TROCHILIOPORA, THOLOPORA. 
267 
LIST OF SPECIMENS. 
D. 2995. The type-specimen. Upper Chalk. Gravesend. ? Bowerbank Coll. 
Figd. PI. III. Fig. 2. 
D. 2994. A zoarium -with broken stem. Upper Chalk. Gravesend. Bowerbank 
Coll. 
UNIIFPPESENTED SPECIES, 
clathrata (von Peuss), 1872-3. 
Syn. Liscosparsa clathrata^ von Beuss, 1872-3. Bry. unt. Quad. : Palaoontogr. 
vol. XX. pt. i. p. Ill, pi. xxvii. fig. 4. 
Deframia multiradiata, von Beuss, 1872-3. Op. cit. p. Ill, pi. xxvii. 
figs. 0 , 6. 
Char. — Zoaria simple, discoid, and conical ; they may be gregarious, and thus 
incidentally form compound zoaria. The upper smi'ace has a central depression 
lined with irregular, crowded zooecia. From this central group pass off radial 
or subradial series. In one specimen of B. multiradiata the zooecia are 
irregularly radial (von Beuss, op. cit. fig. 6 ; in fig. o the radial arrangement 
isAvell developed, and the aperture at the inner end of the series is the largest). 
Distrib. — Cenomanian — Lower Planer: Saxony (exact localities not stated). 
Aff. — Both forms included in this species are described as rare, and the 
L. clathrata was founded on a single specimen. The two forms are probably 
the same, but the radial arrangement of the zooecia is not so well shown in the 
clathrata as in the multiradiata of von Beuss. 
THOLOPORA, nov. gen. 
Synonyms. 
Ceriopora, pars, Goldfuss, 1827 ; Michelin, 1846 ; d’Orbigny, 1850. 
Radiopora, Simonowitsch, 1871. 
Stellipora, non Hall, 1843; pars, von Hagenow, 1851. 
JJomopora, d’Orbiguy, 1849, 1850, 1854; Hincks, 1880; pars. Vine, 1885. 
Lichenopora, pars, Pergens & Meunier, 1887 ; Hennig, 1894. 
Hetcropora, Novak, 1877 ; Pocta, 1892. 
Defrancia, von Beuss, 1847 ; pars, Vine, 1885. 
Diagnosis. 
Padioporidae in which the zoarium is compound, and consists 
of a series of superposed discs, or sub- colonies, forming short, 
thick, blunt, cylindrical stems. The zoarium may consist 
of one stem or of many stems rising from a broad incrusting 
base, forming a low tuft. 
Each sub-colony consists of a central area crowded with 
mesopores ; it is surrounded by a zone traversed by radial, 
uniserial rows of apertures, separated by lines of mesopores. 
Seen from the side the apertures occur in vertical series. 
