarily 6, reduced in some cases 
to 4; avicularia few, fairly large and blunt, with oval 
apertures, tending to disappear; a large, more or less 
distally placed communication-pore present. 
Tabular Diagnoses of the Subfamilies. 
A, A niedian process of the apertural bar present, 
which ultimately fuses with the proximal 
pair of apertural spines to form a proximal 
shield of a secondary aperture .......... »» a, Lagynoporine, 
