190 
HETEROPORID^. 
D. 6340. Two stems of the var. tenera (on slide). Maastrichter Kalk. 
St. Pierre, Maastricht. Busk Coll. Presented by Miss Busk. 
D. 6364. A zoarium, 12 mm. high ; bilobed above, where it is 10 mm. wide. 
The smallest part of the stem is 6 mm. wide, except at the base, 
which is 5 mm. wide. (On slide.) The apertures are mostly 
crowded, but in places are scattered, as in von Hagenow’s figure 
(Bry. maastr. Kr. pi. v. fig. 6c). Labelled Ceriopora cryptopora by 
Busk. Maastrichter Kalk. Fauquemont {?). Busk Coll. Presented 
by Miss Busk. 
D. 6365. A nodular zoarium (on slide). Maastrichter Kalk. Fauquemont. 
Labelled Ceriopora cryptopora. Characters similar to D, 6364. 
Busk Coll. Presented by Miss Busk. 
2. Heteropora keeping!, Gregory, 1909. 
Synonymy. 
Ceriopora michelini, d’Orbigny, 1850. Prod. Pal. vol. ii. p. 143. 
Multicrescis ,, pars, d’Orbigny, 1854. Bry. Cret. p. 1075, pi. 799, 
figs. 14, 15. 
„ ,, Etheridge A Xewton, 1878. Cat. Cret. Foss. Mus. 
Pract. Geol. p. 7. 
Heteropora {Multicrescis) michelini, pars, Keeping, 18S3. Foss. Xeoc. Upware, 
p. 141. 
,, ,, michelini, Pergens, 1890. Ilev. p. 373. 
,, keepingi, Gregory, 1909. Xew Cret. Bry. : Geol. Mag. dec. v. 
vol. vi. p. 64. 
Diagnosis. 
Zoarium tufted, rising from a thick base, giving off above thick, 
finger-shaped, simple branches, or knobby branches, which 
may divide irregularly ; branches end bluntly. 
Mesopores uniserial, or sometimes biserial. 
Dimensions. 
Height of zoarium ... 
B.M. D. 7292. 
mm. 
50 
B. 118. 
mm. 
23 
Thickness of branches 
9 ' ... 
5-8 
Diameter of apertures 
•15 
•15 
Distance between centres of apertures 
•3--4 
•3--4 
Xumber of apertures per sq. mm. 
9-10 
12 
Distribution. 
British : 
Lower Greensand : Brickhill, Upware ? 
( Jide Keeping) ; 
Co.xwell 
Farringdon, Berkshire ; ? Isle of Wight. 
Foreign : 
Albian: Grandpre, Ardennes. 
