282 
BADIOPORID^. 
Affinities. 
This species is based on specimens from the Chalk of Kent, 
some of which had been identified as Multicrescis variahilis ; the 
records of that species in Vine’s published reports, however, refer 
to other species from the Lower Greensand and Red Chalk. The 
species is allied to Tholopora clavata by its cylindrical constricted 
stem ; but in T. cantiana the zoarium is smaller and the con- 
strictions are much deeper, the number of apertures in a restricted 
series is smaller, and the zoarium tapers upward to a blunt point. 
LIST OF SPECIMENS. 
L. 2759. The type-specimen (on slide). Middle Chalk — zone of Micraster 
cortestiidinarium. Chatham. Vine Coll. Figd. PI. VIII. Fig. 3. 
D. 2849. A paratype (on slide). Upper Chalk. Bromlev, Kent. J. Simmons 
CoU. Figd. PI. VIII. Fig. 2. 
D. 4208. Three zoaria (on slide). Middle Chalk— zone of Micraster cor- 
testudinarium. Chatham. Gamble Coll. 
D. 715. A zoarium (on slide), labelled variabilis. Middle Chalk — 
zone of Micraster cortestudinarium. Chatham. Vine Coll. 
(No. 67, 28 G). 
D. 410. A specimen with flattened upper surface. Middle Chalk — zone of 
Micraster cortestudinarium. Chatham. Gamble Coll. 
RADIOPORA, d’Orbigny, 1849. 
[Gen. nouv. Bry. : Eev. Mag. Zool. ser. 2, vol. i. 1849, p. 502.] 
Synonyms. 
Ceriopora, pars, Goldfuss, 1827 ; Michelin, 1846 ; von Hagenow, 1846 ; Kade, 
1852; etc. 
Heteropora, pars, Homer, 1839, 1840. 
Polytrema, pars, d’Orbigny, 1850. 
Stellipora {non Hall, 1843), von Hagenow, 1851 ; Winkler,' 1864. 
Semimulticavea, d’Orbigny, 1854; Keeping, 1883. 
Lichenopora, pars, Pergens, 1890 ; Hennig, 1894. 
Bomopora, pars, d’Orbigny, 1854; Ubaghs, 1879; Hamm, 1881. 
Diagnosis. 
Radioporidae with a massive zoarium which is multilamellar 
in structure. The zooecia are arranged in radial series; the 
rows are uniserial, and are separated by wide areas of 
mesopores. The radial arrangement is sometimes obscure. 
