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HETEfiOPOKIDiE. 
Aff. — T his species corresponds in Multicrescis to H. surculacea in Heteropora ; 
in addition to the generic characters the two species differ by the raised rims of 
the apertures, which give H. ricordeana somewhat the aspect of a coral. 
7. spongioides (Miclielin), 1841. 
Syn. Heteropora spongioides, Michelin, 1841. Icon. Zooph. p. 3, pi. i. fig. 3. 
Folytrema ,, d’Orhigny, 1850. Trod. Pal. vol. ii. p. 143. 
Reptomulticrescis ,, d’Orbigny, 1854. Bry. Cret. p. 1079. 
Char. — Zoarium massive, nodular, with irregular upper surface. Apertures 
small. Mesopores uniserial. 
Distrib. — Alhian : Grandpre and Machcromeuil, Ardennes. 
Aff. — This species corresponds to H. tuberosa, hut with uniserial mesopores. 
BIFL ABELL ARIA, Pergens, 1894. 
[Nouv. Bry. Cret. Limb. : Bull. Soc. beige Geol. vol. vii., Mem. p. 172.] 
Diagnosis. 
Heteroporidse with a flabelliform zoarium, which consists of two 
layers on a median lamella. (The zooecia are said by Pergens 
to he dimorphic, and the smaller zooids agree with Heteropora 
and Lichenopora.) 
The zoarium has numerous piriform depressions occupied only 
by the mesopores. 
Type Species. 
B. apathyi, Pergens: op. cit. p. 172, pi. yiii. fig. 1. Senonian — 
Maastrichtian : Maastricht. 
Affinities. 
Allied to Heteropora^ but with a frondose or flabelliform zoarium 
and with the groups of mesopores in piriform depressions, 
corresponding to the ‘ maculae ’ of some Palaeozoic Trepostomata. 
TJNPEPRESENTED SPECIES, 
apathyi, Pergens, 1894. 
Syn. Biflahellaria apathyi, Pergens, 1894. Nouv. Bry. Cret. Limb. : Bull. Soc. 
beige Geol. vol. vii., Mem. p. 172, pi. viii. figs. 1, la. 
Char. — As in the genus. Zooecial apertures •12 mm. in diameter. Mesopores 
•06 to ^09 mm. in diameter. 
Distrib. — Senonian — Maastrichtian : Petit Lanaye and Mt. St. Pierre, 
Maastricht. 
